1541 Diagnostic Cart v1.0
This is a group of 1541 disk drive utilities put together into a cartridge format on WORLDOFJANI
The BEST part is that it is FREE, you do NOT have to buy this from Ebay, just download the ZIP file from the above link. THEN upload the .CRT file to your EasyFlash3 cartridge.
I love the Fast FORMAT utility on this and use it often. Also the Speed Check is nice.