What external hard drive is compatible with Mountain Lion?

Mountain Lion is no longer recognizing the external hard drive I was using for Time Machine --
WD My Book Essential 3.0 WDBACW0020HBK.  What is a good external hard drive to use with Mountain Lion?

As Shootist007 said, go to /Applications/Utilities/Disk Utility.  Select the drive you want to reformat in the Disk Utility Sidebar and make sure it say's Format : Mac OS Extended (Journaled). If so, simply hit the Erase button. Once that's done go back to Time Machine and reselect it if needed.
If you continue to have problems with the drive, I've always used OWC drives with few issues.  Others use Lacie drives.

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