The only thing you can realistically try is to put it in your Mac and see if Diskutil will see it - this can often see drives even when they are not mounted. If it can you can try a repair. This assumes that there is only something wrong with the format / file structure.
If that doesn't work then try a program called Disk Drill - a piece of Mac software. You can use a free version to see if any files are recoverable, and then buy it if they are to do the recovery. I have't used it, but I've seen an early review of it in Macworld that gave it a good rap.
If there is something wrong with it electrically then you are probably screwed. Data recovery is hugely expensive........
cheers
Gary
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