MemLocker

MemLocker is a security software for Windows Mobile Devices (PocketPC). It automatically locks your SD and other external cards when your device is switched off.
Every time when you’re switching off your PocketPC MemLocker automatically locks all inserted cards.
This operation is extremely fast and usually takes less than one second.
If locked card is inserted into card reader it doesn’t contain any files or folders.
Nobody can see your files on memory cards without your permission anymore!
All locked cards will be automatically unlocked when you’re switching on your device. This is absolutely transparent for you. All what you need to do is to install MemLocker and set up a password for device.

DriveCache

DriveCache is a cheep and effective solution for hiding your files and folder. Using DriveCache you can create a Cache (secret storage) on any NTFS disk except disk C:.
It may be as local as portable drive. You can open cache and use it as a generic drive: install software, create folders, copy files, etc.