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Posted by Gordon Burditt on 03/01/06 17:22
>Having used a Panasonic hard disc recorder for some months and making
>full use it its' editing facilities it occurs to me that there is no
>facilty for de-fragging the HD.
Video recorders CAN (not saying they DO, but they CAN) deal with
fragmentation in ways that computers can't. The often know ahead
of time how big the recording is going to be (approximately, even
though compression might be somewhat variable). Even if the user
starts recording with no timed stop, half an hour or an hour is a
pretty good guess. If it tries to allocate in half-hour chunks,
(freeing up extra if there is unused space when the recording stops)
there will be a lot less fragmentation than if it allocates in 8k
chunks.
A halfway decent filesystem can be defragged like this:
Delete everything you can.
A reasonable file system will recombine adjacent deleted chunks
into a single bigger deleted chunk.
It's hard to do with video recorders, but the extension of this is:
- Delete anything you don't need.
- Back up everything left.
- Delete everything.
- (optional) rebuild the filesystem from scratch.
- Restore everything.
>Is this an issue that could cause
>problems, as computer hard discs need de-fragging frequently?
I'll disagree with the statement that "computer hard disks need
de-fragging frequently". That may be true of Windows.
Gordon L. Burditt
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