Seagate ST39204LC Product Manual - Page 19
Performance characteristics
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Cheetah 18XL Product Manual, Rev. G 9 4.0 Performance characteristics 4.1 Internal drive characteristics (transparent to user) Drive capacity Read/write heads Bytes/track Bytes/surface Tracks/surface (total) Tracks/inch Peak bits/inch Internal data rate Disc rotational speed Average rotational latency ST318404 18.352 6 203,008 3,058 14,384 18,145 339 285-424 10,033 2.99 ST39204 9.176 3 203,008 3,058 14,384 18,145 339 285-424 10,033 2.99 GByte (formatted, rounded off values) Bytes (average, rounded off values) Mbytes (unformatted, rounded off values) Tracks (user accessible) TPI KBPI Mbits/sec (variable with zone) r/min (+0.5%) msec 4.2 SCSI performance characteristics (visible to user) The values given in Section 4.2.1 apply to all models of the Cheetah 18XL family unless otherwise specified. 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] Average - Typical [2] Single Track - Typical [2] Full Stroke - Typical [2] Including controller overhead (without disconnect) [1] [3] Drive level Read 5.4 0.8 10.2 Write msec 6.0 1.1 11.2 Not including controller overhead (without disconnect) [1] [3] Drive level Read 5.2 0.6 10.0 Write msec 5.8 0.9 11.0 4.2.2 Format command execution time (minutes) [1] Maximum (with verify) Maximum (no verify) ST318404 25 12 ST39204 13 6 4.2.3 Generalized performance characteristics Minimum sector interleave 1 to 1 Data buffer transfer rate to/from disc media (one 512-byte sector): Min. [3]* Avg. [3] Max. [3] 26 MByte/sec 33 MByte/sec 40 MByte/sec SCSI interface data transfer rate (asynchronous): Maximum instantaneous one byte wide Maximum instantaneous two bytes wide Synchronous formatted transfer rate In single-ended (SE) interface mode In low voltage differential (LVD) interface mode 5.0 Mbytes/sec [4] 10.0 Mbytes/sec [4] Ultra2 SCSI 5.0 to 40 Mbytes/sec 5.0 to 80 Mbytes/sec Ultra160 SCSI 5.0 to 80 Mbytes/sec 5.0 to 160 Mbytes/sec