Seagate ST336754SS Cheetah 15K.4 SAS Product Manual - Page 21
Performance characteristics
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4.0 Performance characteristics This section provides detailed information concerning performance-related characteristics and features of Cheetah 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 ST3146854SS 146.8 8 471,916 18,351 50,864 85,000 628 685-1,142 15k 2.0 ST373454SS 73.4 4 471,916 18,351 50,864 85,000 628 685-1,142 15k 2.0 ST336754SS 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 9.4.1, "SAS physical interface" on page 57 and the SAS Interface Manual (part number 100293071) for additional timing details. 4.2.1 Access time Not Including controller overhead1, 2 (msec) Read Write Average Typical 3.5 4.0 Single track Typical 0.2 0.4 Full stroke Typical 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 SAS Product Manual, Rev. B 11