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Why arj

Compuer studies.

WHY_ARJ.DOC Jan 1997

This document describes the benefits of ARJ. ARJ is now a trend

setter in archivers with other archivers following suit.

You can find reviews of ARJ in the following magazine articles:

Computer Personlich, June 12, 1991, Leader of the Pack, Bernd

Wiebelt and Matthias Fichtner. In this German magazine, ARJ 2.0 was

named Test Sieger (Test Winner) over six other archivers including

PKZIP and LHA. Compression, speed, documentation, and features were

compared.

PC Sources, July 1991, Forum, Barry Brenesal, "A new challenger, ARJ

2.0, not only offers the speed of PKZIP, but also has the best

compression rate of the bunch."

Computer Shopper, September 1991, Shells, Bells, and Files:

Compressors for All Cases, Craig Menefee. "ARJ ... is extremely fast

and produces excellent compression; it ... has a rich set of options.

... This is a mature technology, and any of these programs will do a

fine and reliable job."

PC Magazine, October 15, 1991, Squeeze Play, Barry Simon. "Jung has

combined that foundation with academic research to produce an

impressive product. ... If your main criterion is compressed size,

ARJ will be one of your two main contenders, along with LHA."

SHAREWARE Magazine, Nov-Dec 1991, Fall Releases, Joseph Speaks. "Don't

tell the creators of ARJ that PKZIP is the standard for data

compression. They probably already know. But that hasn't stopped

them from creating a data compression utility that makes everyone -

even the folks at PKWare - sit up and take notice. ... but compression

statistics don't tell the whole story. The case for using ARJ is

strengthened by new features it debuts."

BOARDWATCH Magazine, December 1991, ARCHIVE/COMPRESSION UTILITIES.

"This year's analysis rendered a surprise winner. Robert K. Jung's

ARJ Version 2.22 is a relatively new compression utility that offers

surprising performance. The program emerged on the scene within the

past year and the 2.22 version was released in October 1991. It rated

number one on .EXE and database files and number two behind LHarc

Version 2.13 in our directory of 221 short text files."

INFO'PC, October 1992, Compression de donn‚es: 6 utilitaires du

domaine public, Thierry Platon. In this article, the French magazine

awarded ARJ 2.20, the Certificat de Qualification Labo-tests InfoPC.

PC Magazine, March 16, 1993, PKZIP Now Faster, More Efficient,

Barry Simon. "One of the more interesting features is the ability to

have a .ZIP file span multiple floppy disks, but this feature is not

nearly as well implemented as in ARJ."

ARJ FEATURES:

1) Registered users receive technical support from a full-time

software author with over FIFTEEN years of experience in

technical support and software programming. And YES, ARJ is a

full-time endeavor for our software company. ARJ and REARJ have

proven to be two of the most reliable archiver products. We

test our BETA test releases with the help of thousands of users.

2) ARJ provides excellent size compression and practical speed

compared to the other products currently available on the PC.

ARJ is particularly strong compressing databases, uncompressed

graphics files, and large documents. One user reported that in

compressing a 25 megabyte MUMPS medical database, ARJ produced

a compressed file of size 0.17 megabytes while LHA 2.13 and

PKZIP 1.10 produced a compressed file of 17 plus megabytes.

3) Of the leading archivers, only ARJ provides the capability of

archiving files to multiple volume archives no matter what the

destination media. ARJ can archive files directly to diskettes

no matter how large or how numerous the input files are and

without requiring EXTRA disk space.

This feature makes ARJ (DEARJ) especially suitable for

distributing large software packages without the concerns about

fitting entire files on one diskette. ARJ will automatically

split files when necessary and will reassemble them upon

extraction without using any EXTRA disk space.

This multiple volume feature of ARJ makes it suitable as a "cheap"

backup utility. ARJ saves pathname information, file date-time

stamps, and file attributes in the archive volumes. ARJ can also

create an index file with information about the contents of each

volume. For systems with multiple drives, ARJ can be configured

to save the DRIVE letter information, too. Files contained

entirely within one volume are easily extracted using just the one

volume. There is no need to always insert the last diskette of

the set. In addition, the ARJ data verification facility unique

to ARJ among archivers helps ensure reliable backups.

4) The myriad number of ARJ commands and options allow the user

outstanding flexibility in archiver usage. No other leading PC

archiver gives you that flexibility.

Here are some examples of ARJ's flexibility.

a) Search archives for text data without extracting the

archives to disk.

b) Save drive letter and pathname information.

c) Re-order the files within an ARJ archive.

d) Merge two or more ARJ archives without re-compressing files.

e) Extract files directly to DOS devices.

f) Synchronize an archive and a directory of files with just a

few commands.

g) Compare the contents of an archive and a directory of files

byte for byte without extracting the archive to disk.

h) Allow duplicates of a file to be archived producing

generations (versions) of a file within an archive.

i) Display archive creation and modification date and time.

j) And much more.

5) ARJ provides ARJ archive compatibility from revision 1.00 to now.

In other words, ARJ version 1.00 can extract the files from an

archive created by the current version of ARJ and vice-versa.

6) ARJ provides the facility to store EMPTY directories within its

archives. This makes it easier to do FULL backups and also to

distribute software products that come with EMPTY directories.

7) Both ARJ self-extracting modules provide default pathname support.

That means that you can build self-extracting archives of software

directories containing sub-directories. The end user of the

self-extracting archive does not have to type any command line

options to restore the full directory structure of the software.

This greatly simplifies software distribution.

8) The ARJ archive data structure with its header structure and 32

bit CRC provide excellent archive stability and recovery

capabilities. In addition, ARJ is the only archiver that allows

you to test an archive during an archive process. With other

archivers, you may have already deleted the input files with a

"move" command before you could test the built archive. In

addition, the test feature allows one to select an actual byte for

byte file compare with the original input files. This is

especially useful for verifying multi-megabyte files where a 32 bit

CRC compare would not provide sufficient reliability.

9) ARJ provides an optional security envelope facility to "lock" ARJ

archives with a unique envelope signature. A "locked" ARJ

archive cannot be modified by ARJ or other programs without

destroying the envelope signature. This provides some level of

assurance to the user receiving a "locked" ARJ archive that the

contents of the archive are intact as the "signer" intended.

10) ARJ has MS-DOS 3.x international language support. This makes ARJ

more convenient to use with international alphabets.

11) ARJ has many satisfied users in countries all over the world. ARJ

customers include the US government and many leading companies

including Lotus Development Corp.

Source: Essay UK - http://www.essay.uk.com/coursework/why-arj.php



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