SanDisk used to have a great program for password protecting its Cruzer flash drives. Using the U3 program, anyone without the password to a stolen/found Cruzer flash drive could not access its files in any manner.
"security" is not secure; access is tedious at best; encryption/unencryption is w-a-a-a-y slow; no way to password protect the whole drive; data is vulnerable to malicious deletion; company unresponsive to user complaints re above