Fujitsu MAV2036RC, MAV2073RC manual Hardware Structure

1.1 Standard Features

(20)Microcode downloading

The HDD implements the microcode download feature. This feature achieves easy maintainability of the HDD and function enhancing.

1.2Hardware Structure

The HDD is composed of the disks, heads, and spindle motor mounted disk enclosure (DE) with actuator as well as read/write pre-amp with the printed circuit assembly (PCA) of the controller.

(1)Disks

The disks have an outer diameter of 65 mm (2.56 inch).

(2)Heads

The heads have MR (Magnet-Resistive) read element Ramp Load type slider.

(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 ramp 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.

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