Fujitsu MAX3036RC Benutzerhandbuch

C141-E237 

1-5 

 

The HDDs have a disk enclosure (DE) and a printed circuit assembly (PCA).  The DE includes heads 
on an actuator and disks on a spindle motor mounted on the DE.  The PCA includes a read/write 
circuit and a controller circuit. 

 
 
(1) Disks 

 

The disks have an outer diameter of 70 mm (2.8 inch) and an inner diameter of 25 mm (0.98 inch). 

 

The disks are good for at least 50,000 contact starts and stops. 

 
 
(2) Heads 

 

The MR (Magnet – Resistive) of the CSS (contact start/stop) type heads are in contact with the disks 
when the disks are not rotating, and automatically float when the rotation is started. 

 
 
(3) Spindle 

motor 

 

The disks are rotated by a direct-drive hall-less DC motor.  The motor speed is controlled by a 
feedback circuit using the counter electromotive current to precisely maintain the specified speed. 

 
 
(4) Actuator 

 

The actuator, which uses a rotary voice coil motor (VCM), consumes little power and generates little 
heat.  The heads at the end of the actuator arm are controlled and positioned via feedback servo loop. 

 
 

The heads are positioned on the CCS zone over the disks when the power is off or the spindle motor 
is stopped. 

 
 
(5) Read/write 

circuit 

 

The read/write circuit utilizes a read channel mounted with a head IC that supports high-speed 
transmission and an MEEPR4ML (Modified Enhanced Extended Partial Response Class 4 Maximum 
Likelihood) modulation/demodulation circuit in order to prevent errors being triggered by external 
noise and to improve data reliability. 

 
 
(6) Controller 

circuit 

 

The controller circuit uses LSIs to increase the reliability and uses a high speed microprocessing unit 
(MPU) to increase the performance of the SAS controller.