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Related problems with early iMacs
Authored by: lstewart on Sep 19, '01 06:04:23PM

It's not quite the same, but I discovered some related problems with early (revision A) iMacs, and they're not as well documented. So by way of information, hopefully this will help someone sometime...

Namely, all bootable partitions of rev.A iMacs must *start* within the first 8GB of the disk. Partitions can cross the 8GB boundary and still be bootable, but if a partition starts above 8GB, it will not boot (for OS X or Classic--nada).

Of course, this is only an issue if you have replaced the original 4GB drive in the rev. A. I put a 13GB hard drive in, and at various times I've had between 2 and 4 partitions on it. The above rule has always been true. Right now I have 2 partitions, a 7GB (OS X) + 6GB (classic), and both are bootable. When I had 4(classic) + 3(OSXS) + 3(LnxPPC) + 3, the first 3 partitions were bootable but the last was not.

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Related problems with early iMacs
Authored by: mzajac on Sep 25, '01 06:05:59PM
A similar problem affects same later iMacs too. In an iMac that came with an 8GB or smaller drive it seems the system has to be within the first 8GB. It may only affect Mac OS 9.x. A friend of mine had installed a large hard drive in his Lime iMac. It worked fine for months, but after doing a clean install of 9.1, his computer booted into Open Firmware with an error message. The solution was to reformat & partition the drive, and reinstall the system on the first 8GB partition. This is dealt with in Apple's Knowledge Base article #25249 'iMac: Gray or White Screen After Hard Drive Upgrade.'

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