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Deskstar 3
Electrical interface specifications

Models: DAQA-32160, 32700, 33240

Connectors

There is a choice of 2 power connectors to this drive. One DC power connector is designated to mate with AMP part 1-480424 (using AMP pins P/N 350078-4). The other (3 pin) DC power connector is designed to mate with Molex 5480-03 (using Molex pins 5479). Equivalent connectors may be used. Pin assignments are shown below, as viewed from the end of the drive.

IDE signal connector

The drive uses single-ended drivers and receivers. The connector is designed to mate with 3M part 3417-7000 or equivalent.

Note: It is intended that the hard disk drive should only be in electrical contact with the chassis of a designated set of mounting holes. Other electrical contact may degrade error rate performance. As a result of this it is recommended that there should be no metal contact to the hard disk drive except at the mounting holes or the side rails into which the mounting holes are taped.

Cabling

The maximum cable length from the host system to the drive, plus the circuit pattern length inside the host systems, must not exceed 18 inches (45.7 cm).

For higher data transfer application (>8.3 MB/sec) the cable length should be shorter than 18 inches (45.7 cm) since data transfer characteristics depends on the driver circuits of the system and hard drive, and or cabling.

Signal definition
The pin assignments of interface signals are listed as follows:

PIN	Signal	I/O	PIN	Signal	I/O
01	-RESET	I	02	GND	x
03	DD07	I/O	04	DD08	I/O
05	DD06	I/O	06	DD09	I/O
07	DD05	I/O	08	DD10	I/O
09	DD04	I/O	10	DD11	I/O
11	DD03	I/O	12	DD12	I/O
13	DD02	I/O	14	DD13	I/O
15	DD01	I/O	16	DD14	I/O
17	DD00	I/O	18	DD15	I/O
19	GND		(20)	KEY
21	DMARQ	O	22	GND
23	-DIOW	I	24	GND
25	-DIOR	I	26	GND
27	IORDY	O	28	CSEL	I
29	-DMACK	I	30	GND
31	INTRQ	O	32	-HIOCS16	O
33	DA01	I	34	-PDIAG	I/O
35	DA00	I	36	DA02	I
37	-CSO	I	38	-CS1	I
39	-DASP	I/O	40	GND
Notes:
"O" designates an output from the drive. "I" designates an input from the drive. "I/O" designates an input/output common.
Interface
The interface conforms to the working document of information technology - AT attachment - 3 interface (ATA-3) revision 6 dated October 26 1995 with following deviations.
BBK (bad block) Bit 7 error register is supported as a bad block bit. This bit will be set when bad block is reported on read commands.
Check power mode Check power mode command returns FFh to sector count register when the device is in idle mode. This command does not support 80 h as the return value.
Sleep mode During sleep mode the drive will be activated by any command, including, but not limited to, a soft reset.
Hard reset Hard reset response is identical to soft reset response with the following exception: When drive is set as a slave it will activate -DASP line to indicate it is present.

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