Seagate ST3500071FC Performance characteristics, Internal drive characteristics, Access time

4.0Performance characteristics

This section provides detailed information concerning performance-related characteristics and features of NL35 Series drives.

4.1Internal drive characteristics

	ST3500071FC	ST3400071FC
Drive capacity*	500.0	400.0	Gbytes (formatted, rounded off value)
Read/write data heads	8	8
Bytes per track	686	552	Kbytes (average, rounded off values)
Bytes per surface	84.1	67.7	Mbytes (unformatted, rounded off value)
Tracks per surface (total)	122,712	122,712	Tracks (user accessible)
Tracks per inch	120,000	120,000	TPI
Peak bits per inch	747	597	KBPI
Internal data rate	411-794	322-669	Mbits/sec (variable with zone)
Disc rotation speed	7,200	7,200	rpm (+ 0.5%)
Avg rotational latency	4.17	4.17	msec

*One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on op- erating environment and formatting.

4.2Seek performance characteristics

4.2.1Access time [4]

Not including controller overhead (without disconnect) [1]

	Drive level
	Read	Write
	msec
Average—Typical [2]	8.5	9.5
Single Track—Typical [2]	0.8	1.0
Full Stroke—Typical [2]	16	16.5

4.2.2Format command execution time (in minutes)

	ST3500071FC	ST3400071FC
Maximum (with verify)	375	360
Maximum (without verify)	170	155

NL35 Series FC Product Manual, Rev. D 11