Seagate ST4000NM0033 Constellation ES.1 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.1 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 Disk rotation speed Avg rotational latency ST2000NM0001 ST1000NM0001 ST500NM0001 ST2000NM0021 ST1000NM0021 ST500NM0021 ST2000NM0041 ST1000NM0041 ST500NM0041 2TB 1TB 500GB (formatted, rounded off value) 8 4 2 1,012,608 1,012,608 1,012,608 Bytes (average, rounded off values) 250,000 250,000 250,000 MB (unformatted, rounded off value) 248,600 248,600 248,600 Tracks (user accessible) 237,000 237,000 237,000 TPI (average) 1,523,000 324 1,523,000 324 1,523,000 324 BPI Gb/in2 95 - 212 95 - 212 95 - 212 MB/s (variable with zone) 7200 7200 7200 rpm 4.16 4.16 4.16 ms 5.2 Seek performance characteristics See Section 12.4.1, "SAS physical interface" on page 66 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.1 SAS Product Manual, Rev. E