Unable to access pasword protected USB Drive

[Carruthers]

I have a TDK Media Trans-It p/w protected USB drive.

Whenever I attempt to unlock it, it says 'Drive is busy, unlock failed, please try later'.

I can't see why the system 'thinks' that the drive is in use, there's nothing apparent, so I'm becoming rather worried.

There's a whole load of financial records on there and it would be a pain in the fundament if the problem persists.

Any advice would be gratefully received.

Ta!