And again, I seriously doubt that disk fragmention is the problem here. The access pattern simply isn't the kind that should produce enough fragmentation to matter. Not even on Windows.
It probably depends on how smart the PVR is.
The filesystem has a massive influence here too: if it performs delayed allocation, with a decent buffer-before-flush interval, then things will be written out in largish contiguous chunks regardless.
I doubt that fragmentation is the cause of the pixelated recordings. Surely the planet's most sold O/S can handle a few measly TV streams!
See, even as it's writing data out, the disk is still seeking around for metadata reads/writes. So fragmentation or not, it's never going to be doing a lot of sequential I/O. Especially not with 4-8 streams going at once.
This is more of a head-scheduling issue than a fragmentation issue.
Cheers
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