Hi all,

You probably don't need to reformat the disk with HD SC Setup. Just click the "Update" button in it. That will replace the disk driver installed by Drive Setup with it's own one. There's a good chance that the volumes will mount after you do this.

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Wow, that did the trick! Thanks a lot! I updated (actually downgraded) the disk driver with Apple HD SC, and all four volumes mounted straight away. No need to reformat nor to copy back several gigabytes to that slow disk. The only things I lost in the process were my custom disk icons.

Any chance that you've initialized the drive as HFS+ ?

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No chance... as was clearly stated in my original post. ;-)

But thanks for asking! 8)

By the way, I recently tried by mistake to mount a HFS+ volume, which was most certainly formatted using 8.6 or 9, on an older system, and it indeed showed the small partition with the ReadMe file indicating to upgrade to 8.1 or later.

Well, once again thaks a lot to all of you! I now have a working 6 GB "vintage usb stick" to sneakernet files around the collection!