Seagate ST3300655LC Cheetah 15K.7 SAS Product Manual - Page 15
Performance characteristics - hard drive
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5.0 Performance characteristics This section provides detailed information concerning performance-related characteristics and features of Cheetah 15K.7 drives. 5.1 Internal drive characteristics Drive capacity ST3600057SS ST3600957SS ST3600857SS 600 ST3450857SS ST3300657SS ST3450757SS ST3300557SS ST3450657SS ST3300457SS 450 300 Gbytes (formatted, rounded off value)* Read/write data heads 8 6 4 Tracks per inch 165,000 165,000 165,000 TPI Peak bits per inch Areal Density 1,361 225 1,361 225 1,361 225 KBPI Gbits/inch2 Internal data rate 1.49 - 2.37 1.49 - 2.37 1.49 - 2.37 Gbits/sec (max) Disk rotation speed 15k 15k 15k RPM Avg rotational latency 2.0 2.0 2.0 msec *One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment and formatting. 5.2 Seek time 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 Not Including controller overhead1, 2 (msec) Read Write Average Typical 3.4 3.9 Single track Typical 0.2 0.44 Full stroke Typical 6.6 7.4 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.7 SAS Product Manual, Rev. C 9