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Unix v4 Tape Found

https://discuss.systems/@ricci/115504720054699983
130•greatquux•4d ago
https://oldbytes.space/@bitsavers/115505135441862982

https://www.theregister.com/2025/11/07/unix_fourth_edition_t...

Comments

sema4hacker•4d ago
From 1973. See https://en.wikipedia.org/wiki/List_of_Unix_systems
lproven•2d ago
Other posts on this subject, none with discussion:

https://news.ycombinator.com/item?id=45846438

https://news.ycombinator.com/item?id=45844876

https://news.ycombinator.com/item?id=45842643

dang•1h ago
I've added https://oldbytes.space/@bitsavers/115505135441862982 and https://www.theregister.com/2025/11/07/unix_fourth_edition_t... to the toptext as well. Thanks!
ndiddy•1h ago
https://news.ycombinator.com/item?id=45857695 has discussion
lproven•2d ago
Anyway, since nobody much seems to realise this is quite a big deal, I will share the explainer I wrote yesterday:

https://www.theregister.com/2025/11/07/unix_fourth_edition_t...

Unix V4 is otherwise lost. It was the first version in C.

mongol•1h ago
Interesting article. I agree it is kind of a big deal. Certainly worth the effort to try to restore
nullhole•16m ago
The bit in the article about the recovery procedure, which involves dumping info from the tape into '100-ish GB of RAM' and then using software to analyze it stuck out to me.

This video on the linked github page for the analysis software[1] is interesting:

https://www.youtube.com/watch?v=7YoolSAHR5w&t=4200s

[1] https://github.com/LenShustek/readtape

kazinator•1h ago
That is a big deal; I don't remember anything that old being available on tuhs.org.
accrual•1h ago
> It is a '70s 1200ft 3M tape, likely 9 track, which has a pretty good chance of being recoverable.

Not old enough to have this kind of knowledge or confidence. I wonder if instead one day I'll be helping some future generation read old floppies, CDs, and IDE/ATA disks *slaps top of AT tower*.

retrac•1h ago
You might be able to use that old floppy drive. But you won't be able to use that old Pentium machine the drive is in.

Because you will need several hundred gigabytes of RAM and a very fast IO bus.

The gold standard today for archiving magnetic media is to make a flux image.

The media is treated as if it were an analog recording and sampled at such a high rate that the smallest details are captured. Interpretation is done later, in software. The only antique electronics involved are often the tape or drive head, directly connected to a high speed digitizer.

And indeed that appears to be the plan Al Kossow has for the tape: https://www.tuhs.org/pipermail/tuhs/2025-November/032765.htm...

As for CDs, I don't see the rush; the ones that were properly made will likely outlast human civilization.

fsckboy•58m ago
>As for CDs, I don't see the rush; the ones that were properly made will likely outlast human civilization.

recordable CD-Rs or DVD-Rs do not last close to that long, and those are the ones that hold the only copies of certain bits (original versions of software, etc) that people are most interested in not losing.

manufactured CDs and DVDs hold commericial music and films that are for the most part not rare at all.

codezero•7m ago
Just anecdata, but I had this concern when I worked in academia and we backed up all our data to writable DVDs. I was there 10 years after the start of the project and I periodically checked the old DVDs to make sure they weren't corrupted.

After 10 years, which was longer than the assumed shelf life of writable/rewritable DVDs at the time, I never found a single corrupt file on the disks. They were stored in ideal conditions though, in a case, in a closed climate controlled shelf, and rarely if ever removed or used.

Also, just because I think it's funny, the archive was over 4000 DVDs. (We had a redundant copies of the data compressed and uncompressed, I think it was like 3000 uncompressed 1k compressed) there was also an offsite redundant copy we put on portable IDE (and eventually SATA) drives.

reactordev•59m ago
Please let there be an ultimate force in the universe that spared this tape from tape degradation and/or magnetization that it can be read and extracted into a raw dump fs that we can preserve for all time. (fingers crossed)

Tapes from back then haven’t held up over the years. It all depends on the environment it was stored in.

ekjhgkejhgk•1m ago
OT - Mastodon is seriously cool. If you haven't yet bothered, I suggest to everyone that you spend a bit of time exploring.

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https://discuss.systems/@ricci/115504720054699983
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