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From: CN.RNA@forsythe.stanford.edu (Richard Anderson)
Newsgroups: comp.sys.ibm.pc.rt
Subject: Re: dump command AOS4.3 w/ 6157 drive (summary)
Message-ID: <8181@lindy.Stanford.EDU>
Date: 22 Feb 90 20:56:56 GMT
Sender: news@lindy.Stanford.EDU (News Service)
Lines: 34


In article <7527@lindy.Stanford.EDU> I asked a question about
the dump command of AOS4.3 when used with a 6157-002 tape drive.

Based on information from IBM and elsewhere, I have concluded
that I should use the following form of the dump command when using
type DC6150 tape:

       dump 0usdf 10800 10000 /dev/st0 /dev/rhdxy

We are using an IBM 6157-002 Tape Drive, which requires either
of the following 3M Tape Cartridges:

DC600A  600 ft  12,500 ftpi  550 oersted  QIC-120  15-track  125 MB
DC6150  600 ft  12,500 ftpi  550 oersted  QIC-150  18-track  150 MB
(the latter used to be called DC600XTD)

The effective tape length is derived from the length of the tape
(600 ft) multiplied by the number of tracks (18 for DC6150 tape)
= 10800 ft.

According to a source at IBM:

"The density written to the tape is hardware controlled and can not
be changed.  The 6157-001 writes at 10,000 ftpi (flux transactions
per inch) which is approximately equivalent to a density rating of
8,000 bits per inch.  The 6157-002 writes at 12,500 ftpi which is
equivalent to a density rating of 10,000 bits per inch."

Thanks for the help of all who responded to me.

      Richard Anderson
      Stanford University Libraries
      cn.rna@forsythe.stanford.edu