Can't see external hard drive after error code -36

Hi, was copying iphoto data from an WD My Passport 750GB external hard drive to my MACBook when the system said it could not complete the copy as it had encountered a problem and indicated error code -36.  Now I can't see the external drive (or any data) on any computer.  I have tried 3 different MACs to no avail.  The drive makes a soft beeping noise but then stops but the light stays on.
Any ideas on how I can get access to my data??

Make sure the cable is securely seated on the device side.
If that's not the problem, then either the drive mechanism or the enclosure has failed. If you don't have backups, you'd better hope it's the latter. Remove the mechanism from the enclosure and install it another enclosure. You can buy fairly inexpensive USB docks that a SATA drive drops into with no need for disassembly.
Failing that, your only chance is to send the drive to a recovery service such as Drive Savers. They disassemble the drive mechanism in a clean room and mount the platters in another drive. Cost will be in the 4-5 figure range, and the results are uncertain.
If you don't have backups, you don't have data.

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