USB storage devices with only 100% encryption

["Ken S" <ken.securitylist () gmail com>]

I'm looking for secure USB storage devices with 100% encryption (e.g.
- no unencrypted "public" area).  I've found a couple, but most retail
drives allow a public area.

Any ideas on reliable vendors that only support 100% device encryption?

Also, what are you experiences with the portability of such devices?
Our execs need (want)  to take presentations with them on the road on
USB devices, so they need to work on machines that are semi-trusted
but on which they likely will not have administrative rights.

Bottom line:  I want to make sure the information on the devices is as
safe as possible from compromise when they lose them....

Thanks in advance for your insights.

Ken S