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Sharp MZ-1F19 Instruction Manual page 12

Mini-floppy disc drive

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(3) Write-Protect Notch
The write-protect notch is used to prevent erasure of data already written
on the floppy disk. Covering this notch with an opaque seal inhibits writing
to the floppy disk. However, the floppy disk can still be read. Some floppy
disk supplied by Sharp called the master has this notch covered by a seal.
Since the notch is covered to avoid trouble due to erroneous operation, do
not remove it unless necessary. Do not cover the notch with a seal if the
floppy disk is always written. The disk cannot be written if the notch is
covered.
Write-protected disk
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(4) Data Read/Write Operation
All that you have to do with the disk drive are to turn on and off the power
and to insert and remove the floppy disk. The data read/write operation is
controlled by the computer.
For details, refer to the manual for the software being used.
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