Re: Q: Disk drives for //c...

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: : I remember there was something with two small capacitors on the DuoDisk
: : analog board which have to be removed. Perhaps anybody else knows more
: : about this?

: There are two capacitors which must be clipped from the board on the
: DuoDisk regardless of what machine you intend to use them on.  Failure to
: do this can cause very nasty failures...for instance, the copy-protection
: scheme used on Pascal format applications, and possibly others (when I
: watched it happen, it was with PFS:File) can, under certain circumstances,
: cause the drive to start writing unexpectedly...say, during a
: re-boot...thus trashing the disk without regard to the write-protect switch.

The Modification From My technical Notes, It is easy to do:

"Data on Disk is damaged when using "Open-Apple-CTL-Reset" for rebooting,
or when using software with certain copyright protection schemes.  Analog
board PN is 676-[]101 or 676-[]102."

The analog board is the one inside Drive 1 in the Duodisk.  You may have
to unplug the cable near the back right of the board to see the board's
model number.  Anyway, if you have the -101 or -102 board, just cut off
capacitors C29 and C30 (at board locations A1 and B1, respectively).

I have done this with all DuoDisks I have sold and my own DuoDisks.  It is
amazing that after all of this time most still have not had the mod
done...

Sorry,  I can't find my notes on the IIgs modification, I'll bet someone
can add them to the thread.

Chet Gerhardt