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Re: History of disklables
On Wed, Dec 28, 2016 at 08:14:36PM +0100, Edgar Fu? wrote:
> > You must be misremembering something.
> Looks like it.
> So disklables are a BSD thing, not a DEC thing?
Ultrix has a disklabel format, and I've moved drives from VAX to MIPS
Ultrix systems, so the answer really is "it depends". I have also booted
Ultrix kernels on systems installed with plain 4.2BSD, however, and I didn't
lose access to my drives, so I assume (new-enough) Ultrix had both the DEC
disklabel support and the old compiled-in partitioning as a fallback.
For non-boot drives, you can use disktab, right? In that case I can't
recall how the partition boundary information actually gets to the kernel.
Do our VAX disk drivers for Unibus/Massbus hardware retain the compiled
in partitioning as a fallback? Without it, it'd be tough to even read
old Unix filesystems without modifying the disk contents (to write either
an Ultrix or 4.4BSD label into place).
Thor Lancelot Simon tls%panix.com@localhost
Ring the bells that still can ring.
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