Time Machine Backs up Macbook, then tells me to format the external drive

I have a new Macbook and have a 160GB Maxtor External Hard Drive plugged in through a powered USB Hub.
I sorted Time Machine Yesterday and everything backed up fine, and did its small hourly backups until i put my Macbook to sleep.
Turned the Macbook off this morning to move it, and when everything was reconnected and turned back on tonight, i got an error as soon as OSX booted.
It told me that the drive used for Time MAchine should be backed up and formatted immediately, otherwise it would lose everything. Time MAchine backup then failed.
After ejecting the drive, rebooting etc, the error message was still there.
I am now going to format and try Time Machine again, but does anyone have any ideas why this would be happening?
Thanks

Whoa mate; what's the original issue.... :O What is iTunes NOT doing for your device.

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