GS/OS 6.0.1 system requirements?

Fron the Knowlege Base:

System Requirements
Standalone Apple IIGS System 6 software requires an Apple IIGS
personal computer with at least 1MB of RAM, ROM version 01 or 03 and
one 3.5-inch disk drive, although configurations of 2MB of RAM and a
hard drive is recommended for optimal performance. Networked systems
require Apple IIGS computers with at least 768K RAM, ROM version 01
or 03 and appropriate LocalTalk cables.
Exact memory requirement definition is rather dynamic because (like the
Macintosh OS) you can add a variety of extensions. This makes the size of
the GS/OS System file grow and shrink.

Bill,

I would dare say that you have a disk error. Remember that those machinces are totally disk driven. If it cannot load PRODOS, it probably is because it can not read PRODOS.

Make sure that you have a working copy, then use CopyII+ to make a backup.

Jim

HD disks use a different oxide than Double density. If you try to record the "wrong" format on them, they may appear to work fine, but your data can become unreadable in minutes.

Punching a second hole works especially badly.