Time machine and sleeping settings

Hello,
Since I upgrading to Snow Leopard I experienced some problems with my usb HD unit configured as Time Machine backup. I've noticed that in case Time Machine is started and my Mac goes sleeping or I turn it sleeping with the power button then the backup fails and all the following backups fail until I repair the disk with the Disk Utility. Do someone experienced the same problem? Do I have to consider it a bug of Snow Leopard or it's a problem that happened with my LG HD?
Thanks in advance,
Mariano

morianas wrote:
Hello James,
the drive is the one linked below (sorry, but found it from LG Italy):
http://www.lge.com/it/it-products/external-hard-drivers/LG-HXD2U32PW.jsp
Oddly enough, I can't find that (or any external drives) on the English language version of that site. All that's shown there are network drives, and DVD stuff. But yes, it does appear to be a standard sort of USB drive.
Anyway, the external HD is always connected by USB to my Mac and never disconnected without ejecting.
Furthemore, I assumed that powering the mac off using the main menu (as I always do) will take care to unmount all the disks automatically, won't it?
Yes, it should. Can you borrow a different USB drive somewhere temporarily, to see if the same problem occurs with it? If not, you may need to take your Mac and the drive to an authorized Apple repair location.
And/or, contact LG's support folks.
Sorry I can't be of more help, but this seems pretty unusual.

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