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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
(msec)
Typical write
(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.
1.7.1 Power 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
Marathon 810 (ST9816AG) Product Manual, August 1995 7