Tech Journal Back to Tech Journal

What is the pinout for laptop hard disk drives?

pin     assignment      pin     assignment
1 -Reset 2 GND
3 Data 7 4 Data 8
5 Data 6 6 Data 9
7 Data 5 8 Data 10
9 Data 4 10 Data 11
11 Data 3 12 Data 12
13 Data 2 14 Data 13
15 Data 1 16 Data 14
17 Data 0 18 Data 15
19 GND 20 Key (no pin)
21 (reserved) 22 GND
23 -IOW 24 GND
25 -IOR 26 GND
27 IO Chrdy 28 Ale
29 (reserved) 30 GND
31 IRQ14 32 -IOCS16
33 Addr 1 34 (reserved)
35 Addr 0 36 Addr 2
37 -CS0 (1F0-1F7) 38 -CS1 (3f6-3f7)
39 -Active 40 GND
41 +5VDC (logic) 42 +5VDC (motor)
43 GND 44 Type (0==ATA)

For desktops (40 pin connector) the master/slave jumper pinout is definitely nonstandard; check your disk to see if the scheme is printed on it. Otherwise track down the documentation for your disk.

For laptops (44 pin connector) the master/slave jumper scheme given below seems to be pretty common, although I wouldn’t be surprised to find others. Looking at the pins, we have:

			 v
...................... .. device 0
............ ......... .. i.e. master

v
...................... .| device 1
............ ......... .| i.e. slave

v
...................... .. cable select
............ ......... ==

Taken from: http://www.av8n.com/computer/htm/disk-pinout.htm

Last updated on 2008-01-12 09:49:00 -0800, by Shalom Craimer

Back to Tech Journal