Hitachi 7K320 Specifications - Page 18

Performance characteristics

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7K320 SATA OEM Specification 4.4 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) Rotational Speed (RPM) Power-on-to-ready (sec)(Typical) Command overhead (ms) Disk-buffer data transfer (Mb/s) (max) Buffer-host data transfer (Gbit/s) (max) Table 4. Performance characteristics 12 7200 4.0 1.0 1136 1.5/3.0 4.4.1 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. Page 18 of 176

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7K320 SATA OEM Specification
Page 18 of 176
4.4
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)
1136
Buffer-host data transfer (Gbit/s) (max)
1.5/3.0
Table 4. Performance characteristics
4.4.1
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.