Fujitsu MHC2032AT, MHD2021AT, MHC2040AT, MHD2032AT manual Spindle, Actuator, Air filter

4.2 Subassemblies

Head

2

0

1

MHD2021AT

Head

3

2

0

1

MHD2032AT

Head

0

1

2

3

MHC2032AT

Head

5

4

0

1

2

3

MHC2040AT

Figure 4.1 Head structure

4.2.3 Spindle

The spindle consists of a disk stack assembly and spindle motor. The disk stack assembly is activated by the direct drive sensor-less DC spindle motor, which has a speed of 4,000 rpm ±1%. The spindle is controlled with detecting a PHASE signal generated by counter electromotive voltage of the spindle motor at starting.

4.2.4 Actuator

The actuator consists of a voice coil motor (VCM) and a head carriage. The VCM moves the head carriage along the inner or outer edge of the disk. The head carriage position is controlled by feeding back the difference of the target position that is detected and reproduced from the servo information read by the read/write head.

4.2.5 Air filter

There are two types of air filters: a breather filter and a circulation filter.

The breather filter makes an air in and out of the DE to prevent unnecessary pressure around the spindle when the disk starts or stops rotating. When disk drives are transported under conditions where the air pressure changes a lot, filtered air is circulated in the DE.

The circulation filter cleans out dust and dirt from inside the DE. The disk drive cycles air continuously through the circulation filter through an enclosed loop air cycle system operated by a blower on the rotating disk.

C141-E050-02EN 4-3