[TUHS] PL/I stuff - was: Book Recommendation

Warner Losh imp at bsdimp.com
Sat Nov 27 10:56:09 AEST 2021


On Fri, Nov 26, 2021, 5:32 PM Larry McVoy <lm at mcvoy.com> 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.
>

There is a reason that exabyte no longer exists. It used to take up a big
swath of central Boulder.

Warner

>
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