FAT drives and EOS 4.7
The manual
seems to say that:
- internal IDE drives are not exposed on the SCSI bus and so are OK regardless of their formatting
- EOS formatted SCSI drives on the SCSI bus with a computer (EOS 4.7) are also OK
- FAT formatted SCSI drives on the SCSI bus with a computer are bad and will loose data
This makes sense to me if it's a 'drive controller' problem. The drive controllers in the sampler and in the computer are not designed to seek out and coordinate with other drive controllers on the SCSI bus, and they maintain their own copy of the FAT in RAM to speed up access. So any writable drive that is mounted by both the computer
and the sampler
at the same time will be at risk of loosing data because both controllers will write to the drive independently, overwriting changes made by the other. Of course the file allocation table - or FAT - is a file itself, albeit one only visible to the drive controller, stored in a protected area of the disc containing an index of all of the files on the rest of the drive. If two drive controllers try to take control of the same drive, they will both make changes to the FAT, corrupting this index. A bit like tearing random pages out of the index of a big encyclopeadia.
EOS formatted drives cannot normally be read by a computer, and thus are not normally mounted and as a consequence, safe. AFAIR Windows 95 is an exception - it will try to mount the EOS drive, tell you it's not formatted and offer you the option of formatting it! I believe there is a registry fix commonly applied to vintage computers running '95
Steve