Seagate ST9320312AS ユーザーズマニュアル
Momentus Product Manual, Rev. D
9
3.5
Recording and interface technology
Interface
Serial ATA (SATA)
Recording method
Perpendicular
Recording density BPI (bits/in avg)
1560k
Track density TPI (tracks/in avg)
325k
Areal density (Gb/in
2
avg)
507
Spindle speed (RPM) (
± 0.2%)
5400
Maximum Internal transfer rate (Mb/s)
1175
I/O data-transfer rate (MB/s max)
300
Interleave
1:1
Cache buffer
8MB (8192KB)
3.6
Physical characteristics
Drive specification
Height
(mm)
(in)
9.5 +/-0.2
0.374 +/-0.008
Width
(mm)
(in)
69.85 +/-0.25
2.75 +/-0.010
Length
(mm)
(in)
100.35 +0.20 / -0.25
3.951 +0.008 / -0.010
Weight (max)
<100 g
0.220 lb
3.7
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:
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.
Table 3:
Typical seek times
Seek times (ms)
Read
Track-to-track (typical)
1.5
Average (typical)
13.0
Full-stroke (max)
27.0
Average latency
5.2
Note.
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.
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.