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Computers
The Platters: Platters are the actual disks inside the drive
that store the magnetized data. Conventional platters are made of a light aluminum
alloy and coated with magnetize-able material but latest technology uses glass
or ceramic platters as they are thinner and also heat resisting. Most drives
have at least two platters and the larger the storage capacity of the drive,
the more platters there are.
The Spindle Motor: Hard disk drive consists of a spindle
on which the platters spin at a constant RPM. Moving along and between the platters
on a common arm are read-write heads. The platters in a drive are divided by
disk spacers and are clamped to a revolving spindle that turns all the platters
in a uniform motion.
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The Read/Write Heads: Read/write heads read and write
data to the platters, and each head is fixed to a single actuator shaft so that
all the heads move in harmony. Typically, only one of the heads is active at
a time either reading or writing data. When not in use, the heads are inactive,
but when in motion the spinning of the platters generate air pressure that lifts
the heads off the platters. The Head Actuator: All the heads are attached to a
single head actuator arm, which moves the heads around the platters. The Actuator
arm moves the heads on an arc across the platters as they spin, allowing each
head to access almost the entire surface of the platter.
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