My mac book doesn't no longer recognizes my wd  hard drive

running mountain lion 10.8.2 ...my macbook no longer recognizes my wed external hard drive is there a way I can fix this>
thank
Glenda

Since you haven't provided any helpful information all I can suggest is this:
Open Disk Utility in the Utilities folder. If the drive does not appear in DU's sidebar listing, then it most likely has died and needs to be replaced. Take it into Apple for service.

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