SEMA ELECTRONICS CO.,LTD
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 opera tion is inh ibited .
5.4.4 Read Data (MFM)
Read Data read out from the disk is transferred to the host system
in the sam e form as it was re ceived on the Wri te 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.
400 ns±20 %
Ta±0.5 % Tb±0.5 % Tc±0.5 %
Density Mode Ta (㎲)
(Typ.)
Tb (㎲)
(Typ.)
Tc (㎲)
(Typ.)
Density Transfer Rate
1.0MB 250 kbps 4 6 8
1.6MB 500 kbps 2 3 4
2.0MB 500 kbps 2 3 4