Seagate ST9900805FC Performance characteristics, Internal drive characteristics, Seek performance

5.0Performance characteristics

This section provides detailed information concerning performance-related characteristics and features of Sav- vio 10K.5 FC drives.

5.1Internal drive characteristics

	ST9900805FC	ST9600205FC	ST9450405FC	ST9300605FC
Drive capacity*	900	600	450	300	GBs (formatted, rounded off value)
Read/write data heads	6	4	3	2
Tracks per inch	300,000	300,000	300,000	300,000	TPI
Peak bits per inch	1686	1686	1686	1686	kBPI
Areal density	506	506	506	506	Gb/in2
Internal data rate	1.00 to 1.91	1.00 to 1.91	1.00 to 1.91	1.00 to 1.91 Gb/s (ID to OD)
disk rotation speed	10K	10K	10K	10K	rpm
Avg rotational latency	3.0	3.0	3.0	3.0	ms

*One GB equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment and formatting.

5.2Seek performance

See Section 10.5, "FC-AL physical interface" on page 68 and the Fibre Channel Interface Manual (part number 77767496) for additional timing details.

5.2.1Access time

Not including controller overhead1,2(ms)

	900GB models		600, 450 and 300GB models
	Read	Write	Read	Write
Average	3.7	4.1	3.4	3.8
Single track	0.2	0.4	0.2	0.4
Full stroke	7.7	8.1	7.1	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.

10 Savvio 10K.5 FC Product Manual, Rev. D