Macintosh LC III: Two Apple hard drives not auto-mounting. Why? Solved

Sat, 02 Sep 2023 08:31:08 -0700

So I have these two drives: a 1GB IBM DPES 31080S. It’s marked with the Apple logo and it was the (perfectly working) internal drive of a 7500/100. I use it now as an external drive. SCSI ID is correctly set on both drive and case. It’s formatted as Standard since I’d like to use it on an older LC III and install an OS 7.1 or 7.5. Fact is, it won’t auto mount on the 7500, and it won’t even get recognized on the LC III, thus preventing any installation.

Same thing happens with a 350MB Apple Quantum ProDrive LT.

I’ve been fighting the whole day on my 7500 running OS 9.1, using HDSpeedTools and other vintage software in order to format it, take over the driver etc. Nothing seems to solve the issue and I don’t want to give up and use them as external drives, manually mounting them every single time! Drive Setup “sees” them, of course. I can format them, mount them, when I trash them it even tells me “the disk will reappear bla bla”, but they don’t. *sigh* There MUST be a way to get these bummers to show up and mount when they get power.

Any help is highly appreciated.

⟐ Answer accepted September 02, 2023 at 8:31 MST

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Macintosh LC III: Two Apple hard drives not auto-mounting. Why? Solved