Genera) Information; Introduction; Technical Specifications - HP 9122D Service Manual

iCHAPTER
I
GENERAL INFORMA TION
I
1
I
Introduction
The HP 9122 disc drives are random access data storage devices. The HP 9122S contains a single 3
1/2-inch -double-sided drive and the HP 9122D contains two 3 I/2-inch double sided disc drives. The
storage capacity ranges from 630K bytes to 7 8SK bytes depending on the sector size beng used.
The HP 9122 dics drives have beeR designed using the SUBSET 80 command set. Refer to the Subset 80
Reference
Manua~,
PN 595.8-4129, for a complete description of this command set.
Technical Specifications
Number of drives
Net Weight
Height
Depth
Width
Interface
HP
Double-Density Format
Encoding
Rotational Speed
Bit Density @ 600 RPM
Track Density
Tracks per Surface
Surfaces used per disc
HP 9122S HP 9122D
1 2
3.6kg (8.5 lbs)
76 mm (2.99 in.)
285 mm (1
1 .
2 in.)
325 mm (12.8 in.)
4.5 kg (10 lbs)
76 mm (2.99
285 mm ( 11 .2
325 mm (12.8
HP-IB
MFM
600 RPM
Track 79 (Inside track) 8717 BPI
135 tracks per inch
80
2
in. )
in. )
in. )
1- 1