loss of password facility

I hve used the security pass word with no problems.

I deleted a file which was protected, and the pass word facility seems to have gone as well.

How can I get it back or find it?

Maybe something in this posting will help you. 

http://forums.sandisk.com/t5/All-SanDisk-USB-Flash-Drives/What-can-I-do-to-save-my-lost-files-off-from-the-SanDisk-USB/m-p/300503#M5812

This link should be able to help you out too. 

http://forums.sandisk.com/t5/All-SanDisk-USB-Flash-Drives/repair-files-after-removing-cruzer-edge-USB-from-computer-during/m-p/232150#M978