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- Newsgroups: comp.sys.sgi
- Path: sparky!uunet!uunet.ca!imax!dave
- From: dave@imax.imax.com (Dave Martindale)
- Subject: Re: Need dump parameters for 4mm DAT
- Message-ID: <1992Dec15.141841.997@imax.imax.com>
- Organization: Imax Corporation, Mississauga Canada
- References: <1992Dec1.183607.9727@news.acns.nwu.edu> <t2s1sts@zuni.esd.sgi.com> <1992Dec2.163908.1277@news.acns.nwu.edu>
- Date: Tue, 15 Dec 1992 14:18:41 GMT
- Lines: 19
-
- gof@casbah.acns.nwu.edu (Gerald Fountain) writes:
- >I was looking at the parameters for the 8mm and they don't seem to add up
- >correctly. In the man page, it suggests the following for 8mm tapes dues to a
- >bug in dump. The parameters suggested are:
- > density == 54000 Bpi
- > length == 6000 feet
- >
- >This gives a storage of 54,000 * 12 * 6,000 = 3,700 MB
-
- Dump, excessively clever program that it is, also allows space for
- inter-record gaps on 9-track tape, so if you want dump to correctly
- calculate how much it will fit on a tape, you have to reverse-engineer
- the capacity calculation.
-
- I would guess that the numbers above are intended to be "big enough"
- to use a whole tape, without trying to accurately model exactly how
- much will fit on one tape.
-
- Dave
-