How to enable DMA on UltraBay disk on a Thinkpad T43p

I recently reinstalled Gentoo Linux on my Thinkpad, using a second disk, with my old disk mounted in the UltraBay slot. I found that I could not enable DMA on the old disk, which made most operations (for example, copying my quite large home directory) unbearably slow. I just found the solution in the always-useful ThinkWiki: add “hdc=noprobe” to my kernel boot parameters, which disables the IDE driver on it and makes the ata_piix driver handle it. Now things are back to normal speed.

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