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- From: msmith@beta.tricity.wsu.edu (Dragon Lord)
- Subject: Re: is CMS trakker 250mb tape backup for real
- Message-ID: <1993Jan3.041610.29048@serval.net.wsu.edu>
- Sender: news@serval.net.wsu.edu (USENET News System)
- Organization: Washington State University Tri-Cities, Richland
- References: <8907@lhdsy1.lahabra.chevron.com> <rreiner.725841329@yorku.ca> <1993Jan2.192357.22165@digi.lonestar.org>
- Date: Sun, 3 Jan 93 04:16:10 GMT
- Lines: 28
-
- In article <1993Jan2.192357.22165@digi.lonestar.org> kgallagh@digi.lonestar.org (Kevin Gallagher) writes:
- >In article <rreiner.725841329@yorku.ca> rreiner@nexus.yorku.ca (Richard Reiner) writes:
- >>hwrvo@kato.lahabra.chevron.com (W.R. Volz) writes:
- >>
- >>>Someone mentioned that the Colorado 250 mb tape backup
- >>>was really a 125mb tape system with compression software
- >>>and CMS hoped to get 2:1 compression. Is this for real??
- >>>If so, why can't I buy a CMS 125mb drive and use Norton
- >>>Backup to get the same thing.
- >>
- >>Probably because the 125 is really a 60MB drive with data compression
- >>software...
- >>
- >>This appears to have become standard practice in the PC tape drive
- >>industry. IOMega sells a series of "250" drives that use DC2120 -- i.e.
- >>120MB -- tapes, with a bundled copy of Central Point Backup doing the
- >>compression. Irwin and CMS label their stuff the same way.
- >
- >The Jumbo 120 and Jumbo 250 use different encoding schemes on the tape. The
- >250 encoding scheme succeeds in squeezing about 125 MB of data onto a DC2120
- >tape. The Jumbo 120 can get about 60 MB of data onto a DC2120.
- >
-
- The way CMS explaned it is that the difference between 60M and 125M on
- the same tape is not encoding, rather data density. The DJ-20 (jumbo
- 250) puts 125M of uncompressed data on the tape by using smaller read
- write heads that allows for narrower tracks, there fore more tracks on
- the tape.
-