have you looked in the Disk Management console?
Sometimes Windows fails to assign a drive letter, you can assign one manually in Disk Management. If that's not the issue, you should test the drive to see if it has failed, since if it has you would just be wasting your time trying to revive it. A failed drive is history.
Most drive manufacturer's have their own diagnostic software which you can download free of charge, but Fujitsu does not seem to have such software. In that case, you can use Seagate SeaTools for Windows instead, which is here:
| Seagate
Sometimes Windows fails to assign a drive letter, you can assign one manually in Disk Management. If that's not the issue, you should test the drive to see if it has failed, since if it has you would just be wasting your time trying to revive it. A failed drive is history.
Most drive manufacturer's have their own diagnostic software which you can download free of charge, but Fujitsu does not seem to have such software. In that case, you can use Seagate SeaTools for Windows instead, which is here:
| Seagate