j.
Low pass filter.
1.3.2
Drive mechanism
The
drive motor under servo speed control (using a frequency generator) rotates
the spindle motor at 300 or 360 r.p.m. through a direct-drive system. An expandable
collet/spindle assembly provides precision media positioning to ensure data
interchange.
1.3.3
Positioning mechanics
The read/write head assembly is accurately positioned through the use of a leading
screw which is attached to the head carriage assembly. Precise track location is
accomplished as the head carriage is moved by the precise discrete rotation of a
stepping motor.
1.3.4
Read/write heads
The proprietary heads are single-element ceramic read/write heads with tunnel
erase elements to provide erased areas between the data tracks. Thus, normal
interchange tolerances between media and drives will not degrade the signal-to-
noise ratio and diskette interchangeability is ensured.
The heads are mounted on a carriage which is located on precision guide rods. The
diskette is held on a plane perpendicular to the read/write heads by a plate located
on the base casting. This precise registration assures perfect compliance with the
read/write heads. The read/write heads are in direct contact with the diskette. The
head surface has been designed to obtain maximum signal transfer to and from the
magnetic surface of the diskette with minimum head/diskette wear.
1.3.5
Recording formats
The formats of the data written on the diskette are totally a function of the host
system. The formats can be designed around the user's application (FM or MFM) to
take complete advantage of the total available bits that can be written on any track.
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Leaflet No. 9419 26/4/97 6:09 pm Page 6
