Dying Apple 3.5 drive

[Adam Myrow <hurry@imap2.asu.edu>]

It appears that my Apple 3.5-inch drive may be about to give up the ghost.
Here are the symptoms.  I can read from disks fine but have trouble
writing back to them.  For example, I can format a new disk and scan it
for bad blocks.  None will be found.  I can then unpack a Shrinkit archive
onto the disk and when I re-scan it, there are suddenly bad blocks where I
unpacked the archive.  I can do this over and over and the results are
always the same.  Sometimes, the seemingly good disk will report an I/O
error in mid-write.  I thought I had a batch of bad disks at first but it
happens with any disk I try to use.  This is frustrating!

     I have a ROM 01 Apple IIgs with only 1.25 megs of RAM, a 3.5-inch
drive and a 5.25-inch drive.  The 5.25-inch drive seems to be working

fine.  Any ideas as to where to look for the problem?

Adam Myrow