Seagate ST320LT011 - 9ZVG42 ユーザーズマニュアル
Momentus Thin Product Manual, Rev. C Gen-2
7
3.5
Recording and interface technology
4K sector models
Interface
Serial ATA (SATA)
Recording method
Perpendicular
Recording density BPI (bits/in avg)
1397k
Track density TPI (tracks/in avg)
315k
Areal density (Gb/in
2
avg)
425
Spindle speed (RPM) (
± 0.2%)
7200
Maximum Internal transfer rate (Mb/s)
1247
I/O data-transfer rate (Gb/s max)
3.0
Interleave
1:1
Cache buffer
16 MB (16,384 KB)
3.6
Physical characteristics
Drive specification
Height
(mm)
(in)
6.8 +/-0.2
0.268 +/-0.0079
Width
(mm)
(in)
69.85 +/-0.25
2.75 +/-0.0098
Length
(mm)
(in)
100.35 +0.20/-0.25
3.951 +0.008/-0.010
Weight (max)
All models
92.0 g
0.203 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 2:
Typical seek times
Typical seek times (ms)
Read
Track-to-track
1.5
Average
11
Average latency
4.17
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.