File Transfer Problem (IIgs)

[Iosaef the Irascable <skid@tigressSPAMNOT.com>]

Hey everyone!

   Now, here's an interesting problem I've been having.  Is it me, the 
SCSI bus, GS/OS, or something else? ...

   I keep all of my software, and diskettes backed up on multiple 
media.  In the case of my IIgs, it's on a spare HDD partition, Zip disk, 
and CD-ROM (after serial transfer to my PC for burning).

   The problem is that when I try to Unshrink a file directly off of CD 
(GSHK 1.1), most of the time, it'll bring up numerous CRC errors, and 
occasionally a fatal (to the decompression) error.  Now, copying those 
files to the HDD -partially- solves that problem.  However, it doesn't 
always...

    What makes the problem a mentionable one on here, is that identical 
files (from earlier CD backups, from the HFS partition, from a ProDOS or 
HFS formatted Zip Disk, from a serial-transferred version, or from a 
pre-existing SHK on my HDD), will sometimes exhibit this behavior, 
sometimes not.  Sometimes, all I have to do is re-unShrink the SAME FILE 
(even off of CD!) to get a successful decompression.

     I've used GS/OS to verify the ProDOS media, and it all comes up 
okay.  This is what caused me to recently reformat my main boot/apps 
partition, and try to (re)install all of my apps from scratch.

     I've even tried to "re-engineer" most of my archive files from the 
originals, or other sources that I have handy (such as earlier backups). 
 This is the fourth time, and it's gotta be something other than the 
serial connection (I use ZModem CRC in 32 bit mode, ProTerm 3.x).  This 
problem isn't going away, and I'm nearly at my wit's end.  (Why can't I 
ever have *simple* problems? LOL!)

Anyone have ANY idea what I'm doing wrong?  I've checked the FAQ and 
either I'm blind, or I came up dry...  Thank you all. :)

Take Care!
Josef

Hardware configuration:
  IIgs ROM 03, System 6.0.1 (recent reformat)
    GUPP 1.0.7
    RAMFast GS/OS driver from ROMdisk.
    Patched HFS.FST
  4MB RAM card (QRAM)
  (S3) ZipGSX 9Mhz, 32k cache
  (S7) RAMFast SCSI Rev. D:
       ID 0: "QDrive" 270MB
         "Grimm"      32MB ProDOS
         "Data"       32MB ProDOS
         "Archives" ~198MB HFS
       ID 1: Apple CD300i "MATSHITACD-ROM CR-8004" (ext. enclosure)
       ID 6: Iomega Zip Plus 100MB
         Variable ProDOS/HFS partitions

PC:
  Celery 400, Win98SE, 128MB/30GB, EZ-CD Creator 3.5c
    HP 8200i 4x burner