[net.micro.cbm] Changing Diskette ID

p_macdonald@moses.DEC (Paul 223-3439 CQ DX) (03/27/84)

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Someone out there must know how to do it!

How can I change that "unique" ID that I've assigned to a diskette during
its initialization process on the C-64?

I know its on Track 18, Sector 0, Bytes 162 and 163. But how can I change
it?

Thanks.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

miller@uiucdcs.UUCP (miller ) (03/29/84)

#R:decwrl:-650100:uiucdcs:36100067:000:728
uiucdcs!miller    Mar 28 20:34:00 1984

Once you've assigned an ID to a disk, I don't think you can change it.  You
see, it not only gets written to the sector you mentioned, but is also placed
in the headers at the start of each physical sector on the disk by the 1541's
on board 6502.  As far as I know, the only way to change it is to completely
re-new the disk.  Anyone know different?
BTW, it *is* important to use unique ID's for your disks.  Under some circum-
stances, the 1541 6502 does not reload the BAM if it detects the same ID.
Thus, it is possible to switch disks with the same ID and confuse the drive as
to which sectors are/are not allocated.  Alternately, an "initialize" command
sent to your drive will reload the BAM.

A. Ray Miller
Univ Illinois

paul@ism780.UUCP (03/31/84)

#R:decwrl:-650100:ism780:14900002:000:239
ism780!paul    Mar 29 12:59:00 1984

The disk ID is not just in the directory header, it is also in the sector
header of every sector on the disk.  You could get a 1541 drive to rewrite
the directory header sector (I think), but not all the sector headers.
-- Paul Perkins --

das@ecsvax.UUCP (04/05/84)

Additional ref: uiucdcs.6450


A widely advertised disk utility program called The Clone Machine has the
capability of changing a disk ID.  I don't know how it is done, but it
works.  In fact, if you use its program to "new" a disk, it always sets
the id to CC and the name to CLONE; you have to then go to the editing
utility to change to the name/id you want.  The important part of TCM is
its ability to copy disks, including some protected ones.  But it has
some problems -- more about that later.


     David A. Smith
     Department of Mathematics
     Duke University
     Durham, NC 27706
     (919) 684-2321
     {decvax,akgua}!mcnc!ecsvax!das

rwh@aesat.UUCP (Russell Herman) (04/11/84)

Did I miss (new to net and C-64) reviews of disk copy programs, or haven't there
been any? If former, I'd appreciate someone mailing me a summary; if latter,
I (and others probably) would like to hear experiences.
-- 
  ______			Russ Herman
 /      \			{allegra,ihnp4,linus,decvax}!utzoo!aesat!rwh
@( ?  ? )@			(416) 821-9190
 (  ||  )			AES Data Inc.
 ( \__/ )			1900 Minnesota Ct.
  \____/ 			Mississauga, Ont. CANADA L5N 3C9