Section 1
General Description and Specifications
1.2.2
PERFORMANCE SPECIFICATIONS
Capacity
Fonnatted capacity (MB) *
Number
of
512 byte sectors
ProDrive 40S
40
82,029
ProDrive 80S
80
164,058
* One megabyte is defined as 220 bytes
Data
Transfer
Rates Buffer to SCSI Bus - Up to 2.0 Mbytes/second asynchronous,
4.0 Mybtes/seconds synchronous
Disk to Buffer -
Up
to 1.25 Mbytes/second in bursts
Seek Times/Miscellaneous Times
DESCRIPTION
Single Track Seek (msec)
Average
Seek (msec)
1/3
Stroke Seek (msec)
Full
Stroke Seek (msec)
Average Rotational Latency (msec)
Sequential Head Switch (msec)
Power-U~
Time (sec)
TYPICAL
NOMINAL
CONDITION
6
19
:!)
35
8.3
3.0
13
MAXIMUM
NOMINAL
WORST
CASE
CONDITION
CONDITION
7
7
21
23
23
25
40
45
8.3
8.3
3.0 3.0
15
18
NOTES: Quoted seek times include head settling time but do not include command overhead or latency
time.
Seek time is the time required for the actuator to seek and settle on track.
Seek times are measured by averaging 1000 seeks
of
the indicated length. Average seek time is
the average
of
1000 random seeks. In the rare occurrence
of
a seek error, any individual seek
may take up to 5 seconds for recovery.
Sequential head switch time is the time required for the head to move from the end
of
the last
sector on a track to the beginning
of
the next sequential sector, located on the next track, same
cylinder. This time is fixed by the track skewing feature
of
the drive. (See Appendix B.)
Power-up time is the time from the supply voltages reach operating range to the time the drive
is able
to
accept
aU
commands.
Nominal conditions are defined as
25
0
C ambient temperature, nominal supply voltages, and no
applied shock
or
vibration. Worst case conditions are defined as worst case extremes
of
temperature and supply voltages.
General Description and Specifications
1·3
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