Anton Woldhek wrote:
>I'll venture a guess to say that there is a protection mechanism for bumps
>and stuff.
The hard drive is shock mounted, but you were talking about a buffer
memory. That's done for playback in portable music players. When
something comes off the disc garbled by a bump (as evidenced by a
high error rate being reported), there is time to read the disc again.
Pre-record buffers in field recorders are used, so far as I know, not
for error correction but as a convenience for operators who are
trying to catch real-time events. In that case the buffer holds what
is before the disc.
In order to repair bumps during recording, there would need to be
monitoring of the error rate of play-after-record. Hard drives are
fast enough to do that, for a few channels at once, anyway. Then the
bad sectors could be re-recorded from the circulating buffer. I don't
think it would be possible to distinguish between playback and record
errors...an intriguing question.
-Dan Dugan
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