DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTSReferring now to the drawings, and more particularly to FIG. 1, there is shown a data storage system 20 with the cover 23 removed from the base 22 of the housing 21. A data storage system 20, as shown in FIG. 2, typically includes one or more rigid data storage disks 24 which are stacked coaxially in a tandem spaced relationship, and rotate about a spindle motor 26 at a relatively high rate of rotation. Each disk 24 is typically formatted to include a plurality of spaced concentric tracks 50, with each track being partitioned into a series of sectors 52 which, in turn, are further divided into individual information fields. One or more of the disks 24 may alternatively be formatted to include a spiralled track configuration.
An actuator 30 typically includes a plurality of interleaved actuator arms 28, with each arm having one or more transducer 27 and slider 35 assemblies mounted to a load beam 25 for reading and writing information to and from the data storage disks 24. The slider 35 is typically designed as an aerodynamic lifting body that lifts the transducer 27 off of the surface of the disk 24 as the rate of spindle motor 26 rotation increases, and causes the transducer 27 to hover above the disk 24 on an air bearing produced by high-speed rotation of the disk 24. A conformal lubricant may alternatively be disposed on the disk surface 24 to reduce static and dynamic friction between a constant contact-type slider 35 and disk surface 24.
The actuator 30 is usually mounted to a stationary actuator shaft 32, and rotates on the shaft to move the actuator arms 28 into and out of the stack of data storage disks 24. A coil assembly 36, mounted to a coil frame 34 of the actuator 30, generally rotates within a gap 44 defined between the upper and lower magnet assemblies 40 and 42 of a permanent magnet structure 38, causing the actuator arms 28, in turn, to sweep over the surface of the data storage disks 24. The spindle motor 26 typically comprises an a.c. motor or, alternatively, a poly-phase brushless d.c. motor, energized by a power supply 46 and adapted for rotating the data storage disks 24.
The coil assembly 36 and the upper and lower magnet assemblies 40 and 42 of the permanent magnet structure 38 operate in cooperation as an actuator voice coil motor 39 responsive to control signals produced by a controller 58. The actuator voice coil motor 39 produces a torquing force on the actuator coil frame 34 when control currents of varying direction and magnitude flow in the coil assembly 36 in the presence of a magnetic field produced by the permanent magnet structure 38. The torquing forces imparted on the actuator coil frame 34, in turn, cause corresponding rotational movement of the actuator arms 28 in directions dependent on the polarity of the control currents flowing in the coil assembly 36. A controller 58 preferably includes control circuity that coordinates the transfer of data to and from the data storage disks 24, and cooperates with the actuator voice coil motor 39 to move the actuator arms 28 and transducers 27 to prescribed track 50 and sector 52 locations when reading and writing data to and from the disks 24.
Referring to FIG. 3, there is illustrated a data storage system 20 having a relatively small form factor, and having housing 21 dimensions generally conforming to one of the PCMCIA housing specifications previously discussed. The compact packaging configuration of small and very small form factor data storage systems 20 typically provides for only minimal separation distances and tolerances between adjacently mounted system components. The vertical or height dimension for a PCMCIA Type-II housing, for example, is specified as being 5 mm. Accordingly, the stiffness characteristics of the outwardly extending actuator arms 28 of an actuator comb assembly 30 become of paramount importance as the disk-to-disk spacing is reduced to accommodate the reduction in data storage system housing dimensions. Actuator arm 28 stiffness is also of critical importance in standard data storage systems having an increased number of data storage disks 24 and reduced disk-to-disk spacing dimensions.
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Hoover HOOVER 43143046 ACTUATOR ARM,U6630
Click is usually actuator arm not head crash2013-04-26 12:55:58 by RobNLA
The click can mean a head crash happened, and it may indicate that the head is being dragged on the platter, but it's not actually from the head hitting the platter.
In modern drives the clicking is almost always a result of the arm sweeping back and forth over the disk trying to get position data. The clicking sound is the back end of the actuator arm hitting the stop that constrains the arm's range of movement.
The clicking sound is usually caused by one of these:
1. Spindle motor failure/stuck spindle/bad power to motor
2. Circuit board failure
3. Read/write head failure
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