Marathon 2250 and Marathon 1680 Product Manual
1.4 Physical characteristics
Maximum height
(inches)
(mm)
Maximum width
(inches)
(mm)
Maximum length
(inches)
(mm)
Typical weight
(ounces)
(grams)
Note. Maximum length excludes I/O connector pins that may extend up
to 0.015 inches beyond the edge of the head/disc assembly, per
SFF 8004 specification.
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 40°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
Track-to-track
Average
Full-stroke
Average latency: 6.65 msec
Marathon 2250
Marathon 1680
0.676
0.676
(17.2)
(17.2)
2.76
2.76
(70.1)
(70.1)
3.955
3.955
(100.45)
(100.45)
7.19
7.05
(204)
(200)
Typical read
Typical write
(msec)
(msec)
4
5
12
14
26
28
7