Seagate ST300MP0004 Savvio 15K.2 SAS Product Manual - Page 18
Performance characteristics
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5.0 Performance characteristics This section provides detailed information concerning performance-related characteristics and features of Savvio drives. 5.1 Internal drive characteristics Drive capacity Read/write data heads Tracks per surface (total) Tracks per inch Peak bits per inch Areal density Internal data rate Disk rotation speed Avg rotational latency ST9146852SS ST9146752SS ST9146652SS 146.8 4 60,436 180,000 1,317 237.1 1,936 - 1,409 15k 2.0 ST973452SS ST973352SS ST973252SS 73.4 2 60,436 180,000 1,317 237.1 1,936 - 1,409 15k 2.0 Gbytes (formatted, rounded off value) Tracks (user accessible including spare tracks) kTPI (average) kBPI Gbit/in2 Mbits/sec (variable with zone) rpm msec 5.2 Seek performance characteristics See Section 12.4.1, "SAS physical interface" on page 58 and the SAS Interface Manual (part number 100293071) for additional timing details. 5.2.1 Access time Average Single track Full stroke Typical3,4 Typical3,4 Typical3,4 Including controller overhead1, 2 (msec) Read Write 3.1 3.5 0.2 0.42 5.05 5.4 Not including controller overhead1, 2 (msec) Read Write 2.9 3.3 0.2 0.42 4.85 5.2 1. Execution time measured from receipt of the Command to the Response. 2. Assumes no errors and no sector has been relocated. 3. Typical access times are measured under nominal conditions of temperature, voltage, and horizontal orientation as measured on a representative sample of drives. 4. Access time = controller overhead + average seek time and applies to all data transfer commands. Access to data = access time + latency time. 10 Savvio 15K.2 SAS Product Manual, Rev. G