Sharp MZ-3500 Bedienungsanleitung PDF herunterladen (Seite 49)

MZ3500

o MFM method (double density)

The MFM method writes data on the basis of the condì

tion metntioned below, and it yields a data density two

times the data density of the MFM mode (The unneces

sary clock pulse is eliminated using this method )

(Condition) Clock IS written only when there is no data

Input data

0 ^ 0 ^ 0 1

JLJLJl

0 0

\ /\/\/\/\ /\ /\ /\ / \ / \ / \ /\ /

Write data

nnn

c c

^—

(C 1 '!) (Cl '!) ICI DU

1 > 1

< I 1

-------

---------------------------------

(u ;d (u

----

►(

It)

I 3m 2m

Data that follows Data that precedes

4 M

The clock pulse (C) will be eliminated in above illustra

tion as there is no data preceding or following the clock

Because the data rate is 2ps for this method, it is

possible to obtain twice the density of the FM method

(4ps).

NOTE Three types of write data cycle* (2i* j,<") i/is)

are used The read/write waveform is identical

to FM method

6) Media recording format

Media is formatted according to the IBM format

For Double side media, data is written on the front side

(head-1) and the reverse side (head-00)

Tracks, consists of 40 tracks, 00-39. (May also be called

cylinders)

Sector. 01-16

Recording density: 256 bytes/sector

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 115 116

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