Re: bad block fix?

[shack@onyx.southwind.net (Randy Shackelford)]

Louis Cornelio (lcornel@cello.gina.calstate.edu) wrote:

: Hi. Is there a fix for a bad block in a data disk that renders in 
: unreadable, w/ the msg "not a prodos or dos disk", ?

There is a byte or two in block 2 which ProDOS uses to identify a disk. If
this doesn't jibe, you get error $52 (I think) "not a ProDOS disk" from the
OS. Sounds like you had a disk munged enough to fool it. I would try running
a block editor on it and see if block 2 looks normal, with the volume name,
file names, and the like. If so you can probably cure it. My manuals are in
a box though and I forget where you look for the bytes that identify a
disk to ProDOS.
--
Randy Shackelford                                 I was internet
shack@southwind.net                               when internet wasn't cool