If the drive is not detecting at all then the controller chip inside has failed. The best way you can recover this is to find another identical unit and remove the memory chip (it will be the larger of the two) from both drives and solder the one from the faulty drive into the donor, you will need soldering experience and a hot air gun to remove the chips (do not head these up too much, only enough to melt the solder) You will ideally have a electronics microscope to see the small pins that will be soldered. If this sounds like too much work, you could send it off to a target="_blank">Digital Recovery
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If the drive is not detecting at all then the controller chip inside has failed. The best way you can recover this is to find another identical unit and remove the memory chip (it will be the larger of the two) from both drives and solder the one from the faulty drive into the donor, you will need soldering experience and a hot air gun to remove the chips (do not head these up too much, only enough to melt the solder) You will ideally have a electronics microscope to see the small pins that will be soldered. If this sounds like too much work, you could send it off to a target="_blank">Digital Recovery