If the device is totally unreadable, even via windows, then obtain a new high-quality name-brand usb flash device and reinstall Unraid OS onto it, boot your server and get a new Trial key. You will need to reassign all your storage devices to parity-array and cache as you can remember. In this situation there are three rules:
Don't assign any device to Parity or Parity 2 unless you know that device does not contain valid data.
Don't assign any device to Cache or Cache pool until after you have your parity-array reconfigured.
Don't click any Format button.
For step 1, you can leave Parity/Parity 2 unassigned, reassign your data disks, and then Start array and you should see all the shares there. Later after you've figured out what devices were for parity you can go back and assign them.
Step 2 can be trickier, especially if you had a multi-device pool. In this case, going to command line and typing this may help with identification:
blkid
Once you have re-configured the storage devices correctly, all your shares should be ok, but if you changed any settings off their default, then you will need to go fix that.