Samsung 100737108-A , ,

Spinpoint M8-DVR OEM Product Manual REV 1.0

CHAPTER 5 DISK DRIVE OPERATION

This chapter describes the operation of the Spinpoint M8 hard d isk drive 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)

The Spinpoint M8 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 rotar y

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.

The Spinpoint M8 hard disk drive models and capacities are distinguished by the number of heads and

disks. The ST320LM001 have one (1) disk

and two

(2) read/write heads. The ST500LM012 has one (1) disk

and two (2) heads. The ST750LM022 have two (2) disks and three/four (3/4) read/write heads. The

ST1000LM024 has two (2) disks and four (4) read/write head s.

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 f or 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 (FDB)

assembly, disk mounting hub, and a labyrinth seal. The entire spindle motor assembly is

completely enclosed in the HDA and integrated to the base casting. The lab yrinth seal prevents bearing

lubricant from coming out into the HDA. The motor rotates the spindle shaft at 5400 rpm.