I am sorry you encountered this issue with your Intel® SSD 320 Series.
It depends if you had enabled the hardware encryption with a SATA/HDD password in BIOS.
If you did so, then I am afraid it is impossible to recover the data. If you did not, you may try with another data recovery company that has a partnership with Intel; so, the warranty will not be voided.
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Dear Joe, thanks a lot for getting back.
If I could take a few moments more of your time.
I did not knowingly enable the hardware encryption, but I suspect that someone must have done (manufacturer? reseller?), because the Hungarian disk-recovery company I mentioned, Kurt, (KÜRT – Data Recovery and Information Security) referred to this term of hardware encryption.
By "impossible", do you mean theoretically impossible (I mean, like a square with no corners), or practically impossible, like it would take all the worlds computer power for the next 5,000 years, or ... like technically impossible, in that today we don't have the machine but you could imagine one that could recover the data?
I was wondering if it is possible to extract the encrypted data from the drive and hold it elsewhere?
Talking to a friend who is fairly knowledgeable on encryption theory, he said that if you know what is on the disk in some detail, then it makes the decoding job an order of magnitude easier. As I have copies of about a third of the content, I guess someone at GCHQ / CIA level would be able to crack it.