I can't speak for the Dell engineers, but I rather suspect that they ship them that way so that the user can easily make use of the AHCI features that aren't available in ATA mode.
Then why wouldn't the default be set to just AHCI in the BIOS? AFAIK, IRRT does not add anything to AHCI capabilities or speed, other than RAID. But for single-drive E series laptops, for example, IRRT does not seem to make much sense (as the default option)...
jackshack
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January 7th, 2010 06:00
I can't speak for the Dell engineers, but I rather suspect that they ship them that way so that the user can easily make use of the AHCI features that aren't available in ATA mode.
djpenn
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December 8th, 2010 14:00
Then why wouldn't the default be set to just AHCI in the BIOS? AFAIK, IRRT does not add anything to AHCI capabilities or speed, other than RAID. But for single-drive E series laptops, for example, IRRT does not seem to make much sense (as the default option)...