Great, so it isn't what I suspected it might be. (Those 1TB & 2TB thumbdrives sold at very low prices are fakes with only a fraction of that capacity and become unusable if you exceed their real capacity).
It could simply have failed after 5 years use, especially if it's in regular use.
Flashdrives drives don't last forever, they have a maximum number of write cycles.
More info: <a href="https://www.usbmemorydirect.com/blog/how-long-do-flash-drives-last-usb-drive-lifespans/" ipsnoembed="true" rel="external nofollow">https://www.usbmemorydirect.com/blog/how-long-do-flash-drives-last-usb-drive-lifespans/</a>
Could you post a screenshot of the properties, in particular showing what the File system is, eg:
You say that it shows zero Free space, but what does it show for Used space?
This is a working 2GB thumbdrive that is formatted to the FAT file system:
![image.png]()
If however yours shows something like this:
![image.png]()
Then that indicates that for some reason it has become RAW - ie. unformatted/unpartitioned. (No space used or free)
Although I would expect Windows to be asking you if you wanted to format it if that was the case.
Some third party partitioning tools can change a RAW partion to a useable partition without losing any data that is on the drive.
It's not something I've ever had to do, but here's the process in one such tool (there are others) - have a read of the article, there are various ways of doing it although some will lose the data: <a href="https://www.partitionwizard.com/partitionmagic/convert-raw-to-ntfs.html" ipsnoembed="true" rel="external nofollow">https://www.partitionwizard.com/partitionmagic/convert-raw-to-ntfs.html</a>
(Just as an aside: do you use Linux? If so is there any chance that you might have formatted the drive to a Linux format so Windows can't read it?)
If it isn't RAW (or if you convert the partition but lose the data) then you could give Recuva a try to see what it can find and get back from the drive, the Free version is all you need and does exactly the same job of recovery as the paid for version.
https://www.ccleaner.com/recuva
https://support.piriform.com/hc/en-us/sections/360010251491-How-to-use-Recuva