Various brands often have their own utilities for different tasks. Try going to the manufacturer's website and seeing what is there. I have found with others that the manufacturer is not necessarily the same as brand name.
If it is not being recognised and it used to then I think you may find it is, well, buggered. Unfortunately the big downside of flash RAM is that when data is lost, it is really lost, unlike spinning media in which the data may still be in blocks or sectors but if the file tables are corrupted/absent the data can still be retrieved and rebuilt.
Good luck 
Alan
Alan
2005 Disco 2 HSE
1983 Series III Stage 1 V8
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