08-21-2017 12:35 PM
I have a brand-new Sandisk 64 GB Ultra thumb drive.
08-21-2017 01:47 PM
the partition may be corrupted. go to disk management and see what it says about the partition and file system. you can try deleting the partition from there and recreating it then format the drive and assign a drive letter.
if that does not help you could use the diskpart - clean command from the command line.