Sharp MZ-3500 service manual Floppy disk, Outline

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 pnciple 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:

1) Floppy disk nomenclature

Floppy disks called by different names dependng on the manufacturer

[>- Floppy media (or simply as medn) <•' Diskette

Floppy disk

2) Types of media

Four types are used at present depending on their storage capacity

(>- Single sided, double density (floppy disk-1)

[° Double-sided, double density (floppy disk-2D)

Single sided media index detect hole

Double sided media index detect hole

Front side- Feverse side

Head engage slit (do not touch)

Head 1 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 as write protect

Write protected
Front side	- No reflection (Write enable)

Write enabled

Front side

- (Reflect"n<! r«ywing)

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