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From: Graham Murray <graham@gmurray.org.uk>
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Subject: Re: [gentoo-user] /dev/sda* missing at boot
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Michael Mol <mikemol@gmail.com> writes:

> Also, check your BIOS to see if it's running your SATA controller in
> some kind of IDE emulation mode. If it is, disable that. (Some
> motherboards let you choose between "IDE" and "RAID", where "RAID" is
> AHCI mode. Others call IDE mode 'legacy', and still others might
> actually call the AHCI mode 'AHCI')

That is if the BIOS will allow you to do so. Some BIOSes, for example
some Dell servers, will only run SATA in emulation mode despite the
chipset supporting AHCI. The only option they give for SATA is
enable/disable.