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Interrupt 13h - Disk Services

Date: March 18, 2003

This is not a complete or extensive list of Int 13h functions. It's only purpose is to give an indication of the kinds of functions that are performed by Int 13h.

Interrupt 13h (19) Functions
Function	Name	Call	Returns
00h	Reset Disk System	AH=00h AL=drive number 00-7F floppy disk 80-FF fixed disk	CF=0 (no error) CF=1 (error) AH=error code
01h	Get Disk Status	AH=01h	AH=disk status
02h	Read Disk Sectors
03h	Write Disk Sectors	Bob's Nuke	What it means...
04h	Verify Disk Sectors
05h	Format Disk Tracks
08h	Get Current Drive Parameters	AH=08h DL=drive number	Information
09h	Initialize Hard Disk Parameter Table	AH=09h	Nothing
0Ah	Read Long
0Bh	Write Long
0Ch	Seek to Head
0Dh	Alternate Disk Reset
10h	Test for Drive Ready
11h	Recalibrate Drive
14h	Controller Diagnostic
15h	Get Disk Type	AH=15h DL=drive number	AH=drive type code
16h	Check for Change of Floppy Disk Status	AH=16h DL=drive number	AH=00 (no change)
17h	Set Disk Type

IBM/MS Int 13h Extensions
Function	Name	Call	Returns
41h	Installation Check	AH=41h BX=55AA DL=drive number	CF=0 (success) CF=1 (no extensions) BX=AA55 (present) AH=extension version
42h	Extended Read (Reads disk sectors using LBA)	AH=42h DL=drive number DS:SI=disk address packet	CF=0 (no error) then AH=0 CF=1 (error) then AH=error code
43h	Extended Write (Writes disk sectors using LBA)	AH=43h AL=write flags DL=drive number DS:SI=disk address packet	CF=0 (no error) then AH=0 CF=1 (error) then AH=error code

A full list (from Ralf Brown's Interrupt List) of Interrupt 13 functions can be found here.

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Interrupt 13h (19) Functions

IBM/MS Int 13h Extensions