1 Apr 2002 chexum   » (Master)

Waldo: hdparm -X does not do what you suppose it does. -X needs to be 64+UDMA mode, i.e. -X 68 for UDMA66, -X 69 for UDMA100 (udma5 in hdparm -i). And you shouldn't go higher than your chipset allows. I was bitten by this when I moved a hard disk to another VIA-based computer, and the VIA chipsets are sometimes too similar to detect their incapabilities, and using UDMA100 timings on an UDMA66 chipset wreaked havoc on the (duplicate, fortunately) data on the disk.

At least my hdparm works this way, if I'm not misinterpreting the manual page :)

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