Hitachi 100GB 7200 RPM HTE721010G9SA00 Benutzerhandbuch
Produktcode
HTE721010G9SA00
Travelstar E7K100 (Serial ATA) Hard Disk Drive Specification
14
4.4 Performance characteristics
Drive performance is characterized by the following parameters:
• Command overhead
• Mechanical head positioning
• Mechanical head positioning
- Seek time
- Latency
- Latency
• Data transfer speed
• Buffering operation (Look ahead/Write cache)
• Buffering operation (Look ahead/Write cache)
All the above parameters contribute to drive performance. There are other parameters that contribute to the perfor-
mance of the actual system. This specification tries to define the bare drive characteristics, not system throughput,
which depends on the system and the application.
mance of the actual system. This specification tries to define the bare drive characteristics, not system throughput,
which depends on the system and the application.
Table 4: Performance characteristics
4.4.1 Command overhead
Command overhead is defined as the interval from the time that a drive receives a command to the time that the
actuator starts it’s motion.
actuator starts it’s motion.
4.4.2 Mechanical positioning
4.4.2.1 Average seek time (including settling)
Function
Average Random Seek Time - Read (ms)
10
Average Random Seek Time - Write (ms)
11
Rotational Speed (RPM)
7200
Power-on-to-ready (sec)
4.0 sec
Command overhead (ms)
1.0
Disk-buffer data transfer (Mb/s)
267-629 max
Buffer-host data transfer (Gbps)
1.5
Table 5: Mechanical positioning performance
Command type
Typical (ms)
Max (ms)
Random track @ read
Random track @ write
10
16
11
17