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M Z 3500
5. MFD INTERFACE
5-1. Outline
Floppy disk is a disk which is made of a mylar sheet whose
surface is coated with magnetic particles and set on the
device to write and read data on the surface of the disk.
It will be necessary to know operating priciple of the
floppy disk unit and operational description, including
recording method and format.
5-2. Floppy disk
As various recording methods and formats are used for
floppy disk (F.D.) Systems we will discuss some of them.
3) Components of FD's:
Head engage slit
(do not touch)
1) Floppy disk nomenclature
Floppy disks called by different names dependng on the
manufacturer.
fo Floppy media (or simply äs media)
•jo Diskette
[o Floppy disk
2) Types of media
Four types are used at present depending on their
storage capacity:
fo Single-sided, double density (floppy disk-1)
}o Double-sided, double density (floppy disk-2D)
Smgle-sided media Index detect hole
;
Double-sided media index detect hole
Front side-
Head-1
Feverse side
Head-0
4) Write protect notch
Different write protects are adopted depending on the
drive unit used.
Example-1:
In the case of the CE331 the presence of
light reflection is sensed by the photo-
coupler and decoded äs write protect.
Write protected
Front side
O
0
-No reflection (Write-enable)
Write enabled
Front side
O
- (Reflactirv» ros'ing)
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