1541 Speed Test by Zibri - Need to diagnose an issue with your sick, well here's a tool that can help.  Although it seems straight forward, I highly recommend reading the documentation, especially if you don't want to bork the disk your testing with.

It's really nice when people put out quality software and share it with the world.  1541 Speed Tester is just such a program, and it deserves some more attention.  Please visit the software project page at https://github.com/Zibri/C64-1541-Speed-Test.  I also recommend visiting the authors web page at https://www.valoroso.it/regolare-il-commodore-1541-con-speed-test-by-zibri/