Basic Principles of Operation
5-3
Quantum Fireball Plus AS 10.2/20.5/30.0/40.0/60.0 GB AT
5.1.1
5.1.1
5.1.1
5.1.1
Base Casting Assembly
Base Casting Assembly
Base Casting Assembly
Base Casting Assembly
A single-piece, e-coated, aluminum-alloy base casting provides a mounting surface
for the drive mechanism and PCB. The base casting also acts as the flange for the
DC motor assembly. To provide a contamination-free environment for the HDA, a
gasket provides a seal between the base casting, and the metal cover that encloses
the drive mechanism.
5.1.2
5.1.2
5.1.2
5.1.2
DC Motor Assembly
DC Motor Assembly
DC Motor Assembly
DC Motor Assembly
Integral with the base casting, the DC motor assembly is a fixed-shaft, brushless DC
spindle motor that drives the counter-clockwise rotation of the disks.
5.1.3
5.1.3
5.1.3
5.1.3
Disk Stack Assemblies
Disk Stack Assemblies
Disk Stack Assemblies
Disk Stack Assemblies
The disk stack assembly in the Quantum Fireball Plus AS hard disk drives consist
of disks secured by a disk clamp. The aluminum-alloy disks have a sputtered thin-
film magnetic coating.
A carbon overcoat lubricates the disk surface. This prevents head and media wear
due to head contact with the disk surface during head takeoff and landing. Head
contact with the disk surface occurs only in the landing zone outside of the data
area, when the disk is not rotating at full speed. The landing zone is located at the
inner diameter of the disk, beyond the last cylinder of the data area.
1. For user data, zone 15 is the innermost zone and zone 1 is the outermost zone.
Table 5-1
Table 5-1
Table 5-1
Table 5-1
Cylinder Contents
CYLINDER
CYLINDER
CYLINDER
CYLINDER
CONTENTS
CONTENTS
CONTENTS
CONTENTS
ZONE
ZONE
ZONE
ZONE
1
NUMBER
NUMBER
NUMBER
NUMBER
OF TRACKS
OF TRACKS
OF TRACKS
OF TRACKS
SECTORS
SECTORS
SECTORS
SECTORS
PER TRACK
PER TRACK
PER TRACK
PER TRACK
DATA RATE
DATA RATE
DATA RATE
DATA RATE
System Data
0
65
345
302.0
1
2348
694
490.0
2
2342
690
486.7
3
2342
676
476.9
4
2342
666
466.7
5
2342
651
456.7
6
2342
636
446.7
7
2342
616
433.3
8
2342
598
420
9
2342
592
406.2
10
2342
551
387.7
11
2342
522
365.7
12
2342
493
344.0
13
2342
453
317.7
14
2342
419
292.5
15
2342
375
262.5
Summary of Contents for FIREBALL PLUS AS 10.2
Page 12: ...About This Manual 1 4 Quantum Fireball Plus AS 10 2 20 5 30 0 40 0 60 0 GB AT ...
Page 16: ...General Description 2 8 Quantum Fireball Plus AS 10 2 20 5 30 0 40 0 60 0 GB AT ...
Page 61: ...Basic Principles of Operation Quantum Fireball Plus AS 10 2 20 5 30 0 40 0 60 0 GB AT 5 16 ...
Page 62: ...Basic Principles of Operation 5 17 Quantum Fireball Plus AS 10 2 20 5 30 0 40 0 60 0 GB AT ...
Page 162: ...Index I 4 Quantum Fireball Plus AS 10 2 20 5 30 0 40 0 60 0 GB AT ...