I just bought a replacement Hard Drive (60 gig) to replace my 20 Gig Maxtor. I partitioned the new drive in 3 equal sized partitions (just like my previous one), installed OS 9.0.4 in all 3 partitions, updated the System folders to OS 9.1 and restarted. Only one partion will start up. When I select any of the other two system folder to start up from (Startup Disk control panel), my iMac restarts, Hard Drive spins up but the screen remains gray. No folder Icon with question mark blinking or anything. I've re-initialized the Hard drive 4 times and I keep getting the same result. I've done this with all my previous Hard Drives and never had any problems. Could it be that my new Hard drive is too large ? Heeeeeelp !

20/3 = 6.66666666 60/3 = 20. 233MHz iMac. Sort of a long shot, but with OS X, that Mac requires the partition on which OS X is installed to reside entirely within the first 8GB of the disk. It isn't a known issue with OS 9, but it might have something to do with the behaviour you're seeing. Of course, I assume the HD is seen normally, and formatting/partitioning goes fine, etc. etc. etc.... p

Yes, it sees the hard drive partitions just fine. Everything, including the install went smooth so maybe you are on to something. Are you saying I should partition so that I have at least two partitions under 8 Gig in order to install 2 Systems ?

Do you have the drive set to Master? If you are installing OS X, it will need to be installed in the very first partition, which needs to be less than 8 GB. It doesn't matter for OS 9. d