Can anyone direct me to some knowledge about accessing the MSX disk drive directly, without using BIOS?

I need to read/write entire tracks on disk without buffering/intervention of the BIOS. I know this is not the "official" way, but this is needed for a drive alignment program.

thanks and greetings from Brazil!

Direct access without the bios is not easy, because you have to program the diskcontroller directly. But there are various diskcontrollers used in MSX-land, so you need to figure out which controller is used. And you need different code for each controller.
The WD2793/WD1793 is frequently used in non Panasonic MSX computers (at address &H7FF8 mostly, sometimes at address &H7F80, sometimes at I/O &HD0). Panasonic MSX computers have the TC8566AF at &H7FF8, Panasonic MSX Turbo-R also has the TC8566AF, but at &H7FF2. May be future MSX versions use a different controller.....

So the bottomline: it is not easy, but it can be done.

yeah, but HOW TO was the question. I know, arjen, you're working on such routines already
why not share'm with alexandre. Alex Wulms (xelasoft) did simular with his fastcopy program, you can load different diskrom drivers. check that program!

greets, roman