Specifications; Performance Characteristics - Western Digital Blue WD20SPZX Technical Reference Manual

2.0 S
PECIFICATIONS
2.1

Performance Characteristics

Average Seek
- Read
- Write
Track-to-Track Seek
Rotational Speed
Data Transfer Rates
- Interface Speed
- Internal Transfer Rate
Buffer Size
Error Rate - Unrecoverable
Spindle Start Time
- From Power-on to Drive Ready
- From Power-on to Rotational Speed
Spindle Stop Time
Load/Unload Cycles
1
During continuous Seek, Read, or Write commands, an algorithm in the code will add latency as
required to keep the VCM motor from overheating. Seek performance will be impacted under this
condition.
2
As used for storage capacity, one megabyte (MB) = one million bytes, one gigabyte (GB) = one billion
bytes, and one terabyte (TB) = one trillion bytes. Total accessible capacity varies depending on
operating environment. As used for buffer or cache, one megabyte (MB) = 1,048,576 bytes. As used for
transfer rate or interface, megabyte per second (MB/s) = one million bytes per second, and gigabit per
second (Gb/s) = one billion bits per second. Effective maximum SATA 6 Gb/s transfer rate calculated
according to the Serial ATA specification published by the SATA-IO organization as of the date of this
document. Visit www.sata-io.org for details.
3
Defined as the time from power-on to the setting of Drive Ready and Seek Complete including
calibration. Dependent on the condition of the drive.
4
Defined as the time from power-on to when the full spindle rotational speed is reached.
5
Controlled unload at ambient condition.

Specifications

1
1
2
3
4
5
WESTERN DIGITAL CONFIDENTIAL
13.0 ms average
15.0 ms average
1.2 ms average
5400 RPM
6 Gb/s
149MB/s (Max).
128MB
14
<1 in 10 bits read
3.5s average
2.0s average/4.0s max
8s average
600,000
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