Seek time, Startup times, Power specifications

Marathon 810 (ST9816AG) Product Manual, August 1995	7

1.5 Seek time

All seek times are measured using a 25 MHz 486 AT computer (or faster) with a 8.3 MHz I/O bus. The measurements are taken with nominal power at sea level and 25°C ambient temperature. The specifications in the table below are defined as follows:

∙Track-to-track seek time is an average of all possible single-track seeks in both directions.

∙Average seek time is a true statistical random average of at least 5,000 measurements of seeks between random tracks, less overhead.

∙Full-stroke seek time is one-half the time needed to seek from the first data cylinder to the maximum data cylinder and back to the first data cylinder. The full-stroke typical value is determined by averaging 100 full-stroke seeks in both directions.

Seek type	Typical read	Typical write
	(msec)	(msec)
Track-to-track	6	7
Average	16	20
Full-stroke	26	28
Average latency: 6.67 msec

1.6 Startup times

Power-on to Ready (sec)	7 (typical)
Standby to Ready (sec)	3 (typical), 10 (max.)

Note. The drive responds to nonmedia commands within 2 seconds (max) of power-up, and responds to media commands within 12 seconds (max) of power-up.

1.7 Power specifications

The drive receives DC power (+5V) through pin 41 and pin 42 of the ATA interface connector.

1.7.1Power consumption

Power requirements for the drive are listed in the table below. Typical power measurements are based on an average of drives tested under nominal conditions, using 5.0V input voltage at 25°C ambient temperature at sea