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why_arj.doc
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1995-10-31
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WHY_ARJ.DOC July 1995
This document describes the benefits of ARJ. ARJ is a trend setter
in PC file archivers.
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 données: 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."
PC Magazine, October 12, 1993, ARJ: A Worthy Competitor to PKZIP,
Barry Simon. "We tested ARJ 2.41a against PKZIP 2.04g ... Overall,
PKZIP proved to be faster, but compression results with the two
programs were about equal. Where ARJ comes out ahead is in its many
options ... ARJ's ability to compress data onto multiple floppy
disks is especially good."
ARJ FEATURES:
1) Registered users receive technical support from a full-time
software author with over SIXTEEN 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
available. We test our BETA test releases with the help of
thousands of users.
ARJ has proven reliable and stable on numerous PC platforms
unlike some of our competition. This can be significant in terms
of technical support issues for vendors using ARJ software to
install their software. Technical support costs due to
installation software failures add up. This may be the most
significant plus of ARJ when comparing archivers.
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 two other very
popular archivers produced a compressed file of 17 plus
megabytes. Please note that compression results are highly
dependent upon the type of data compressed.
3) Compared to the popular archivers PKZIP, LHA, ARC, PAK, and
ZOO, only ARJ can archive up to 32,000 files at one time. This
enables ARJ to handle very large disk drives.
4) Compared to PKZIP, LHA, ARC, PAK, and ZOO, 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 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
inexpensive 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.
In addition, only ARJ allows the user to restart an aborted
backup at the disk where the failure occurred.
5) Compared to PKZIP, LHA, ARC, PAK, and ZOO, only ARJ provides
multiple volume self-extracting archives.
6) 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) Extract selected files based upon a text search.
k) Name archives automatically based upon date or time.
l) And much more.
7) 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.
8) 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 direct