Theory of Device Operation
4.1 Outline
This chapter consists of two parts. First part (Section 4.2) explains mechanical assemblies of the disk drive. Second part (Sections 4.3 through 4.7) explains a servo information recorded in the disk drive and drive control method.
4.2 Subassemblies
The disk drive consists of a disk enclosure (DE) and printed circuit assembly (PCA).
The DE contains all movable parts in the disk drive, including the disk, spindle, actuator, read/write head, and air filter. For details, see Subsections 4.2.1 to 4.2.5.
The PCA contains the control circuits for the disk drive. The disk drive has one PCA. For details, see Sections 4.3.
4.2.1 Disk
The DE contains disks with an outer diameter of 65 mm and an inner diameter of 20 mm. The MHN2300AT and MHN2200AT have two disks and MHN2150AT and MHM2100AT have one disk.
Servo data is recorded on each cylinder (total 120). Servo data written at factory is read out by the read head. For servo data, see Section 4.7.
4.2.2 Head
Figure 4.1 shows the head structures. MHN2300AT has 4 heads and MHN2200AT has 3 heads and MHN2150AT and MHN2100AT have 2 heads.
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