Explanation of the DRIVPARM command. It is CONFIG.SYS.

This command defines parameters for block devices when
MS-DOS starts up.

Example:
       Suppose your computer has a tape deck defined as drive D
       and that drive is defined to write 20 tracks at 40 sectors
       per track, but you want to change this to writing 10 tracks
       at 99 sectors per track. You would just include the following
       line in your CONFIG.SYS file:
           drivparm=/d:3 /f:6 /h:1 /s:99 /t:10