Have you encrypted the drive or used it attached to a pc with hard drive encryption? If so you will likely only be able to access the drive from that machine.
If not try repairing the drive using FDISK X: /MBR from your command prompt, where X: is the drive letter of your external drive. There are other programs as well for repairing your MBR such as PowerQuest recovery tools. Check out http://www.pcrecovery.com/ they guarantee no loss of data.
WARNING some tools may render your drive unrecoverable so if you are not willing to take the chance you may need to send the drive to a recovery secialist.
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