Hi, You could use Dekart Private Disk Light, it doen't protect individual folders, but instead creates a virtual encryped drive, in which you store data. Once you enter the password you use the drive as a normal drive. I have been using it for ages and it works very well and is easy to use. I presume your external drive uses fat32, so you will be limited to a maximum virtual drive size of 4GB. It's freeware, 280k download. Just don't forget your password.......... click here
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