From: Alan Glasser <alanglasser@gmail.com>
To: "Charles H. Sauer" <sauer@technologists.com>
Cc: tuhs@minnie.tuhs.org
Subject: Re: [TUHS] PL/I stuff - was: Book Recommendation
Date: Fri, 26 Nov 2021 21:43:10 -0500 [thread overview]
Message-ID: <40B6AD3F-B40C-4F37-A802-51B1A39C0C51@gmail.com> (raw)
In-Reply-To: <632335e1-c1ea-0eb8-2629-3e0829057da7@technologists.com>
On second thought, given that the Worldnet outage was late 1996, it was most likely that the backups were to 8mm tape. Exabyte?!
- Alan
> On Nov 26, 2021, at 8:10 PM, Charles H. Sauer <sauer@technologists.com> wrote:
>
> I haven't done anything with 9 track tapes for a long time, but I used to help my father with his statistical research, processing what at the time seemed massive census and similar data sets on 9 track tape (using PL/I on 370s at U. MO Columbia). Some of his tapes were quite old, stored in his basement and then his garage, but I don't recall problems reading any of them.
>
> IMNSHO, it all depends on the brand/formulation of the tape. I've been going through old audio tapes and digitizing them (https://notes.technologists.com/notes/2021/08/21/making-private-1960s-and-70s-recordings-public/). Some are over 50 years old and still seem as good to me as when they were recorded. Others, I can anticipate from the brand/formulation that they are going to be trouble, if salvageable at all. Most surprisingly, unbranded and similar budget tapes have survived as well or better than some of the high-priced stuff. A few days ago I tried a reel from 1968. I was dismayed by how many times it had been spliced, but replace the splicing tape and found it viable.
>
> I have dozens of DDS-2, 3 & 4 cartridges from the 90s that I occasionally try to read. I don't recall any of them failing.
>
> (We probably should be COFFing this up.)
>
> Charlie
>
>> On 11/26/2021 6:30 PM, Larry McVoy wrote:
>>> On Fri, Nov 26, 2021 at 07:23:07PM -0500, Dennis Boone wrote:
>>> > In my experience 9 track tapes were not guaranteed to be readable after
>>> > some interval. In fact, a standard operations procedure was to copy
>>> > important tapes to new media periodically.
>>>
>>> There are always ways in which your backups can go wrong and not be
>>> readable, and I'm not arguing that here.
>>>
>>> But 9 track tapes have turned out to be pretty spectacularly long-lived.
>>> I've personally read tapes that were stored for 30+ years in
>>> unconditioned spaces.
>> Contrast that with the write only exabyte tapes. I lost some stuff to those.
>
> --
> voice: +1.512.784.7526 e-mail: sauer@technologists.com
> fax: +1.512.346.5240 Web: https://technologists.com/sauer/
> Facebook/Google/Twitter: CharlesHSauer
next prev parent reply other threads:[~2021-11-27 2:46 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-16 14:57 [TUHS] " Douglas McIlroy
2021-11-16 15:22 ` Richard Salz
2021-11-16 15:52 ` Ron Natalie
2021-11-23 2:28 ` Mary Ann Horton
2021-11-23 7:57 ` Henry Bent
2021-11-23 8:10 ` arnold
2021-11-23 8:28 ` Henry Bent
2021-11-23 17:26 ` Adam Thornton
2021-11-23 18:54 ` Ron Natalie
2021-11-23 19:04 ` Al Kossow
2021-11-23 19:39 ` Lawrence Stewart
2021-11-23 19:08 ` Ron Natalie
2021-11-23 21:54 ` Thomas Paulsen
2021-11-24 15:18 ` Richard Salz
2021-11-24 15:45 ` Larry McVoy
2021-11-24 18:34 ` Rich Morin
2021-11-24 18:40 ` Larry McVoy
2021-11-24 19:39 ` Clem Cole
2021-11-24 20:02 ` Larry McVoy
2021-11-26 19:49 ` [TUHS] AIX/SMIT (was Book Recommendation) Greg A. Woods
2021-11-25 10:26 ` [TUHS] Book Recommendation Tom Ivar Helbekkmo via TUHS
2021-11-25 12:20 ` [TUHS] AIX/SMIT (was Re: Book Recommendation) Stuart Remphrey
2021-11-24 20:13 ` [TUHS] Book Recommendation arnold
2021-11-24 20:18 ` Will Senn
2021-11-25 7:22 ` arnold
2021-11-24 20:15 ` Rob Pike
2021-11-24 20:21 ` joe mcguckin
2021-11-24 20:27 ` Rob Pike
2021-11-24 21:27 ` Richard Salz
2021-11-24 22:19 ` Charles Anthony
2021-11-24 22:29 ` [TUHS] PL/I stuff - was: " Will Senn
2021-11-24 23:00 ` Rob Pike
2021-11-24 23:13 ` Richard Salz
2021-11-25 1:48 ` Nelson H. F. Beebe
2021-11-25 2:03 ` George Michaelson
2021-11-25 14:47 ` Clem Cole
2021-11-26 22:20 ` Alan Glasser
2021-11-26 22:33 ` Alan Glasser
2021-11-27 0:23 ` Dennis Boone
2021-11-27 0:30 ` Larry McVoy
2021-11-27 0:47 ` Charles H. Sauer
2021-11-27 2:43 ` Alan Glasser [this message]
2021-11-27 0:56 ` Warner Losh
2021-11-24 23:54 Douglas McIlroy
2021-11-25 16:35 ` Paul Winalski
2021-11-25 18:15 ` Steve Nickolas
2021-11-26 16:59 ` Paul Winalski
2021-11-26 20:30 ` Tom Ivar Helbekkmo via TUHS
2021-11-26 21:22 ` John Cowan
2021-11-27 0:01 ` George Michaelson
2021-11-27 16:12 ` Paul Winalski
2021-11-27 15:25 Noel Chiappa
2021-11-27 15:53 ` Charles H Sauer
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