I have 4; all sandisk (bought 'em from work and we only carry the Sandisk ones lol). 256MB Cruzer Micro (the one with the cap); 1GB Sandisk Cruzer Micro, 2GB CM, and a 4GB CM. The 1GB, 2GB and 4GB ones I have are all th eones that slide into each other. I took the U3 software off of all of them because it just annoyed me...if I want it back on there I'll just have to go to their website/put it on so no biggie, lol. The 256, 2GB and 4GB I have documents/other stuff on, and the 2GB I have Linux on (can't remember which distro...may be DSL, could be a diff one lol, not sure).