How to lock a folder on a USB drive?

Question

I have a requirement to implement a feature (in C#) to lock a folder on a USB drive. After locking, in any PC without my software, this folder is inaccessible (or better inv

Answer 1

For the data to be inaccessible, you would need to create an encrypted container which your program would represent as a virtual folder on existing disk or a virtual disk (drive letter). The first is possible with Pismo File Mount, the second - with our product (Solid File System OS edition). Both approaches require installation of the kernel-mode driver to the system. This is not an application requirement but OS architecture requirement.

From technical point of view our approach is more robust because Pismo File Mount uses a filter driver, while SolFS uses a file system driver and filter drivers are more complicated and more prone to compatibility issues (we have filter-based product as well, so I have experience with both approaches).

(Note: TrueCrypt has nothing to do with C#. So that isn't applicable here.)