Seagate ST373454FC Cheetah 15K.4 FC Product Manual - Page 23
Performance characteristics
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4.0 Performance characteristics This section provides detailed information concerning performance-related characteristics and features of Cheetah 15K.4 FC drives. 4.1 Internal drive characteristics Drive capacity Read/write data heads Bytes per track Bytes per surface Tracks per surface (total) Tracks per inch Peak bits per inch Internal data rate Disc rotation speed Avg rotational latency ST3146854FC 146.8 8 471,916 18,351 50,864 85,000 628 685-1,142 15k 2.0 ST373454FC 73.4 4 471,916 18,351 50,864 85,000 628 685-1,142 15k 2.0 ST336754FC 36.7 2 471,916 18,351 50,864 85,000 628 685-1,142 15k 2.0 Gbytes (formatted, rounded off value) Bytes (average, rounded off values) Mbytes (unformatted, rounded off value) Tracks (user accessible) TPI KBPI Mbits/sec (variable with zone) rpm msec 4.2 Seek performance characteristics See Section 9.5, "FC-AL physical interface" on page 64 and the Fibre Channel Interface Manual (part number 77767496) for additional timing details. 4.2.1 Access time Average Single track Full stroke Typical Typical Typical Not including controller overhead1,2(msec) Read Write 3.5 4.0 0.2 0.4 7.4 7.9 1. Typical access times are measured under nominal conditions of temperature, voltage, and horizontal orientation as measured on a representative sample of drives. 2. Access to data = access time + latency time. Cheetah 15K.4 FC Product Manual, Rev. C 11