Samsung SFD-321B specifications Track, Write Protect, Read Data MFM

FLOPPY DISK DRIVE SPECIFICATION

PAGE	20
MODEL	SFD-321B

5.4.2 Track 00

"LOW" level of this signal indicates the head is on Track 00 position and stepping motor is at the specified position respectively.

5.4.3 Write Protect

When a write-protected disk is inserted, this signal becomes "LOW" and the data on the disk is protected from mis-erasing and

the write operation is inhibited.

5.4.4 Read Data (MFM)

Read Data read out from the disk is transferred to the host system

in the same form as it was received on the Write Data line. Each flux reversal sensed on the disk produces the only transition from "HIGH" level to "LOW" level. For the seperation of the clock bits from the data, the leading edge of a change from "HIGH" to "LOW" level is used.

Ta±0.5 %

Tb±0.5 %

Tc	0.5 %
		400	ns±20 %
±

Density Mode			Ta	㎲	㎲	Tc (	㎲	)
				( )	Tb ( )
Density	Transfer Rate		(Typ.)		(Typ.)	(Typ.)
1.0MB	250	kbps		4	6	8
1.6MB	500	kbps		2	3	4
2.0MB	500	kbps		2	3	4

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