Seagate ST318418N Product Manual - Page 18
Performance characteristics
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8 Barracuda 36ES2 Product Manual, Rev. B 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 ST336938/ ST336918 36.954 2 401 18.477 56,332 58,480 480 298-500 7,200 4.17 ST318438/ ST318418 19.924 Gbytes (formatted, rounded off) 2 401 KBytes (average, rounded off) 18.477 Mbytes (unformatted, rounded off) 26,000 Tracks (user accessible) 58,480 TPI 480 KBPI 434-500 Mbits/sec (variable with zone) 7,200 r/min (+0.5%) 4.17 msec 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 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] Including controller overhead (without disconnect) [1] [3] 36 Gbyte Model Average-Typical [2] Single Track-Typical [2] Full Stroke-Typical [2] Drive level Read Write msec 8.7 9.5 0.8 1.2 15.1 15.8 Not including controller overhead (without disconnect) [1] [3] Drive level Read 8.5 0.6 14.9 Write msec 9.3 1.0 15.6 18 Gbyte Model Average-Typical [2] 7.1 7.7 Single Track-Typical [2] 0.8 1.2 Full Stroke-Typical [2] 10.2 10.9 6.9 7.5 0.6 1.0 10.0 10.7 4.2.2 Format command execution time (minutes) [1] Maximum (with verify) Maximum (no verify) ST336938, ST336918 ST318438, ST318418 46 23 4.2.3 Generalized performance characteristics Minimum sector interleave 1 to 1 Data buffer transfer rate to/from disc media (one 512-byte sector): Minimum [3]* 32.3 Mbytes/sec Average [3] 45.9 Mbytes/sec Maximum [3] 52.2 Mbytes/sec
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