Seagate ST500NM0001 Constellation ES 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 ES 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 ST32000444SS ST32000445SS ST32000446SS 2000 8 1,012,608 250,000 248,600 237,000 1,515,000 347 95 - 212 7200 4.16 ST31000424SS ST31000425SS ST31000426SS 1000 4 1,012,608 250,000 248,600 237,000 1,515,000 347 95 - 212 7200 4.16 ST3500414SS ST3500415SS ST3500416SS 500 GB (formatted, rounded off value) 2 1,012,608 Bytes (average, rounded off values) 250,000 MB (unformatted, rounded off value) 248,600 Tracks (user accessible) 237,000 TPI (average) 1,515,000 347 BPI Gb/in2 95 - 212 MB/s (variable with zone) 7200 rpm 4.16 ms 5.2 Seek performance characteristics See Section 12.4.1, "SAS physical interface" on page 64 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 Not including controller overhead1, 2 (ms) Read Write 8.3 9.3 0.5 0.8 18 19 Including controller overhead1, 2 (ms) Read Write 8.5 9.5 0.7 1.0 18.2 19.2 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 Constellation ES Series SAS Product Manual, Rev. F