Time Machine loses iOmega drive

4 20" iMacs with iOmega 500 GB USB drives attached. Macs were upgraded to Leopard and the iOmegas were purchased from Apple for use with Time Machine. The computers are set to shut down at a predetermined time and the external iOmegas are set to be on 24/7. Sometimes, when the computer starts up, the iOmega drive won't mount and Time Machine can't find it's designated hard drive. If I turn off the iOmega, the Mac then can see it and Time Machine begins working. System Preferences are set so that the hard drives do NOT sleep. Any ideas??

When you say
If I turn off the iOmega, the Mac then can see it and Time Machine begins working.
do you really mean "turn off" or did you mean to say "turn off and then back on" ?
It sounds like when the system shutsdown the iOmega HDs also shutdown and do not startup or power-on when the Mac is powered up.
You need to obtain the iOmega HD specifications from manufacturer's help desk or web pages or contact AppleCare to see if the iOmega HD can be configured to not act this way. Maybe you will need to return these iOmega HDs to Apple store if they cannot be made to behave differently.
None of my USB nor FW externals act this way.
What you've done for your config and system shutdown/startup sequence is exactly what I would have done also.
Can you maybe sleep the Mac rather than shutting them down. The energy while sleeping while not at zero is pretty darn close to zero.
Can you say if the iOmega HDs are powered-off just before you startup the Mac.
Maybe before you startup the Macs you need to power cycle the iOmega HDs. A few extra switches to press but not so much more effort.
Post back.

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    getwellroad 
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