Seagate ST3300656SS Cheetah 15K.6 SAS Product Manual - Page 15
Performance characteristics
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4.0 Performance characteristics This section provides detailed information concerning performance-related characteristics and features of Cheetah 15K.6 drives. 4.1 Internal drive characteristics Drive capacity ST3450856SS ST3300656SS ST3146356SS ST3450056SS ST3300056SS ST3146756SS 450 300 146 Gbytes (formatted, rounded off value)* Read/write data heads 8 6 3 Tracks per inch 150,000 150,000 150,000 TPI Peak bits per inch Areal Density 1,100 165 1,100 165 1,100 165 KBPI Gbits/inch2 Internal data rate 1.95 1.95 1.95 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. 4.2 Seek time See Section 9.4.1, "SAS physical interface" on page 62 and the SAS Interface Manual (part number 100293071) for additional timing details. 4.2.1 Access time Not Including controller overhead1, 2 (msec) Read Write Average Typical 3.4 3.9 Single track Typical 0.20 0.44 Full stroke Typical 6.43 7.12 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.6 SAS Product Manual, Rev. B 11