From: Arthur Krewat <krewat@kilonet.net>
To: tuhs@minnie.tuhs.org
Subject: Re: [TUHS] Someone wants to use an exabyte
Date: Mon, 25 Nov 2019 12:40:22 -0500 [thread overview]
Message-ID: <96b55e5e-4b05-f7b7-c2ae-efdae7c18b2f@kilonet.net> (raw)
In-Reply-To: <0a6fb097-fe79-1633-0205-1c45f0a56953@bitsavers.org>
A few years back, I decided to go through my stack of 8mm
Exabyte-written tapes... An early Exabyte 8200 2GB Exabyte drive was
useless. A 2/5G drive worked.
There were errors on one or two tapes. But each and every one was an
analog 8mm video tape, not a real data tape. And I was able to splice
the backup set enough so that whatever it was written with would be
happy enough to restore the data once pieced back together. A mix of
tar, and ufsbackup for the most part.
During this process, I bought an Exabyte Mammoth off eBay - didn't use
it much, but it read those old tapes just fine.
I was able to recover scads of personal stuff that I already had copies
of, along with a few dumps of the USENET systems I was using to serve as
a 3-modem BBS for USENET. And yes, sometimes, I go back into old backup
tapes to recover data I already have on disk. I hate bit-rot, I do
whatever I can to mitigate it.
art k.
PS: DAT 4mm tape drives, especially whatever Sun was using, were awful.
Around 50% of them I dealt with all got into a mode within the first
year where they would accept a tape, and just kick it back out right
away. Because they were under support, they were just replaced, so I
never looked into it hardware-wise.
On 11/25/2019 12:07 PM, Al Kossow wrote:
>
> On 11/24/19 7:24 PM, Larry McVoy wrote:
>> So that sounds like a different problem. People correct me if I'm
>> wrong but the exabyte drives seemed to have a head alignment problem.
> They are 8mm helical-head drives. they wouldn't go out of alignment by
> bumping them, the worse would be the tape would lose tension if you
> smacked the tensioning arms hard enough
>
> They do have a lot of rubber parts inside.
> Rollers crack and belts go soft. I have several dozen dead EX8200s from that.
>
> I have a whole box of 8mm backup tapes that just came in, and a small
> number of working drives. The Linux software I wrote to do 9 track tape recovery
> from a SCSI 9 track drive works just fine on an Exabyte.
>
> And I'm not offering to read Jason's mystery reels.
>
>
>
>
>
>
next prev parent reply other threads:[~2019-11-25 17:40 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-24 22:39 Richard Salz
2019-11-24 22:50 ` Jim Capp
2019-11-24 22:52 ` Larry McVoy
2019-11-24 22:58 ` Rico Pajarola
2019-11-24 23:45 ` Clem Cole
2019-11-25 1:41 ` Dave Horsfall
2019-11-25 1:42 ` George Michaelson
2019-11-25 3:24 ` Larry McVoy
2019-11-25 17:07 ` Al Kossow
2019-11-25 17:40 ` Arthur Krewat [this message]
2019-11-25 17:45 ` Larry McVoy
2019-11-25 17:49 ` Jon Steinhart
2019-11-25 18:34 ` Arthur Krewat
2019-11-25 21:08 ` John P. Linderman
2019-11-25 21:11 ` ron
2019-11-25 21:30 ` John P. Linderman
2019-11-25 21:38 ` Dave Horsfall
2019-11-25 18:29 ` Warner Losh
2019-11-25 3:29 ` Dave Horsfall
2019-11-25 3:34 ` [TUHS] Someone wants to use an exabyte [ really bulk erasing ] Jon Steinhart
2019-11-25 3:59 ` William Pechter
2019-11-25 15:25 ` Clem Cole
2019-11-25 17:13 ` Al Kossow
2019-11-25 4:53 ` Dave Horsfall
2019-11-25 3:36 ` [TUHS] Someone wants to use an exabyte Larry McVoy
2019-11-25 22:34 ` Dave Horsfall
2019-11-26 1:38 ` Lawrence Stewart
2019-11-25 22:46 ` Dennis Boone
2019-11-25 22:57 ` Henry Bent
2019-11-27 19:31 ` John Foust
2019-11-27 20:56 ` Arthur Krewat
2019-11-27 21:25 ` Dave Horsfall
2019-11-25 18:12 Norman Wilson
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