Seagate ST9500621SS Constellation 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 Constellation drives. 5.1 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 Areal density Internal data rate Disc rotation speed Avg rotational latency ST9500430SS, ST9500431SS & ST9500432SS 500 Gbytes (formatted, rounded off value) 6 890,823 Bytes (average, rounded off values) 83,370 Mbytes (unformatted, rounded off value) 123,148 Tracks (user accessible) 200,000 TPI (average) 1,410,000 283 BPI Gbit/in2 75 - 142 Mbytes/sec (variable with zone) 7,200 rpm 4.16 msec 5.2 Seek performance characteristics See Section 12.4.1, "SAS physical interface" on page 55 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 8.2 8.6 0.5 0.7 17.55 18.02 Not including controller overhead1, 2 (msec) Read Write 8.0 8.4 0.5 0.7 17.35 17.82 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 Constellation SAS Product Manual, Rev. F