Cheetah 9LP Product Manual, Rev. C
9
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 Cheetah 9LP family unless otherwise specified.
Refer to Section 9.10 and to the
SCSI Interface Product Manual
, part number 77738479, 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):
SCSI interface data transfer rate (asynchronous):
Maximum instantaneous one byte wide
5.0 Mbytes/sec [4]
Maximum instantaneous two bytes wide
10.0 Mbytes/sec [4]
Synchronous transfer rate for SCSI Fast-40 (Ultra2 SCSI):
In single-ended (SE) interface mode
5.0 to 40 Mbytes/sec
In low voltage differential (LVD) interface mode
5.0 to 80 Mbytes/sec
ST39102
ST34502
Drive capacity
9.10
4.55
GByte (formatted, rounded off values)
Read/write heads
12
6
Bytes/track
104,840–159,008 104,840–159,008
Bytes (average, rounded off values)
Bytes/surface
939
939
Mbytes (unformatted, rounded off values)
Tracks/surface (total)
6,962
6,962
Tracks (user accessible)
Tracks/inch
8,962
8,962
TPI
Peak bits/inch
183
183
KBPI
Internal data rate
152-231
152-231
Mbits/sec (variable with zone)
Disc rotational speed
10,025
10,025
r/min (+0.5%)
Average rotational latency 2.99
2.99
msec
Including controller overhead
(without disconnect) [1] [3]
Drive level
Read
Write
msec
Average
–
Typical
[2]
5.4
6.2
Single Track
–
Typical
[2]
0.8
1.1
Full Stroke
–
Typical
[2]
<12.2
<13.2
ST39102 and ST34502
Maximum (with verify)
30
Maximum (no verify)
15
Minimum sector interleave
1 to 1
Min.
[3]*
19.0
MByte/sec
Avg.
[3]
23.95
MByte/sec
Max.
[3]
28.9
MByte/sec
Summary of Contents for Cheetah 9LP Series
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