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Write Operation
The data write operation beings with ID read to find the specified sector.
Open a write gate and right the data at the place where the ID field is
found.
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The write data is sent from the host to RAM and from RAM to the NDC 840,
where it is converted into serial data.
Then, while the ECC
(error correc-
tion code)
generator generates the ECC, the data are sent to the MFM genera-
tor (NDC 842)
for conversion into an MFM pattern.
Finally, the data are
sent to the disk.
The ECC is tagged onto the end of the data and also
sent to the-disk.
VII - 26
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Troubleshooting
