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ST3655 Family AT Drives Product Manual, Rev. A
1.1.2 Physical organization
Read/write heads
Servo heads
Discs
1.2 Functional specifications
Interface
Zone Bit Recording method
External data burst transfer rate
(Mbytes per sec)
Internal data transfer rate
(Mbits per sec)
Spindle speed (RPM)
Cache size (Kbytes)
Bytes per sector
Recording density, max (BPI)
Track density (TPI)
* The drives achieve this external transfer rate when using programmed
I/O with IORDY, as shown in Figure 11 on page 32.
** The ST3550A has a recording density of 52,602 bits per inch and a
track density of 2,400 tracks per inch.
1.3 Seek time
Seek time is a true statistical average of at least 5,000 measurements of
seek time. All measurements are under nominal conditions of tempera-
ture and voltage with the drive mounted horizontally. The specifications
in the table below are defined as follows:
• Track-to-track seek time is the average of all possible single-track
seeks in both directions.
• Average seek time is measured by executing seeks in both directions
between random cylinders.
• Full-stroke seek time is half the time needed to seek from track 0 to
the maximum track and back to track 0.
ST3390A
ST3550A
3
5
1
1
2
3
AT
RLL (1,7)
11.1*
21.6 to 36.56
4,500 ± 0.5%
256
512
53,192**
3,000**
ST3655A
5
1
3
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