I agree with Bernie, I'm using a San Disk Cruiser and it has worked flawlessly. Mine is 1 gig, I have 1100 plus scanned about a quarter of them more than 2 pages long and I'm still using only 297 MB of the actual 976 mb that are on the stick. I don't see myself running out of space anytime soon. If I were using the MP3 capability of the v4 of then a large stick that would be in order