Seagate ST9450404FC Performance characteristics, Internal drive characteristics, Seek performance

4.0Performance characteristics

This section provides detailed information concerning performance-related characteristics and features of Sav- vio 10K.4 FC drives.

4.1Internal drive characteristics

	ST9600204FC	ST9450404FC
Drive capacity*	600	450	GBs (formatted, rounded off value)
Read/write data heads	6	6
Tracks per inch	240,000	180,000	TPI
Peak bits per inch	1,430	1,430	kBPI
Areal density	343	257.4	Gb/in2
Internal data rate	1.62	1.62	Gb/s (variable with zone)
disk rotation speed	10K	10K	rpm
Avg rotational latency	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.

4.2Seek performance

See Section 9.5, "FC-AL physical interface" on page 58 and the Fibre Channel Interface Manual (part number 77767496) for additional timing details.

4.2.1Access time

Not including controller overhead1,2(ms)

		Read	Write
Average		3.80	4.40
Single track	600GB	0.30	0.55
	Typical
Full stroke		3.88	4.56
Average		4.00	4.65
Single track	450GB	0.32	0.58
	Typical
Full stroke		4.10	4.61

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.

Savvio 10K.4 FC Product Manual, Rev. A 9