Robert Hancock wrote:
..
Currently the DMA, multi-sector mode, etc. are not controllable with
hdparm with libata. libata is designed to use the fastest settings
possible by default. In a lot of cases this messing with hdparm was only
needed because of stupidity with the old IDE code (like DMA not being
automatically enabled if the low-level driver was built modular).
Actually, most of the hdparm flags were put there to help test the IDE
subsystem and to help debug the much stranger hardware it had to deal with.
"DMA off by default" was a Linus Torvalds request, to help ensure data safety
with all of the weird and wonderful crap pre-standardization.
Cheers
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