INT 13 - HARD DISK - RESET HARD DISKS AH = 0Dh DL = drive number (80h = first, 81h = second hard disk) Return: CF set on error CF clear if successful AH = status (see AH=01h) Notes: reinitializes the hard disk controller, resets the specified drive's parameters, and recalibrates the drive's heads (seek to track 0) not for PS/2 ESDI drives SeeAlso: AH=00h,INT 21/AH=0Dh .