Sharp MZ-3500 service manual VnVn n nV nnn7, Ci D ci Ici

MZ3500

o MFM method (double density)

The MFM method writes data on the basis of the condi tion metntioned below, and it yields a data density two

times the data density of the MFM mode (The unneceb sary clock pulse is eliminated using this method ) (Condition) Clock is written only when there is no data

0	£	0 £ 0	1	0 •'•> 0	1	1	1	0	1	0 ^ 0
Input data			n		n		n	n	n
\ /\ /\ X"V /\ /										n/
Write data	n	n	nnn	' VnVn n nV nnn7
	C	C	(C) I) (C)	'(_	[ci D (ci		u ici	,i> ci	(0 ;i> (c)	(O
					<	i		i	i
		Data thattfollows Data\that precedes

The clock pulse (Ci will be eliminated in above illustra tion as there is no data preceding or following the clock Because the data rate is 2/Js for this method, it is possible to obtain twice the density of the 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)

NOTE Three types of write data cycl»- (2f ~>t"> SA*S) are used The read/write waveform is identical

to FM method

Floppy disk

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

Sector. 01-16

Recording density: 256 bytes/sector