Where did my external drives go?

I have 4 external hard drives plugged into my Mac and, one by one, upon restarting my computer, 3 of them got wiped. My 4th drive, which I use for TimeMachine, hasn’t been affected. The other 3 are no longer recognized by my Mac. I plug them in and it says “The disc you inserted was not readable by this computer.”
I thought it was a freak accident or glitch when the first one was unrecognizable. Then the other 2 went down. It happened each time I restarted my computer with the drives plugged in. I could easily restart my machine with 8 external hard drives plugged in when using Leopard. But with Snow Leopard it's not working.
All the content on my drives is still there, I just can't access it. Snow Leopard deleted the drive's Volume. Does anyone know how to recover/restore a Volume?
Any suggestions are much appreciated.
Thank you.
- Josh

Right now I have some data recovery software searching the drives for lost/deleted volumes. Once it's complete I'll "zap the PRAM and NVRAM," restart, and hook up the drives and see if that works.
@Dale Weisshaar, baltwo - Thanks!
@DaddyPaycheck - They're not daisy-chained. Between the 4 hard drives, they're connected to 2 USB2 hubs. After all this happened I did unplug them from the hub and connected them directly into the computer to see if they worked. Same error message occurred.

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