My guess is that the HD was initialized with a later version of HD SC Setup, or more likely, Drive Setup (which was the successor to HD SC Setup).I would try initializing it with Drive Setup. Now, IIRC, Drive Setup may not run under OS versions before 8.
If this is the case, just go ahead and do a clean install of 7.5.3 on the 605--you don't need to reinitialize the HD in order to install a new OS on it.
Matt
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Permanent 68k roommates:
- "Mystic" Color Classic, full '040, 36/700, OS 8.1
- Q605, full '040, 36/1.2G/enet, 8.1, Debian Woody
- Q605 overclocked to 33MHz, full '040, 20/1.2G/enet, 7.6.1, NetBSD