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Dozens of archivers today are popular today, and in the description of each program you can find that its algorithm is the most-most ... I decided to take several popular archivers in the network, namely: WinRar, Winuha, Winzip, KGB Archiver, 7Z and check them in "Combat "Conditions.

Small preface ... Comparison may not be too objective. Comparison of Achivators was carried out on the usual home computerMiddle in terms of indicators today. Besides not taken different types Data: Compress compression was carried out on the usual "Vordvsky" document, for many who have to learn or work with them - can accumulate great amount. Well, it is logical that the information that rarely use is to take advantage of the archive and sometimes extract. Yes, and transmit such a file is much easier: and the flash drive will be copied faster than a lot of small files, and the Internet is faster than the Internet ...

Compression Comparison Table

For a small experiment was taken relatively large file RTF. - About 3.5 MB and compressed with different archivers. The time of work is not yet, the features of the programs will be described further, now just let's see the degree of compression.

As can be seen from a small plate that the highest compression ratio is achieved by the KGB Archiver 2 program - the initial file size of the file has decreased by 23 times! Those. If you have several gigabytes on your hard disk, which you do not use and want to remove (but does not leave the feeling, but suddenly it is useful) - is it not easier to squeeze such a program and write to the disk ...

But about all the "pitfalls" in order ...

KGB Archiver 2.

In general, it is not a bad archiver, according to developers, their compression algorithm is one of the most "strong". It is difficult to disagree ...

Only here the compression speed leaves much to be desired. For example, a file in the example (about 3 MB) program has been compressed about 3 minutes! It is easy to estimate that one CD disk it will compress half a day, if not more.

But a special surprise causes this. Unpacking the file last time as much as compression! Those. If you spent half a day to compress part of your documents, then the same time you spend to get them from the archive.

Outcome: The program can be used for small amounts of information, especially when the minimum size of the source file is important (for example, the file must be placed on a diskette, or on a small flash drive). But again, guessing the size of the compressed file can not be guess, and perhaps the time for compression you spend invested ...

WinRar

The famous program in the post-Soviet space is installed on most computers. Probably, if she did not show such good results, she would not have so many fans. Below the screenshot on which the compression settings are shown, nothing special, unless the compression ratio was put to the maximum.

Surprising WinRar squeezed the file in a few seconds, and the file size decreased by 17 times. A very worthy result, if you still consider that the time spent on processing is negligible. And the time for unpacking the file is even less!

Outcome: excellent programshowing one of the best results. In the process of compression settings, you can also specify maximum size Archive and the program will break it into several parts. It is very convenient to transfer the file from one computer to another on the flash drive or CD / DVD disk when the entire file is not written to the ...

Winuha.

Relatively young archiver. It is impossible to call it over-popular, but many users have interest to him who often work with archives - there. And it's not by chance, because according to the statements of the developers of the archiver, its compression algorithm is stronger than RAR and 7Z.

In our small experiment, I would not say that it is. It is possible that on some other data it will show where the best results ...

By the way, when installing, choose English, in Russian - the program issues "krajakosabra".

Outcome: A good program with an interesting compression algorithm. Time for processing and creating an archive, of course, more than winrar, but on some types of data you can get a little more compression. Although, personally, I would not do a big accent on this ...

7z.

Very popular free archiver. Many claim that the compression ratio of 7z is even better implemented than in WinRar. It is possible, but when compressed with the level of "ultra" on most files, it loses WinRar.

Outcome: Not bad alternative to WinRar. Quite comparable compression ratio good support Russian language, convenient embedding in the context menu of the conductor.

Winzip.

Legendary, one of the most popular once archives. On the network, probably the most frequently found archives is "zip". And it's not by chance - because despite not the highest degree of compression, the speed of work is simply striking. For example, Windows opens such archives as ordinary folders!

In addition, it should not be forgotten that this archiver and compression format is much older than new-fashioned competitors. Yes, and not everyone has powerful computers now, which will allow you to quickly work with new formats. And Zip format supports all modern archivers!

Hello, dear blog readers Website. I am often asked what archivatory-quality compresses the data and for what criteria it needs to be chosen. Reply which archiver is better compressing I can not, but I will take a small test, where it will be seen which archiver has the greatest compression ratio for different files.

The WinRAR archiver has proven itself as the best archiver on the Internet. However, his minus is that it is conditionally free (Shareware). After installing on a computer, it will work as licensed software For 40 days.

When this term is over, a message will appear that you need to buy a license for software. Fortunately, this window can be simply closed and use the program as usual.

The developers of this program suggest that after this period, if you don't like the program, you will remove it or refuse to further use. The most interesting thing is that after the specified forty days, no limitations are superimposed on the program.

The 7-ZIP program is used by a smaller number of users. This is explained by the fact that it is designed later by WinRar, although it is not inferior in quality. Probably users just do not want to bother with learning new program. The first issue of 7- Zip occurred in 1999, and WinRar in 1995. Plus 7-zip is that the program is distributed as a free software product.

So today I will write a small report on the experiment. It all started with the fact that I took different files and squeezed them with two most popular archivers: WinRar and 7-Zip, often found on computer computers.

After archiving, I watched the degree of compression of these files, based on which, gave an estimate to each archival.

Files that have been exposed to archiving is: text Document with pictures, pDF file., music, video and installation file. Chose them on a simple principle - it took what the most commonly found on the computer.

Usually, paid and free software is characterized by the number of functions and the quality of the tasks assigned to it. Just in this article we will find out which archiver squeezes the information better.

For clarity, I copied all the files into one folder. WinRAR compression method chose "maximum", and at 7-ZIP "Ultra". Screenshot, which I made after the entire procedure, see below.

As I said above, to determine the winner, I compared the sizes of compressed files. Where the size turned out less, this and plus. After that, it turned out a table to which you can see below.

As you can see, the score turned out 0: 5 in favor of the archiver 7 - Zip. To be honest, I myself did not expect 7 - Zip will win all the files.

For those who want to establish an archiver of 7 - Zip, I give a link of the developer site, there you can download the latest version of the archiver. Just download the archiver 7 - Zip, you can from my blog for a direct link.

In order to accurately make sure of the victory of 7 - Zip, I archived all the pre-archiving files into one common archive, and again he won. Screenshot see below.

So here is a visual way, I answered users questions about what archiver is better compressing. I used for a long time winRar programBut after that, the test additionally installed 7- ZIP. I think, in the case when it is necessary to squeeze information as much as possible, it will be useful for me.

Each program has its advantages and disadvantages, it is also necessary to understand that archivers may differ in functional and intuitive interface. The choice of which program is to use on your computer, remains yours. The most proven way to select programs is to install them on your computer.

Soon I will publish an interesting article, so I do not say goodbye to you.
P.S. For the very beginning, watch the video:

Sysadmin (he is on english language sysadmin., system Administrator) - Abbreviated name of the profession, the full name of which in Russian sounds like system Administrator. This profession has recently become very popular for most young, and not so, people, she is trained, they work on it, they receive good money for it. This is connected with the rapid development of various computer technology And their penetration into all spheres of human life. The word sysadmin is often used in spoken speech, in vacancies and resumes when looking for work, in one word - everywhere. Below will be discussed by the profession system administrator.

In modern realities, the system administrator can be called actually any person who is engaged in servicing and maintaining a certain work computer network, including all its hardware and / or software componentsin which may be:

• Personal computers such as workstations and servers;
• Network equipment, such as switches, routers, firewalls and much more;
• Web Servers, Mail Servers, Database Servers, and Other.

Also in certain cases, on the shoulders of the system administrator can lie the obligations to ensure proper information security.

Depending on its specialization, the system administrator can engage in the following activities:

• The administrator of workstations and servers is most often maintained as hardware (failed motherboards, chanting power supplies) and software (Windows not loaded, the commas are not printed in Word "E ...).
• Administrator corporate network Based on a domain Active Directory. Very popular occupation, given the prevalence of operational sIS. more windows, as well as the need for them somehow centrally controlled. Such a specialist should be able to create, distribute in groups, edit users, give them the appropriate rights in the AD domain, as well as be able to manage group politicians For users, their computers and groups in which they are all consist.
• Administration of networks and network equipment. Its responsibilities include knowledge topology of networks, the ability to work with both not customizable and with customizable network equipment, local planning computing network, as well as the possibility of combining into one network of several jobs distant from each other, by setting up NAT "OV and VPN" s. It is not necessary to forget the access and control of access within this network, and beyond the proxy setting.
• The web server administrator, which should at least be able to install, customize and serve one of the following web servers - Apache, IIS, Nginx, follow the hosting (which can be located both within the organization's network and outside it). In addition, a good administrator should be able to customize the normal distribution of resources at high loads, clustering and many other specific things.
• Administration mail Server The same is the common task for the sysadmin, its task includes working with such popular solutions such as Exim, Microsoft Exchange, PostFix, Sendmail, or corporate mail solutions from Google or, for example, Yandex. In addition to obvious control of accounts (creation, deletion, configuration), it is also necessary to be able to configure the antispam system and so on.
• Site administrator. These duties can include as simply some filling of the contents of the site, but since it is about the system administrator, then in theory it should be able to be able to configure hosting (including a web server, which has already been mentioned above), install and configure The desired site, such as any content management system (CMS).
• The task of creating or maintaining a video surveillance system may become quite rarely for the obligations of the system administrator. In tasks, installing and configuring cameras, responding to various events, saving and playing records. Refers to system administration weakly, and often falls into its duties on part-time to any other duties.

Overboard the system administrator class described above, such possible things as administrative databases (Microsoft SQL, MySQL and its multiple branches, Oracle, etc.), 1C administration (not to be confused with "Programmer 1C"), PBX and much more .

class \u003d "Eliadunit"\u003e

Often B. everyday life There is a need to compress files for the convenience of storing them, records for carriers and operational exchange through social networks, e-mail , file sharing and other services in global Network The Internet. However, not all files are equally well amenable to compression. Best shrink files text format (TXT, DOC). Archive Files (RAR, ZIP, 7Z, LHA, TAR, GZ, JAR, etc.), Video (AVI, MPEG, WMV, FLV), Music (MP3, WMA, AAC) and images (JPEG, JPG, GIF , PNG) slightly decrease in size, since it is originally files of compressed formats. These include files Microsoft Office. With DOCX, XLSX extensions.

Compression (reduction of size) files are engaged in specialized archiving programs, the most famous of which is WinRar, 7zip and WinZip. About how to squeeze the file in the WinRar archiver, we will talk.

To start packing files to the archive, it is necessary to make on your computer installed archiver WinRar . To start compression operation (archiving) you need to highlight the files you are going to compress. Then right-click on the selected area, call the context menu in which you select the string " Add to archive…».

In the working window that appears " The name and parameters of the archive»On the tab" General"We specify the name of the future archive, as well as select the format and the compression method. From the formats, we advise you to choose a publicly available Zip format, since some operating systems hardly read RAR format. In the drop-down menu " Compression method»We choose accordingly" Maximum" Press the OK button.

But the best effect should be expected from " Maximum»Compression methods together by a check mark" Create continuous archive».

Plus continuous archiving - This is an enlarged compression ratio.

Minuses:
• adding one file to this archive will occur a slower relative conventional archive;
• extract of one or more files will also occur more slowly;
• if any file is damaged in the continuous archive, it will not be possible to remove part of the files.

Based on the advantages and minuses, continuous archives are recommended Use in three cases:
• the archive will rarely update or not planned to update at all;
• the archive will be used to unpack it entirely,
• and the third case, when the compression ratio is more important than the speed of archiving and unpacking.

To set its own compression parameters for the RAR format, go to the Optional tab and click on the Compression Settings button in the NTFS Parameters. In a new dialog box, you can choose special parameters for text compression, audio and full color graphics, select the main compression algorithm, etc.

For add new file In the already available archive with maximum compression, you must open this archive and select in the menu " Teams»Row" Add file to archive"; You can even easier to drag the desired file into the program window. After that, a new dialog box "Name and archive parameters" will automatically open. You have left to establish a compression method for a new file. Maximum"And click on the OK button.

I think the reading of the article has benefited you. Now questions about maximum compression in WinRar went to the past, and if they arise or forget, our site website will help in restoring computer knowledge!

Data compression is the data transcoding procedure produced in order to reduce their volume. It is used to more ration to use storage and data transfer devices.
Compression happens without loss (when it is possible to restore the source data without distortion) or with losses (restoration possible with minor distortions). Compression without loss Used when processing computer programs and data, it is often called data archiving. Loss compression is usually used to reduce the volume of sound, photo and video information, it is much more efficient to compress without loss.
Compression is based on eliminating the redundancy of information contained in the source data. The degree of redundancy depends on the type of data. For example, video data degree is usually several times more than that of graphic data, and the degree of redundancy of graphic data is several times larger than text. In addition, the degree of data redundancy depends on the accepted coding system.
An example of redundancy is the repetition of fragments in the text (for example, the words of a natural or machine language). Such redundancy is usually eliminated by replacing a repetitive sequence by a shorter value (code). Another type of redundancy is associated with the fact that some values \u200b\u200bin compressible data are more often found, while it is possible to replace frequently encountered data by shorter codes, and rare - longer (probabilistic compression). Compressing data that does not have a redundancy property (for example, a random signal or noise) is not possible.
Data compression issues are quite acute in various fields of science and technology, wherever the storage and transfer of information is required. Firstly, it is connected with the cost of media, secondly, with the need to transfer large streams of information on communication lines. In addition, data compression is inextricably linked with cryptography and information protection against accidental and deliberate impact.
Programs that archive data are called archivers. In archivers, developers strive to improve the two main parameters - the degree of compression and speed. The speed of operation disintegrates into two competing parameters - the archiving speed and the rate of ripples. It often happens no matter how long we squeeze the data, but the reverse transformation time is critical or vice versa. Sometimes it also turns out to be the amount of memory used. The remaining properties are less significant and usually not considered.

For these parameters, it is usually rarely possible to improve anything one, without worsching the other. In addition, the compression algorithm is optimal for some data types, can be absolutely not suitable for others. For example, the archiver created to eliminate the redundancy of texts of a natural language and built on the principles to achieve a large degree of compression of texts can not completely compress graphic data or even increase their volume.
In fact, researchers were scientifically proven the theorems that impose on the archivers and on the compression of these restrictions on the degree of compression.
1. For any data sequence, there is a theoretical compression limit that cannot be exceeded without loss of part of the information.
2. For any compression algorithm, you can specify such a data sequence for which this algorithm will not allow compression at all.
The source of archivers in connection can be called Azbuka Morse, in which a simple idea is laid for increasing the speed of communication - the letter of the alphabet is used, the shorter its code should be. In the future, information compression algorithms have become widely used in fax modem and radio communications, allowing in both cases to increase the rate of information transfer.
Inpusting of interest in archivers began with the advent of IBM-compatible personal computers. Prior to that, also existed compression programs, but they were known only to those skilled in the art and ensured the incomplete worst indicators of compression of information.
Modern software tools for creating and servicing archives are distinguished by a large volume. functionalityMany of which go far beyond simple data compression and efficiently complement standard means operating system. In this sense, modern data archiving tools are called archives dispatchers.
To the basic functions that most modern archive dispatchers include:
Removing files from archives
Creating new archives
Add files to available archive
Creating self-extracting archives
Creating distributed archives on low-capacity media
Testing the integrity of the archive structure
Full or partial restoration of damaged archives
Protection of archives from viewing and unauthorized modification.
Creating Continuous Archives (Solid)
Self-extracting archives. In cases where archiving is made to transfer the document to the consumer, it should be provided for the presence of a software needed to extract the source data from the compacted archive. If the consumer does not have such funds, they create self-extracting archives. A self-extracting archive is prepared on the basis of a regular archive by attaching a small software module to it. The archive itself receives an extension of the name.Ene, characteristic of executable files. The consumer will be able to run it as a program, after which the archive unpacking will occur on its computer automatically.
Distributed archives. In cases where it is assumed to transfer a large archive on carriers of low capacity, for example on flexible disksmaybe the distribution of one archive in the form of small fragments on several media.
Protection of archives. In most cases, archives are protected using a password, which is requested when trying to view, unpack or change the archive. Password protection is considered unsatisfactory and not recommended for particularly important information.
Continuous archives. Very high winnings in size (10-50%), especially when archiving a large number of small files, it turns out when using the creation of continuous archives. In this case, all data will be archived in the form of one big File, not everyone separately. This significantly increases the efficiency of compression information, but this method It has its drawbacks. First, to unpack several files from such an archive, you will need more time than to extract from the usual. Here it will be important, what accounts were archived files. If they were in the middle, then for their unpacking the program will need to unpack all files packed to the necessary until it gets to the required. Creating archives in this way can also entail high losses, because if the archive is damaged, all the files that were in it were lost. In the same place in conventional method, You can remove from the damaged archive not all, but most of the files.
TO additional features Archive dispatchers include service functions that make work more convenient:
View files of various formats without extracting them from the archive
Search for files and data inside archives
Installation of programs from archives without prior unpacking
Check of absence computer viruses in the archive before it is unpacking
Creating self-extracting multi-volume archives
Select or configure information compression ratio.
Files of various formats are compressed with varying degrees of efficiency. Graphic files are very well archived (80--85%) and MS Office documents (on average by 60%), a little worse - web pages (40--50%). For executable files, this indicator varies (~ 50% depending on the archiver) and in most cases quite low. Archiving practically does not affect the size of compressed files (graphic files in * .gif and * .jpg format, DivX films, CD images, etc.).
The most popular among users archivers:
Winzip.
WinRar
7zip.
WinCe
PowerArchiver
Winzip.
Cost: $ 7
Distribution size: 5929K
Manufacturer website: http://www.winzip.com/
Supported formats: CAB, GZIP, TAR, TGZ - only extract files. Zip - full support.
Correction of damaged archives: Not supported.

Multi-volume archives: limited support.
The most common format of archives is zip, and the most common archiver - WinZip. A low degree of compression is compensated by broad fame WinZip.
Despite the fact that the compression ratio of the program is small, it has a simple interface, as well as masters to create and unpack the archives. ZIP archives may include comments and be encrypted using a password. Support for multi-volume archives in the ZIP format itself is limited: they can be created only on floppy disk.
The standard WinZip version can create only the simplest self-extracting (SFX) archives. To start the program after extracting files from the archive or change the text in the unpacking window, you need to buy a WinZip Self-Extractor utility, paying another $ 49.
To increase the number of recognizable archives formats, it is possible to connect Arj and LHA archivers. WinZip is one of the first archivers with graphical interface Under Windows and still excellent integration of this product with Windows is a benchmark. But on this moment Competing archivers overtook him in compression, and by the convenience of the interface.
WinRar.
Cost: $ 29
Distribution size: 1035K
Manufacturer website: http://www.rarlab.com/
Supported formats: CAB, ARJ, LZH, TAR, GZIP, ACE, UUE, BZ2, JAR, ISO, 7Z - only extract files.
RAR, ZIP - full support.
Correction of damaged archives: Supported for RAR and ZIP formats.
Self-expanding archives: supported.
Encrypted archives: Supported.

Eternal competitor program WinZip. This archiver uses special love with Russians in many ways due to the fact that the compatriot Leonid Rosham. On the world market software Known as an archiver with one of the best data compression algorithms.
Restoring "spoiled" default archives is possible only for ZIP archives. In order to minimize the likelihood of data loss, when creating WinRar archives, it is recommended to use the "Recovery Information" option (this check box can be found on the General tab of the archive creation window). If this was done, then in case of damage to the archive, it can be restored. In addition, in WinRAR, you can reduce the likelihood of damage to the RAR archive, specifying it when it creates the size of information for recovery. To do this, execute the command "Commands"\u003e Add information to restore in the WinRar window. In this case, the amount of information for recovery cannot exceed ten percent of the overall archive size.
Multi-volume archiving provided by the archiver is significantly superior to the convenience of splitting the diskette method used in WinZip.
WinRAR understands almost all the well-known formats of archives. After installation, the program embeds its main labels to the main context menu, so you don't have to go to the main menu each time and search for programs there, and then understand it in its interface. All major tasks are already in context menu. Near each point there is a well-recognizable icon, so when you open the WinRar labels menu, "and immediately rush to the eye. When packing data, you can set the compression ratio of the archive or disconnect the compression. In addition, the program allows you to protect the password archives (you can specify What files from the archive should be available, even if the user does not know the password), write comments, create self-extracting archives. In WinRar, there is an opportunity to take advantage of the special multimedia compression algorithm that optimizes the compression of digitized audio and graphic files.
For users who communicate with the archiver for the first time, special masters are provided, which will quickly enter into a case. The program itself has a pleasant interface that does not cause any problems in mastering.
7zip.
Cost: 0 $
Distribution size: 837K
Manufacturer website: http://www.7-zip.org/
Supported formats: RAR, CAB, ARJ, Z, CPIO, RPM, DEB, Split- only extract files.
ZIP, GZIP, TAR, BZIP2, 7Z - full support.
Correction of damaged archives: Not supported
Self-expanding archives: supported.
Encrypted archives: Supported.
Continuous archives: supported.
Multi-volume archives: supported.
This is another archiver from Russian developers. Thanks to the more advanced compression algorithm, the quality of data archiving for its own format * .7z is even winrar. True, such a compression ratio is achieved due to the fact that the archiver works more slowly. The rest of the 7-Zip really largely exceeds more well-known competitors, and therefore the preference is given to him more and more users.
The interface has 7-zip ascetic, but no need to forget that the program is still at an early development stage and is actively developing. That the developer takes care of the distribution of the product around the world, says that the program supports a huge number of languages \u200b\u200b- in latest version The programs of their over sixty. Of course, there is Russian.
7-Zip makes it possible to create archives protected by password, as well as encrypt file names in archives. This uses a 256-bit AES algorithm. It was this algorithm that was chosen by the American National Institute of Standards and Technologies (NIST) as a cryptographic standard for the near future, so it can be said that this is one of the best encryption algorithms to date.
The advantage of the program is that it is absolutely free unlike its competitors, the author just asks to support the development, paying him a remuneration of $ 20.
WinCe
Cost: $ 29
Distribution size: 3801
Manufacturer website: http://www.winace.com/
Supported formats: ACE, ZIP, LHA, MS-CAB, ARC, ARJ, GZIP, TAR, BZIP2, ISO, ZOO, RAR- only extract files.
ACE, ZIP, LHA, MS-CAB, JAR-full support.
Correct damaged archives: Supported for ACE and ZIP formats.
Self-expanding archives: supported.
Encrypted archives: Supported.
Continuous archives: supported.
Multi-volume archives: supported.
Despite the fact that WinACE is produced for quite a long time, to achieve such popularity among users like WinRar, the archival was failed. In order for the archiver to compete with a competitor, it must exceed the opponent in two parameters - the speed and degree of compression. The size of the archives in ACE format is often less than after using WinRAR, but not enough to attract attention. In addition, WinCe is not a quick job, spending almost twice as much time compared to WinRar. If we compare WinACE with 7zip, then the main disadvantage of the archiver can be considered.
The disadvantages of WinACE can also be attributed to the fact that the archiver does not differ in high stability of work, and as a result, from time to time the program window closes due to the "unacceptable operation". This is a serious disadvantage, especially considering the practically trouble-free work of WinRar and 7zip.
To improve the compression of graphic and sound, as well as executable (* .ex) files, additional multimedia-compression algorithms are implemented in the archiver, and for all other data types - delta compression. Creation of continuous archives is supported, checking for the integrity of all familiar formats program, restoring damaged ACE and ZIP archives and much more. In addition, you can convert the archives of various formats in ASA to reduce their size. The program has excellent integration with Windows.
PowerArchiver
Cost: $ 20
Distribution size: 3712K
Manufacturer website: http://www.powerarchiver.com/
Supported formats: RAR, ARJ, ARC, ACE, ZOO, ISO, BIN, IMG, NRG- only extract files.
Zip, 7-Zip, Cab, LHA (LZH), TAR, GZIP, BZIP2, BH - full support.
Correction of damaged archives: Supported for ZIP format.
Self-expanding archives: supported.
Encrypted archives: Supported.
Continuous archives: not supported.
Multi-volume archives: supported.
PowerArchiver is a very powerful archiver. Beautiful, comfortable and understandable interface. Powerarchiver Unlike WinRAR, 7Zip and WinCe does not provide its own format for data compression, however, it supports a large number of different archives including RAR, ACE and 7-ZIP, and the latter is fully supported.
The built-in viewer allows "on the fly" to view TXT, RTF and all popular graphic file formats right in the archive. In addition, PowerArchiver offers the user 5 different encryption methods of particularly secret data.
The rest of the functions set is standard: converting various archives in those that are fully supported by the program, excellent integration with Windows, the ability to create multivolume zip-archives and many others. The special pride of the authors of the program is that she received a certificate from Microsoft as software optimized under Windows XP, with all the "consequences" arising from here, namely, the Support for Windows XP. Yes, and PowerArchiver himself boasts a mass of its own skins, designed to completely change its appearance.
When archiving information is difficult to say, which of the archivers in this case will allow to obtain the maximum degree of compression. It is most likely that WinRAR will better cope with the three WinAce-WinRAR-7ZIP. However, even when compressing files of the same type (for example, a BMP graphical format), it is often impossible to determine in advance which file will be better than the file, the highest compression ratio can be from any of the listed archivers. In most cases, it is possible to determine the optimal compression format only empirically using the optimization functions for a particular type and size of compressible information. Therefore, if the size of the compressed file really matters, before sending the file by mail, placement on the FTP server or before recording it to the laser disk, it is best to collect the data at once in three archivers and see which one coped with the task better than others.
List of used literature.
Fomin A.A. "Basics of compression information"
http://www.powerarchiver.com/
http://www.winace.com/
http://www.7-zip.org/
http://www.rarlab.com/
http://www.winzip.com/
http://ru.wikipedia.org/wiki/Archivation
http://256bit.ru/informat/index9.htm.
http://www.computerra.ru/hitech/novat/26988/