I happened to format my Toshiba 8GB over the command prompt. It failed.
I used the /x in my command so it read like this:
format F: /FS:NTFS /x
whereas the drive letter is F. the /x is for unmounting the usb first. Since it failed, the drive was left unmounted.
I restarted the computer, plugged out and back in, reinstalled the drivers
. The Disk Status reads "No Media" and Size reads 0 bytes in diskpart. Testdisk does not even display the drive since it's 0 bytes. Disk Management does not display any partitions, so all right click actions are greyed out. Changed the drive letter, still didn't work. Double click the drive from My Computer says: "Please insert a disk into Removable Disk (drive letter)" And the drive logo is greyed out, most likely because it's offline.
The HP Disk Formatting Tool didn't work because of no media error.
And the disk was not exposed to heat or any kind of damage, the problem is software. I solved this before but now I forgot how.
There is no data inside so if you have a last resort force formatting tool that would work.