Does Time Machine and Sleep Mode work with your external USB HD???

I have a new iMac 10.7.3 with latest software updates.
Do you have an external USB hardrive that works with Time Machine turned on and Energy Saver set at 10 minutes on the computer???
If so which external USB HD are you using???
So far I have not found one that works correctly. They seem to corrupt the external USB HD requiring a reformat of the drive each time.
I need to buy one that works.
Tom..........

I am presently using four different brands of external drives with Time Machine on different Macs:
Seagate
Iomega
Western Digital
Maxtor (this is an old Firewire 400 drive)
I never configured any of these drives specially for sleep or spin down. I just formatted them and then used them with Time Machine. The computers are set to sleep after various idle times raging from 10 minutes to 20 minutes. The box for "put hard disks to sleep when possible" is also checked.  Two are laptops and two are iMacs.
I have never had any issues with any of these drives, and they've been used with Time Machine for over two years in some cases. That corruption you mention sounds unusual.
Did you format the drives for use with a Mac before connecting them up for Time Machine? For instance, Mac OS Extended and GUID partition table? Some PC formats won't work, for instance If you select an NTFS or FAT-formatted drive, Time Machine prompts you to reformat the drive. If you have one of these, reformat the drive in Mac OS Extended (Journaled) format.
I am suspecting you have a drive with one of the PC formats that isn't compatible with Time Machine.

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