Seagate ST373454 Manual download pdf (Page 18)

8 Cheetah 15K.3 SCSI Product Manual, Rev. G

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 15K.3 SCSI family unless otherwise spec-

ified. Refer to Section 9.10 and to the

SCSI Interface Product Manual

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

In low voltage differential (LVD) interface mode 5.0 to 320 Mbytes/sec

ST373453 ST336753 ST318453

Drive capacity 73.4 36.7 18.4 GByte (formatted, rounded off values)

Read/write heads 8 4 2

Bytes/track 377,770 377,770 377,770 Bytes (average, rounded off values)

Bytes/surface 12,046 12,046 12,046 Mbytes (unformatted, rounded off values)

Tracks/surface (total) 31,310 31,310 31,310 Tracks (user accessible)

Tracks/inch 64,000 64,000 64,000 TPI

Peak bits/inch 533 533 533 KBPI

Internal data rate 632-891 632-891 632-891 Mbits/sec (variable with zone)

Disc rotational speed 15k 15k 15k r/min

Average rotational latency 2.0 2.0 2.0 msec

Including controller overhead

(without disconnect) [1] [3]

Not including controller overhead

(without disconnect) [1] [3]

Drive level Drive level

Read Write Read Write

msec msec

Average–Typical [2] 3.8 4.1 3.6 3.9

Single Track–Typical [2] 0.40 0.60 0.20 0.40

Full Stroke–Typical [2] 6.7 7.1 6.5 6.9

ST373453 ST336753 ST318453

Maximum (with verify) 90 60 30

Maximum (no verify) 45 30 15

Minimum sector interleave 1 to 1

Minimum [3]* 56.1 MBytes/sec

Maximum [3] 86.0 MBytes/sec

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