Pinouts of Connectors

ST506/412 connector pinout

layout
schematic diagram
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Developed by Seagate. Also known as MFM or RLL since these are the encoding methods used to store data. Seagate originally developed it to support their ST506 (5 MB) and ST412 (10 MB) drives.

34 pin IDC MALE connector pin-out & layout
34 pin IDC MALE connector  at the controller

The first drives used an encoding method called MFM (Modified Frequency Modulation). Later a new encoding method was developed, RLL (Run Length Limited). RLL had the advantage that it was possible to store 50% more with it. But it required better drives. This is almost never an problem. Often called 2,7 RLL because the recording scheme involves patterns with no more than 7 successive zeros and no less than two.

Second connector: 20 PIN IDC MALE at the Controller.
20 PIN IDC MALE

20 PIN IDC FEMALE at the Harddisk.
20 PIN IDC FEMALE

Control connector

Pin Name Description
2 Head Sel 8
4 Head Sel 4
6 Write Gate
8 Seek Complete
10 Track 0
12 Write Fault
14 Head Sel 1
16 RES (reserved)
18 Head Sel 2
20 Index
22 Ready
24 Step
26 Drive Sel 1
28 Drive Sel 2
30 Drive Sel 3
32 Drive Sel 4
34 Direction In
Note: All odd pins are GND, Ground.

Data connector

Pin Name Description
1 Drive Selected
2 GND Ground
3 RES (reserved)
4 GND Ground
5 RES (reserved)
6 GND Ground
7 RES (reserved)
8 GND Ground
9 RES (reserved)
10 RES (reserved)
11 GND Ground
12 GND Ground
13 Write Data+
14 Write Data-
15 GND Ground
16 GND Ground
17 Read Data+
18 Read Data-
19 GND Ground
20 GND Ground

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34 pin IDC FEMALE connector pin-outs & layouts
34 pin IDC FEMALE connector  at the harddisk
Pinouts.ru > Pinouts of different harddrives connectors >  Pinout of ST506/412 connector and layout of 34 pin IDC MALE connector and 34 pin IDC FEMALE connector

Source(s): Hardware Book
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