Fujitsu MHW2080BJ 用户手册

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. 

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 4.2.4. 

The PCA contains the control circuits for the disk drive.  The disk drive has one 
PCA.  For details, see Sections 4.3. 

The DE contains disks with an outer diameter of 65 mm and an inner diameter of 
20 mm. 

Servo data is recorded on each cylinder (total 162).  Servo data written at factory 
is read out by the read head.  For servo data, see Section 4.7. 

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 7,200 rpm 

±1%.  The spindle is controlled with detecting a PHASE 

signal generated by counter electromotive voltage of the spindle motor at starting. 

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 

C141-E259