Service Manuals, User Guides, Schematic Diagrams or docs for : HP disc 5957-6584_9123D_3.5_Flex_Disc_Nov85
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Flidl HEWLETT MANUAL UPDA TE
~~ PACKARD
5957-6,584
UPDATE FOR THE 3 1/2-INCH FLEXIBLE DISC DRIVE SERVICE
MANUAL (PART NUMBER 09121-90030)
This update is for the tabbed section of the manual labeled 91230. The update covers information on the
HP 91230 product.
To update your manual, remove the old tab and text from the manual and replace it with this update.
The updated section contains a revision date below the page numbers.
ICHAPTERI
GENERAL INFORMATION 1
Introduction
The HP 9123D Disc Drive (Figure 1-1) is a random-access data storage device containing two 3 1/2-inch
double-sided disc drives with a storage Gapacity of 710 Kbytes per drive. The DC power for the unit is sup-
plied by the host system. The unit was designed for use with the Touchscreen II only, and uses the SUBSET
80 command set.
Figure 1-1. HP 91230 Disc Drive.
Part Number 5957-6584
1-1
11/01/85
GENERAL INFORMATION
Specifications
Physical Characteristic's
Number of drives 2
Net Weight
Height 76mm(2.99 in.)
Depth 285mm ( 11 . 1 in.)
Width 325mm ( 12 . 8 in.)
Interface HP-IB
Performance Characteristics
HP Double-Density Format
Encodtng MFM
RotaU.onal speed 600 RPM
Bit density @ 6aO RPM Track 79 (inside track) 8717 BPI
Track density 135 tracks per inch
Tracks per surface 80
Surfaces used per disc 2
Capacity
Bytes/sector 512
Sectors/track 9
Tracks 80
Bytes/drive (Formatted) 709.632 Kbytes (154 tracks used for data)
Access Time
Track-to-track seek 15 ms/track, plus 28 ms settling
Maximum track-to-track
seek (80 tracks) 1213 ms
Average track-to-track 433 ms
Maximum rotational latency 100 ms
Average rotational latency 50 ms
Spindle motor ON time 400 ms
Maximum data access time
(seek plus latency
plus motor ON time) 1.713 s
Average data access time 483 ms
1-2
11/01/8.s
GENERAL INFORMATION
NOTE
All of HP's computers spare 4 complete tracks. This
reduces the usable user space to 512*9* 154 (bytes/sec-
tor times sector/track times unspared tracks). This total
equals 709.632 Kbytes. The remaining two tracks are
f or system use.
Power Requirements
Serial number prefix Serial number prefix
252SA and below 2536A and above
Voltage +12 VDC +12 VDC
(must be supplied by + 5 VDC + 5 VDC
host computer)
Current Requirements +12 VDC 3.0 A max. (250ms) +12 VDC (.6 A max)
.6 A average
+ 5 VDC 2.2 A max. + 5 VDC (.S A max)
Environmental Specifications
Operating Limits
Temperature
Humidity 20 to SO% with maximum wet bulb
temperature (non-condensing) not
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