Drives Eject on Sleep

Hi,
When I sleep my iMac, some of the drives eject. When I wake my computer I get the improperly ejected warning dialog. I don't have the "Put Hard Disks to sleep" check enabled. What's going on?

Since this is related to power management (seems like power is being cut off from the drives too early), I would first reset PRAM
http://support.apple.com/kb/HT1379
and if that does not help, reset SMU
http://support.apple.com/kb/HT1767
which is basically disconnecting the iMac from power and reconnecting it following a precise procedure.
Are you sure you have an iMac G5? I ask because it says your OS is 10.6.1, which does not run on a PowerPC iMac (such as a "G5"). If your iMac is Intel, this is the correct procedure for resetting the SMC.
http://support.apple.com/kb/HT1543

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