Seagate Laptop Thin SSHD SATA Product Manual, Rev. E
8
Drive Specifications
2.2
Physical organization
2.3
Recording and Interface Technology
2.4
Physical Characteristics
2.5
Seek time
Seek measurements are taken with nominal power at 25°C ambient temperature. All times are measured using drive diagnostics. The specifications
in the table below are defined as follows:
Track-to-track seek time is an average of all possible single-track seeks in both directions.
Average seek time is a true statistical random average of at least 5000 measurements of seeks between random tracks, less overhead.
Drive model
Read/write heads
Number of discs
ST500UM001
2
1
ST320UM001
Interface
Serial ATA (SATA)
Recording method
Perpendicular
Recording density
1894 Kb/in
Track density
375 ktracks/in avg
Areal density
705 Gb/in
2
avg
Spindle speed
5400 RPM +/- 0.2%
Sustained data transfer rate
100 MB/s max
I/O data-transfer rate
600 MB/s max
All models
Height
6.8 +/- 0.2 mm (0.370 +/-.008 in)
Width
69.85 +/- 0.25 mm (2.750 +/- 0.010 in)
Length
100.35 +0.20 / -0.25 mm (3.951 +0.008 / -0.010 in)
Typical weight
95 g (0.209 lb)
Cache buffer
64 MB (64,768 KB)
Table 2
Typical seek times
Typical seek times (ms)
Read
Track-to-track
2.0
Average
12.0
Average latency
5.6
N
OTE
These drives are designed to consistently meet the seek times represented in this manual.
Physical seeks, regardless of mode (such as track-to-track and average), are expected to meet the
noted values. However, due to the manner in which these drives are formatted, benchmark tests
that include command overhead or measure logical seeks may produce results that vary from
these specifications.
