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DISK DRIVE OPERATION
SpinPoint V40 Product Manual
23
CHAPTER 5 DISK DRIVE OPERATION
This chapter describes the operation of the SpinPoint V40 functional subsystems. It is intended as a guide to
the operation of the drive, rather than a detailed theory of operation.
5.1 Head / Disk Assembly (HDA)
A SpinPoint V40 hard disk drive consists of a mechanical sub-assembly and a printed circuit board assembly
(PCBA), as shown in Figure 5-1. This section describes the mechanism of the drive.
The head / disk assembly (HDA) contains the mechanical sub-assemblies of the drive, which are sealed
between the aluminum-alloy base and cover. The HDA consists of the base casting assembly (which
includes the DC spindle motor assembly), the disk stack assembly, the head stack assembly, and the rotary
voice coil motor assembly (which includes the actuator latch assembly). The HDA is assembled in a clean
room. These subassemblies cannot be adjusted or field repaired.
CAUTION: To avoid contamination in the HDA, never remove or adjust its cover
and seals. Disassembling the HDA voids your warranty.
SpinPoint V40 disk drive models and capacities are distinguished by the number of heads and disks. The
SV4002H has one (1) disk and two (2) read/write heads. The SV8004H has two (2) disks and four (4)
read/write heads.
5.1.1 Base Casting Assembly
A one piece, aluminum-alloy base casting provides a mounting surface for the drive mechanism and PCBA.
The base casting also serves as the flange for the DC spindle motor assembly. A gasket provides a seal
between the base and cover castings that enclose the drive mechanism.
5.1.2 DC Spindle Motor Assembly
The DC spindle motor assembly consists of the brush-less three-phase motor, spindle bearing assembly, disk
mounting hub, and a labyrinth seal. The entire spindle motor assembly is completely enclosed in the HDA
and screwed to the base casting. The labyrinth seal prevents bearing lubricant from coming out into the HDA.
The motor rotates the spindle shaft at 5400 rpm.