From: erik quanstrom <quanstro@quanstro.net>
To: 9fans@9fans.net
Subject: Re: [9fans] Bizarre freeze
Date: Tue, 5 Aug 2008 15:01:30 -0400 [thread overview]
Message-ID: <eaab38172bc39a6c03a6f2b05f20788e@quanstro.net> (raw)
In-Reply-To: <13426df10808051126t3f517cdcj2d13be003d6ba877@mail.gmail.com>
>> I wonder why there is a command to turn on DMA on disks. Could
>> it be that some disks don't work with DMA on?
>
> sure. it's PC hardware, so it's crap :-)
> ron
the ata spec does not require dma for pata devices.
sata, first specified in ata 7, requires udma mode 5,
though sata:pata bridges routinely do not.
it's impossible to know without a bit more information,
but the dma command may be a red herring.
> sdC0 is a cdrom. I can turn dma on for my sata disks (sdE0/sdF0) no problem.
can you access the cdrom at all? i'm wondering if
you're accessing a ahci-capable chipset in ahci *and*
ata modes at the same time.
- erik
next prev parent reply other threads:[~2008-08-05 19:01 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-05 18:01 sqweek
2008-08-05 18:16 ` Sape Mullender
2008-08-05 18:26 ` ron minnich
2008-08-05 19:01 ` erik quanstrom [this message]
2008-08-07 10:17 ` matt
2008-08-05 19:49 erik quanstrom
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