USB hard drive for Time Machine backup?

I'm looking for a USB hard drive that actually works with Time Machine. I have a Western Digital 320Gb passport HD. When I try to run TM, currently with Snow Kitty and previously with Leopard, TM seems to hang at 'preparing backup' and then I get error messages that the drive was unexpectantly removed, even though I didn't touch anything.
Assuming it is the portable Western Digital HD what is a good brand/make to use for TM backups. If the particular drive is not the problem, what should I look at?

Did you prep the drive before you started using it? Do the following:
Extended Hard Drive Preparation
1. Open Disk Utility in your Utilities folder.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID (for Intel Macs) or APM (for PPC Macs) then click on the OK button. Click on the Partition button and wait until the process has completed.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.

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