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
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."
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
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