[5236] in linux-scsi channel archive
Re: Linux 4mm SCSI DAT Drive Settings
daemon@ATHENA.MIT.EDU (Pete Popov)
Sun Nov 29 18:17:46 1998
Date: Sun, 29 Nov 1998 13:39:33 -0800
From: Pete Popov <ppopov@redcreek.com>
To: Kai.Makisara@metla.fi
CC: Popov <popov@ix.netcom.com>, Jon Lewis <jlewis@inorganic5.fdt.net>,
Martin Gallant <martyg@wired.ml.org>, amanda-users@amanda.org,
linux-scsi@vger.rutgers.edu
Kai Makisara wrote:
> On Sat, 28 Nov 1998, Popov wrote:
> ...
> > All DAT drives I know of are SCSI, so the block size issue is a SCSI thing,
> > not a DAT or DDS one. If a drive claims to be SCSI X compliant, then it
> > must support all sizes supported by SCSI sequential access devices, and
> > there's pretty much no limit as to what the size can be.
> >
> The SCSI standard _allows_ a tape drive to support many block sizes but it
> is not _required_. A drive may support only fixed block mode with one
> block size. Examples of this kind of drives are the early QIC cartridge
> drives.
True, but I was only talking about DDS drives. The ones I've worked with
supported all sizes.
> If a drive supports variable block mode, it must support fixed
> block mode. The block size limits can be anything the drive manufacturer
> chooses. There is a SCSI command to ask the drive what the limits are.
Pete
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