Hey, old people of Twitter. How does a 3.5" floppy disk drive know where it should pulse the INDEX pin of the interface? On the drive I have it seems to pulse it at the same time but it doesn't seem to correlate at all with the first sector on the track.
well it’s also in space domain because shingled writes are physically in different locations on the platter
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To me it looks similar to OFDM, in which you also use FFT to modulate/demodulate overlapping channels.
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the channels in SMR aren’t orthogonal, there’s explicitly inter-channel interference, with OFDM i thought there was a requirement for subcarrier orthogonality
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I was curious about something and thought you might know: Why did high density perpendicular hard drives not appear earlier? That was demonstrated in a commercial product in 1984, then it didn't really reappear until 2006.
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Was it because it only really helps if you decrease head height over the platter, and manufacturing of smooth enough disks was a problem? The solutions that were found to that seem pretty obvious but maybe my perspective is skewed.
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am unsure, would need to look up information on requirements for read head, write head, and of media stackup and when those were developed; it’s likely that there was no need to go to perpendicular recording if areal density increase could be achieved with traditional recording
End of conversation
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