11 Oct
2007
11 Oct
'07
10:58 a.m.
> CDOS had one or more bytes in the first physical
sector of the disk to
> identify which format. There ARE multiple (user modifications?) variant
> formats that may have the same ID byte(s)!
On Thu, 11 Oct 2007, Dave Dunfield wrote:
Anyone have more info on this? - One of my main
problems is determining
exactly what format these disks are in.
It might be stored in the first sector, or it might be known only to the
OS.
On a functioning CP/M 2.x? machine, STAT DSK: gives some of the
parameters.
Does each entry represent a cluster?
Yes, each
of the numbers in the block list represents a "cluster" (which
is the MICROS~1 word for a block) Each OS company seems to have had their
own unique word (like "standards") for an allocation unit.
Remember that CP/M calls a 128 byte record a "sector" disunirregardless of
how many there are in each physical sector.