Drive Ejected after Sleep

Today when I pulled my iMac out of sleep I got a pop-up box saying the my time machine FW drive had been not ejected properly. Now this has happen before, but not often, it may only happen if I have quit ALL applications before putting to sleep.
So is there a) anyway to stop it ejecting the drive or b) auto mounting all drives on wake-up.
Mark

Disconnecting and reconnecting the hard drive from the USB connection will mount it again. However, I am not sure how to keep a USB hard drive mounted through a sleep/wake cycle -- I'm trying to find that out myself! I believe the stern warning should be no cause for alarm, though; no data is being read/written from the drive during sleep so no data corruption should ever occur when the drive becomes unmounted this way.

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