Seagate ST936751FC manual Performance characteristics, Internal drive characteristics, Access time

4.0Performance characteristics

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

4.1Internal drive characteristics

	ST973451FC	ST936751FC
Drive capacity	73.4	36.2	Gbytes (formatted, rounded off value)
Read/write data heads	4	2
Tracks per surface (total)	42,554	42,554	Tracks (user accessible)
Tracks per inch	150	150	kTPI (average)
Peak bits per inch	861.81	861.81	kBPI
Areal Density	130.58	130.58	Gbit/in2
Internal data rate	957.51 to 1,282.08	957.51 to 1,282.08	Mbits/sec (variable with zone)
Sustained data transer rate	57-89	57-89	Mbytes/sec (variable with zone)
Disc rotation speed	15k	15k	revolutions/min (RPM)
Avg rotational latency	2.0	2.0	msec

4.2Seek performance characteristics

See Section 9.5, "FC-AL physical interface" on page 57 and the Fibre Channel Interface Manual (part number 100293070) for additional timing details.

4.2.1Access time

Not Including controller overhead1, 2 (msec)

		Read	Write
Average	Typical3,4	2.6	3.1
Single track	Typical3,4	0.2	0.4
Full stroke	Typical3,4	4.9	5.5

1.Execution time measured from receipt of the FCP Command to the FCP Response.

2.Assumes no errors and no sector has been relocated.

3.Typical access times are measured under nominal conditions of temperature, volt- age, and horizontal orientation as measured on a representative sample of drives.

4.Access to data = access time + latency time.

Savvio 15K.1 FC Product Manual, Rev. B 11