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1.2.2
~oadin9/Ejection,
Interlocks, and Sensors
Insert a flexible disk into the disk drive and close the
door.
When the door handle latches closed, a collet presses
into the hole of the flexible disk, centering it and clamp-
ing it in operating position on a spindle below.
By the
same action the drive motor receives dc power, it moves the
s~indle,
rotating the flexible disk at 360 revolutions per
mlnute (rpm).
Sensors in the disk drive detect the follow-
ing:
a.
That the flexible disk is properly inserted and the
door slot is closed.
b.
Whether
a single- or dual-sided flexible disk is
loaded.
c.
Whether the flexible disk has a write protect notch.
d.
Whether the magnetic head is located on the 00 track
o:f the disk.
An index sensor generates a pulse once for each rotation of
the flexible disk, providing a time reference.
Before you can unload the flexible disk, the BUSY lamp on
the front panel must be off.
The door slot does not open
if the flexible disk is being used by the host controller.
1.2.3
Dc Direct Drive Spindle Motor
The disk spindle is driven by a dc motor.
This direct drive
dc motor makes dr i ve bel ts
and pulleys
unnecessary,
and
minimizes the power required.
The motor provides a media
up-to-speed time of only 600 ms.
The flexible disk is accurately centered and clamped onto
the spindle by a collet.
Clamp pressure is relieved by
springs in both the spindle and collet to protect the flex-
ible disk even if it is warped.
1.2.4
Read/Write Heads
Data is written onto the flexible disk and read from it
using ceramic magnetic
read/write heads.
The read/write
heads are located on each side of the flexible disk and are
mounted on a
precision
guide-bar
carriage,
enabling
the
heads to be shifted from track to track.
During loading and
unloading of a flexible disk, the heads are held away from
the flexible disk surface.
1-3
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