Barracuda 4LP Product Manual, Rev. D
9
4.0
Performance characteristics
4.1
Internal drive characteristics (transparent to user)
4.2
SCSI Seek performance characteristics (visible to user) [6]*
The values given in Section 4.2.1 apply to all models of the Barracuda 4LP family unless otherwise specified.
Refer to Section 9.10 and to the SCSI-2 Interface Product Manual 77738479 for additional timing details.
4.2.1
Access time [8]
*[ ] All notes for Section 4.2 are listed at end of Section 4.2.3.
ST34371
ST32171
ST34571
ST32271
Drive Capacity
5.31
2.65
5.54
2.77
GByte (UNF, rounded off values)
Read/Write Heads
10
5
10
5
Bytes/Track
102,500
102,500
106,980
106,980
Bytes (Avg, rounded off values)
Bytes/Surface
531
531
554
554
Mbytes (UNF, rounded off values)
Tracks/Surface, Total
5,178
5,178
5,178
5,178
Tracks (user accessible)
Tracks/Inch
5,555
5,555
5,555
5,555
TPI
Peak Bits/Inch
123,000
123,000
128,000
128,000
BPI
Internal Data Rate
80-122
80-122
83-126
83-126
Mbits/sec (variable with zone)
Disc Rotational Speed
7,200
7,200
7,200
7,200
r/min
Average Rotational Latency
4.17
4.17
4.17
4.17
ms
Including Controller Overhead
(without disconnect) [1] [4]
Drive Level
Read
Write
ms
Average
–
Typical
[3]
9.4
10.4
Max.
[2]
10.8
11.3
Single Track
–
Typical
[3]
2.0
2.1
Max.
[2]
2.2
2.3
Full Stroke
–
Typical
[3]
17.5
18.5
Max.
[2]
20.0
20.5
