Recovering Data from A WD External Hard Drive

I have an older IMAC 20 2007- Leopard 10.6 installed and running great. I have a 1tb WD hard Drive via FireWire and a 2tb hard drive via USB 2 as there is no Seta hook up on the IMAC. I also have a 500Gig WD external hard drive that has a lot of saved movies and programs on it. I Want to recover the movies on the 500 Gig. to the 2 tb or teh 1 tb hard drive. The problems is, when the IMAC recognizes the 500Gig Hard drive it will not copy the movies over as it says "they are in use and cannot be copied" OR the IMMAC will not recognize the 500Gig drive at all, it says the hard drive is not recognized. The movies were copied to that hard drive with the IMAC Why can I not recover them from the Hard Drive? I assume that the hard drive may be on its way out. Does anyone know how to recover those files? Mostly Movies MP3s and some programs. Thank you

Install OS X for emergency use so you can do repairs and maintenance, on another drive.
Some iMacs can, at least now, maybe retrofitted, have an eSATA controller added. Yes, shame there is no ExpressCard slot of native external SATA ports.
USB2 is slow and terrible interface for today's drives, real need for USB3 drives.
Tried Data Rescue 3 demo?
How about a full volume clone operation with SuperDuper or TriBackup 5, or Carbon Copy Cloner?
WD MyBook units can be Mac-unfriendly and trouble, there are Mac specific models of WD MyBook or there are other makes that do work, usually use the Oxford chip bridge to provide USB/FW/eSATA.
Maybe there are errors with file system, data, or even the drive directory causing problems.
Do the external drives have their own power supply? should.

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