Service Reference Guide, d500
336492-003
4–1
4
Serial and Parallel ATA Drive Guidelines and
Features
4.1 PATA and SATA Device Information
4.2 ATA Cables
4.2.1 SATA Data Cable
The SATA data cable is a thin, 7-pin cable designed to transmit data for only a single drive. As
shown in the table, each cable has 3 grounds, and 4 transmit/receive pins.
Characteristic
PATA
SATA
Number of pins/conductors in data cable
40/80
7/7
Number of pins in power cable
4
15
Maximum data cable length
18 in (45.7 cm)
39.37 in (100 cm)
Data interface voltage differential
5 V
600 mV
Drive motor voltages
5 V, 12 V
3.3 V, 12 V
Jumpers for configuring drive
Required
N/A
Data transfer rate
up to 100 MB/s
150 MB/s
Pin Number
Usage
Device Plug
Host Plug
P1
Ground
Ground
Ground
P2*
A+
Transmit data
Receive data
P3*
A-
Transmit data
Receive data
P4
Ground
Ground
Ground
P5**
B-
Receive data
Transmit data
P6**
B+
Receive data
Transmit data
P7
Ground
Ground
Ground
*P2 and P3 differential signal pair
**P5 and P6 differential signal pair
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