My Passport 2TB - Macbook - Data loss - Drive not locking - Can I recover?

When My Passport Studio drive USB is connected to iMac, both WDUnlocker and Passport icons appear, but drive is always unlocked.

 It used to be locked and requried password for access. Now, no files show on the drive.

Lost four or five IPhoto librarites. Any suggestions for recovery of these photo files?  At least 20 - 30 GB.

Running OSX SnowLeopard, no changes in OS recently. No other users of system.  

Disk Utility reports no problems with drive.

Welcome to the Community.

This is most unfortunate, and on such cases it’s best to contact a specialized Data Recovery service for analysis:

http://support.wdc.com/recovery/index.asp?wdc_lang=en