_ Dear member of SanDisk Community, welcome. _
I apologize for the delay, in answer you, I hope, be of equal useful.
What happened, is that your message, is lost in another thread, on another subject, and I saw it casually, and caught my attention.
1- I assume, of course, that already revised drivers, and tested the UFD, in other PCs.
The simplest solution is to return it, you have a guarantee: http://www.sandisk.com/about-sandisk/contact-us/
2- Meanwhile, you can investigate, whether any of these portable utilities (free), can detect your UFD:
- USB Flash Format (HP) 2.23
- USB Flash Repair (LLF) 2.91
- USB Flash Fbinst Tool 1.60
- USB Flash BootICE 1.32
For no lose more time, you can download (free) from here: http://filecloud.io/_cpweb34i
Luck, and then you tell us, what happened, please.
Regards, Alfred. (Google translated)