Access Time; Functional; Reliability - Tandy 1000 HX Technical Reference Manual

2.3.3 Access Time
a. Track to Track Slew Rate : 3 msec max.
b. Head Settling Time : 15 msec max.
c. Motor Start Time : 500 msec max.
(700 msec max.*)
Motor start time is defined as the time period necessary to
stabilise the Motor Rotational Speed variance to less than
+/-1.5% after turning the MOTOR ON signal on.
NB. When a disk is inserted in the drive, the Motor Start
Time will be 700 msec at maximum, but, after that it will be
500 msec max. as the disk is kept inserted.
2.3.4 Functional
a. Rotation Speed : 300 rpm
The continuous speed variation is within +/-1.5%.
The instantanuous speed variation is within +/-1.0%.
b. Recording Density : 8717 BPI (Side 1, Track 79) in a 1MB mode
c. Track Density : 135 TPI
d. Cylinders : 80
e. Tracks : 160
f. R/W Heads : 2
2.3.5 Reliability
a. Mean Time Between Failures (MTBF) : 10,000 POH
b. Mean Time to Repair (MTTR) : 30 minutes
c. Preventive Maintenance (PM) : Not Required
d. Components life : 5 years or 15000 POH
e. Error Rate :
1. Soft Read Error : Less than 1 per 10 bits read
2. Hard Read Error : Less than 1 per 1 0
1 2
bits read
3. Seek Error : Less than 1 per 10 seeks
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