TDK USB Trans-IT Drive Lock up

[qanda]This question is published in the hardware section for the TDK TRANS-IT USB Flash Drive Slider 4GB. Click here to view full specs.[/qanda]I was using the TDK Trans-It 4GB flash drive and in the middle of acessing the drive the computer power went off and the drive subsequently locked. How do I unlock it ? I receive the message : “please insert a disk into removable disk F”. What was going wrong ? and how do I unlock it ?