It's not a good idea to use ext2/3 or ntfs on a flash drive.


Instead use JFFS2.
This filesystem is designed for flash drives and prolongs the service life of the flash drive by using some sort of software wear leveling.

The 256 MB partition on a N8x0 device is using JFFS2 by default.
So the kernel on the device should be able to read the filesystem out of the box.