Seagate ST318438LW ユーザーズマニュアル
8
Barracuda 36ES2 Product Manual, Rev. B
4.0
Performance characteristics
4.1
Internal drive characteristics (transparent to user)
4.2
SCSI performance characteristics (visible to user)
The values given in Section 4.2.1 apply to all models of the Barracuda 36ES2 family unless otherwise speci-
fied. Refer to Section 9.10 and to the
fied. Refer to Section 9.10 and to the
SCSI Interface Product Manual, part number 75789509, for additional
timing details.
4.2.1
Access time [5]
4.2.2
Format command execution time (minutes) [1]
4.2.3
Generalized performance characteristics
Data buffer transfer rate to/from disc media (one 512-byte sector):
ST336938/
ST336918
ST336918
ST318438/
ST318418
ST318418
Drive capacity
36.954
19.924
Gbytes (formatted, rounded off)
Read/write heads
2
2
Bytes/track
401
401
KBytes (average, rounded off)
Bytes/surface
18.477
18.477
Mbytes (unformatted, rounded off)
Tracks/surface (total)
56,332
26,000
Tracks (user accessible)
Tracks/inch
58,480
58,480
TPI
Peak bits/inch
480
480
KBPI
Internal data rate
298-500
434-500
Mbits/sec (variable with zone)
Disc rotational speed
7,200
7,200
r/min (+0.5%)
Average rotational latency
4.17
4.17
msec
Including controller overhead
(without disconnect) [1] [3]
(without disconnect) [1] [3]
Not including controller overhead
(without disconnect) [1] [3]
(without disconnect) [1] [3]
Drive level
Drive level
Read
Write
Read
Write
36 Gbyte Model
msec
msec
Average–Typical [2]
8.7
9.5
8.5
9.3
Single Track–Typical [2]
0.8
1.2
0.6
1.0
Full Stroke–Typical [2]
15.1
15.8
14.9
15.6
18 Gbyte Model
Average–Typical [2]
Average–Typical [2]
7.1
7.7
6.9
7.5
Single Track–Typical [2]
0.8
1.2
0.6
1.0
Full Stroke–Typical [2]
10.2
10.9
10.0
10.7
ST336938, ST336918
ST318438, ST318418
ST318438, ST318418
Maximum (with verify)
46
Maximum (no verify)
23
Minimum sector interleave
1 to 1
Minimum [3]*
32.3 Mbytes/sec
Average [3]
45.9 Mbytes/sec
Maximum [3]
52.2 Mbytes/sec