Technical information about hard disks

Eric Auer uncovered this store of information about hard disks. Useful for anyone working on a DOS program require low-level access to the hard drive.

Hi, a tester reports that FreeDOS FORMAT 0.91o only reaches 400k/s (maybe 800k/s with UDMA) for the hard disk surface scan and wiping. I think I cannot make that as fast as some other tools like MaxLLF, which just wipe the disk with max. UDMA speed (can be 10s of MB/sec!) and assume correct sectors if the write does not return an error (question: Does write to a broken harddisk sector always return an error? Then I could leave out the read part of the surface scan to gain speed...).

I link the 6 vendors directly: