Hitachi 100GB 7200 RPM HTE721010G9SA00 User Manual

Product codes
HTE721010G9SA00
Page of 208
Travelstar E7K100 (Serial ATA) Hard Disk Drive Specification
35 
7.0  Electrical interface specification
7.1  Cabling
The maximum cable length from the host system to the hard disk drive plus circuit pattern length in the host system 
shall not exceed 1 meter.
7.2  Interface connector
The figure below shows the physical pin location.
• 
All pins are in a single row, with a 1.27 mm (.050”) pitch. 
The comments on the mating sequence in Table in the section 7.3 apply to the case of backplane blind-mate 
connector only. In this case, the mating sequences are: (1) the ground pins P4 and P12; (2) the pre-charge power 
pins and the other ground pins; and (3) the signal pins and the rest of the power pins. 
There are three power pins for each voltage. One pin from each voltage is used for pre-charge in the backplane 
blind-mate situation. 
If a device uses 3.3 V, then all V33 pins must be terminated. Otherwise, it is optional to terminate any of the 
V33 pins. 
If a device uses 5.0 V, then all V5 pins must be terminated. Otherwise, it is optional to terminate any of the V5 
pins. 
If a device uses 12.0 V, then all V12 pins must be terminated. Otherwise, it is optional to terminate any of the 
V12 pins.