Recovering data from 4mm and 8mm tapes
Nico de Jong
nico at farumdata.dk
Mon Mar 23 11:21:48 CDT 2015
----- Original Message -----
From: "Douglas Taylor" <dj.taylor4 at verizon.net>
To: <General at classiccmp.org>; "Discussion at classiccmp.org:On-Topic Posts"
<cctech at classiccmp.org>
Sent: Monday, March 23, 2015 4:46 PM
Subject: Recovering data from 4mm and 8mm tapes
> I have a couple of 4mm and 8mm tapes that contain data I want to recover.
> The 4mm is DDS-1 and was written using tar on a SGI system in 1998. My
> questions are;
> 'What modern DAT tape drive will read this tape? How backward compatible
> is this technology?'
> The 8mm tapes were also written on an SGI system, however it was in 1994
> and the IRIX Backup utility was used. IRIX 5 was probably used. Any
DDS-1 can normally be read on DDS-2, in my experience. I seem to remember
that Sony and HP DDS drives of that generation are not totally
interchangeable, especially for the compression routines. But I might
confuse it with some other system.
Are the 8 mm tapes Exabyte format? Exabyte drives are normally 1 or 2
versions upwards compatible, so you can read 8200 tapes on 8500 drives, but
probably not on Eliant drives, etc.
I have now idea on how IRIX handled the backup.
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