Hitachi HTS725050A9A364 Datasheet download pdf (Page 18)

7K500 OEM SPECIFICATION

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4.4

4.44.4

4.4 Performance characteristics

Performance characteristicsPerformance characteristics

Performance characteristics

Drive performance is characterized by the following parameters:

 Command Overhead

 Mechanical Positioning

 Seek Time

 Latency

 Data Transfer Speed

 Buffering Operation (Look ahead/Write Cache)

Note: All the above parameters contribute to drive performance. There are other parameters which

contribute to the performance of the actual system. This specification defines the essential characteristics

of the drive. This specification does not include the system throughput as this is dependent upon the

system and the application.

The following table gives a typical value for each parameter. The detailed descriptions are found in

section 5.0.

Function

Average Random Seek Time – Read/Write (ms) 12

Rotational Speed (RPM) 7200

Power-on-to-ready (sec)(Typical) 4.0

Command overhead (ms) 1.0

Disk-buffer data transfer (Mb/s) (max) 1245

Buffer-host data transfer (Gbit/s) (max) 1.5/3.0

Table 4. Performance characteristics

4.4.1

4.4.14.4.1

4.4.1

Command overhead

Command overheadCommand overhead

Command overhead

Command overhead time is defined as the interval from the time that a drive receives a command to the

time that the actuator starts its motion.

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Hitachi HTS725050A9A364 Datasheet Page 18