IBM DARA-206000 Hard Drive Specifications - Page 20

Performance Characteristics

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3.3 Performance Characteristics File performance is characterized by the following parameters: Command Overhead Mechanical Positioning − Seek Time − Latency Data Transfer Speed Buffering Operation Note: All the above parameters contribute to a file performance. There are other parameters which contribute to the performance on the actual system. This specification tries to define the essential file characteristics, not the system throughput which is dependent on the system and the application. The following table gives a typical value of each parameter. The detail descriptions are followed in the next sections. Function Average Random Seek Time For Read Average Random Seek Time For Write Rotational Speed Power On To Ready Command Overhead Disk-Buffer Data Transfer Buffer-Host Data Transfer Figure 5. Performance Parameter Typical 12 msec 14 msec (except DARA-225000) 13 msec (DARA-225000) 4200 rpm (except DARA-225000) 5411 rpm (DARA-225000) 2.8 sec (DARA-212000/209000/206000) 3.0 sec (DARA-218000/215000) 4.5 sec (DARA-225000) 1.0 msec 161.6 - 85.5 Mbit/sec (except DARA-225000) 181.2 - 105.1 Mbits/sec (DARA-225000) 16.6 MB/sec (PIO Mode-4) 66.6 MB/sec (Ultra DMA Mode-4) 10 OEM Specifications of DARA-2xxxxx 2.5 inch H D D Rev 2.1

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3.3
Performance Characteristics
File performance is characterized by the following parameters:
Command Overhead
Mechanical Positioning
−
Seek Time
−
Latency
Data Transfer Speed
Buffering Operation
Note:
All the above parameters contribute to a file performance.
There are other parameters which con-
tribute to the performance on the actual system.
This specification tries to define the essential file character-
istics, not the system throughput which is dependent on the system and the application.
The following table gives a
typical value
of each parameter.
The detail descriptions are followed in the next
sections.
Figure 5. Performance Parameter
Function
Typical
Average Random Seek Time For Read
12 msec
Average Random Seek Time For Write
14 msec
(except DARA-225000)
13 msec
(DARA-225000)
Rotational Speed
4200 rpm
(except DARA-225000)
5411 rpm
(DARA-225000)
Power On To Ready
2.8 sec (DARA-212000/209000/206000)
3.0 sec (DARA-218000/215000)
4.5 sec (DARA-225000)
Command Overhead
1.0 msec
Disk-Buffer Data Transfer
161.6 - 85.5 Mbit/sec
(except DARA-225000)
181.2 - 105.1 Mbits/sec
(DARA-225000)
Buffer-Host Data Transfer
16.6 MB/sec
(PIO Mode-4)
66.6 MB/sec
(Ultra DMA Mode-4)
10
OEM Specifications of DARA-2xxxxx 2.5 inch HDD Rev 2.1