[2088] in linux-scsi channel archive
DAT drive density
daemon@ATHENA.MIT.EDU (Clem Pryke)
Mon Jun 30 20:29:11 1997
To: linux-scsi@vger.rutgers.edu
cc: pryke@aupc1.uchicago.edu
Date: Mon, 30 Jun 1997 19:20:09 -0500
From: Clem Pryke <pryke@aupc1.uchicago.edu>
I am running RH Linux 4.1 on a Dell Optiplex GX Pro with AHA2940 SCSI
contoller connected to a Seagate CDT8000R-S DAT drive.
I can write tapes using "tar cf /dev/nst0 datafile" etc, and read them
back fine. However the tapes get full after approx 1 GB. It a DDS-2 (4
GB native) drive so this is not right.
With a tape inserted "mt status" gives:
SCSI 2 tape drive:
File number=0, block number=0, partition=0.
Tape block size 512 bytes. Density code 0x13 (DDS (61000 bpi)).
Soft error count since last status=0
General status bits on (41010000):
BOT ONLINE IM_REP_EN
"mt densities" gives:
Some SCSI tape density codes:
code explanation
0x00 default
[snip]
0x13 DDS (61000 bpi)
[snip]
0x24 DDS-2
[snip]
So with no tape inserted I do "mt defdensity 0x24", and then load a
tape. Now "mt status" gives:
SCSI 2 tape drive:
File number=0, block number=0, partition=0.
Tape block size 512 bytes. Density code 0x24 (DDS-2).
Soft error count since last status=0
General status bits on (41010000):
BOT ONLINE IM_REP_EN
so everything looks good until I write to the tape. Afterwards "mt
status" reports "Density code 0x13" and I am still getting 1 GB tape
capacity.
The drive is OK. I can write 4 GB tapes in WinNT. Please help.
--
**********************************************************************
Clem Pryke
University of Chicago,
Room 226, LASR, 933 East 56th Street, Chicago, Illinois 60637, USA
Tel: 773 702-7853 Fax: 773 702-6645 email: pryke@hep.uchicago.edu
anonymous ftp: aupc1.uchicago.edu pub/auger/pryke
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