home *** CD-ROM | disk | FTP | other *** search
-
- WHY_ARJ.DOC April 1993
-
-
- 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 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."
-
-
- 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.
-
- end document
-
-