|Sorry to tell you this but if you have a Sony Viao flash drive it is a fake. Sony only uses the Viao name for it's notebook computers, not flash drives. The drive has been modified to show a much larger capacity than it actually has which may be 1 GB or less. Data stored on the drive will be gone or corrupt. The only alternative is to purchase a replacement from a reputable source.|
See this article for more information:
Note that the article mentions 128 and 256 GB drives but also applies to smaller drives and those not purchased from eBay.
Note that flash drives are the least reliable of modern storage media and should not be trusted for long term storage of important data. They are intended primarily as a transport media, not primary storage. You should always have a copy of important files on different media. This applies to all important files, no matter what they are stored on.