9 Jan
2021
9 Jan
'21
2:59 p.m.
On Sat, Jan 9, 2021, 2:55 PM David Gesswein <djg at pdp8online.com> wrote:
On Sat, Jan 09, 2021 at 01:06:19PM -0700, Warner Losh
wrote:
The rainbow has a different way to mark this stuff. Maybe there is some
reuse in it? See "on disk format" in
http://www.bitsavers.org/pdf/dec/rainbow/ms-dos/QV068-GZ_Rainbow_MS-DOS_V2.…
which seemed oddly complex for such an early standard. It talks about N
spare tracks that remapped sectors land in... I've never had a disk image
that uses them though... worth a shot in the absence of other data...
Warner
DEC standard 144 of any help?
http://bitsavers.org/pdf/dec/standards/EL-00144_B_DEC_STD_144_Disk_Standard…
Warner
Thanks for looking.
That standard is only capable of marking bad sectors. It doesn't have the
information on where the bad sectors were remapped to. I took a quick look
at the DSM image. It looks like cylinder 511 is where the controller
tables are. This cylinder does have a different format. The data didn't
match this standard.