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 INT 13h, 00h    Reset disk system
 INT 13h, 01h    Status of disk system
 INT 13h, 02h    Read sectors into memory
 INT 13h, 03h    Write sectors from memory
 INT 13h, 04h    Verify sectors
 INT 13h, 05h    Format track
 INT 13h, 06h    Format track and set bad sector flags (XT,port)
 INT 13h, 07h    Format drive starting at given track (XT,port)
 INT 13h, 08h    Get current drive parameters (XT,AT,XT286,conv,PS)
 INT 13h, 09h    Initialize two fixed disk base tables (XT,AT,XT286,PS)
 INT 13h, 0Ah    Read long (XT,AT,XT286,PS)
 INT 13h, 0Bh    Write long (XT,AT,XT286,PS)
 INT 13h, 0Ch    Seek to cylinder (XT,AT,XT286,PS)
 INT 13h, 0Dh    Alternate disk reset (XT,port,AT,XT286,PS)
 INT 13h, 0Eh    Read sector buffer (XT,port,PS)
 INT 13h, 0Fh    Write sector buffer (XT,port,PS)
 INT 13h, 10h    Test for drive ready (XT,AT,XT286,PS)
 INT 13h, 11h    Recalibrate drive (XT,PORT,AT,XT286,PS)
 INT 13h, 12h    Controler ram diagnostic (XT,PORT,PS)
 INT 13h, 13h    DRIVE DIAGNOSTIC (XT,PORT,PS)
 INT 13h, 14h    CONTROLLER DIAGNOSTICS (XT,PORT,AT,XT286,PS)
 INT 13h, 15h    Get type (AT,XT2,XT286,CONV,PS)
 INT 13h, 16h    Change of disk status (AT,XT2,XT286,CONV,PS)
 INT 13h, 17h    Set type (AT,XT2,XT286,CONV,PS)
 INT 13h, 18h    Set media type for format (AT model 3x9,XT2,XT286,PS)
 INT 13h, 19h    Park heads (XT286,PS)
 INT 13h, 1Ah    ESDI FIXED DISK - Format unit (ps)
 INT 13h, 1Bh - ESDI FIXED DISK - Get manufacturing header
 INT 13h, 1C0Ah - ESDI FIXED DISK - Get device configuration
 INT 13h, 1C0Bh - ESDI FIXED DISK - Get adapter configuration
 INT 13h, 1C0Ch - ESDI FIXED DISK - Get pos information
 INT 13h, 1C0Eh - ESDI FIXED DISK - Translate rba to aba
 INT 13h, 1Dh - IBMCACHE.SYS - Cache status
 INT 13h, 20h - DISK - ??? (western digital "super bios")