If a diskette having 26 sectors and 128 data bytes per sector is rotated at 360 rpm. the average transfer rate is approximately
26 x 128 x 360/60 =19,968 bytes/second
which gives an average period of about 50 µs.Taking into account the
gaps, the actual period for transferring a byte is normally 32 µs
(or 4 µs per bit).Although it would be possible to perform transfers
at this rate without a DMA controller, it is much more efficient to use
one.
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