An iMac DV 400 MHz (slot-loading), upgraded from its stock 10Gb HD to a Maxtor 6Y160PO (160 Gb HD).

The Maxtor was partitioned for OS 10.3 and OS 9.2.2. Checked RAM-specs (with "DIMM First Aid") and upgraded firmware before OSX as specified by Apple.

This HD setup worked well for a few months, though the built-in CD-ROM didn't respond properly anymore. The owner mainly use an external CD-drive anyway, so checking this out wasn't a big priority for my overbooked Mac support time.

But now suddenly the machine won't boot from the HD, but boots OK from CD (in the internal drive!). Disk First Aid in OS9 can't see the HD at all. Disk Tools on the 10.3 install disk sees the drive, but all Verify and Repair-buttons are greyed out. The HD doesn't show up in Startup Disk control panels (neither in OS9 nor 10.3)

The CD-ROM trouble made me think I had done an error in setting Master/Slave. But now I wonder; OS9 Disk Tools shows the following:

            Type     Buss     ID    LUN
HD       ATA        2         0        0
CD       ATAPI    2         1        0

The ID shows the master/slave setting, doesn't it? In that case they are different. What is that LUN thing?

Planning on disconnecting the internal CD to see if we can get to the HD - which of course is far from fully backed up... But it's a real hazzle taking these compact iMacs apart, even with Apples manual.

Any ideas about whats happening here? Anything I can do before digging out the screw drivers?


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