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From: miller@uiucdcs.UUCP (miller )
Newsgroups: net.micro.cbm
Subject: Re: Changing Diskette ID - (nf)
Message-ID: <6450@uiucdcs.UUCP>
Date: Wed, 28-Mar-84 22:37:55 EST
Article-I.D.: uiucdcs.6450
Posted: Wed Mar 28 22:37:55 1984
Date-Received: Fri, 30-Mar-84 02:56:11 EST
Lines: 16

#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