Seagate 810 Typical current profile, Typical watts RMS Typical amps RMS Mode At nominal voltage

8 Marathon 810 (ST9816AG) Product Manual, August 1995

level. Active mode current and power are measured with a 32-msec delay between each operation and the drive in default logical geometry. Seeking power and currents are measured during one-third-stroke buff- ered seeks. Read/Write power and current are measured with the heads on track, based on a 16-sector write followed by a 32-msec delay, then a 16-sector read followed by a 32-msec delay. Spinup power is measured from time of power-on to time of drive-ready for normal operation.

	Typical watts RMS	Typical amps RMS
Mode	(at nominal voltage)	(at nominal voltage)
Spinup	3.50	0.700
Active
Seeking	2.10	0.420
Read/Write	2.10	0.420
Idle	1.30	0.260
Standby	0.40	0.080
Sleep	0.30	0.060

1.7.1.1Typical current profile

Figure 1 shows a typical current profile for the ST9816AG.

Current (Amps)

1.6	Spinup
1.4			Drive ready
1.2
1.0
0.8			Upload code					Idle			Standby		Sleep
						Active
						mode		mode				mode	mode
0.6
0.4
0.2
0.0
0	1	2	3	4	5	5	6	7	8	9	10	11	12	13

Time (seconds)

Figure 1. Typical startup and operation current profile for the ST9816AG