}
} > } >> Sure they can. I actually seen it done in movies. And besides, I've read
} >> it was possible on the internet.
} >
} > And at them is Jedi Knights with laser swords, I saw it in movies ;-).
} >
} > 1. Usual MFM technology is not sensitive to a direction of a magnetic
} > field. It can recognise only presence of a field, but not written down
} > 0 or 1. Optical methods do not possess necessary accuracy, because of
} > diffraction limit.
}
} That might be true if the direction of the field was what was used to denote
} ones and zeros. In fact it's a frequency encoding, which is why it's
} called Frequency Modulation. I forget if it's ones or zeros that use the
} higher frequency, but the fact that one uses a higher frequency means that
} increased storage density is possible by using encodings that have a high
} percentage of one or the other--that's the basis for RLL encoding.
In classic FM the 1s are double the frequency of 0s. In modified FM it
is more complicated, and of course RLL is even more so.
Naturally, these technologies are ancient and this has relatively little
relevance to modern hard drives anyway.
cheers,
-*-
Charles M. Kozierok (mailto:
[email protected] -- remove "X"s to mail)
Webslave, The PC Guide - <
http://www.PCGuide.com>
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