I have the following disk:

ad4: 9787MB <WDC AC310200R> [19885/16/63] at ata2-master using UDMA33

and am experiencing hangs when I run it with UDMA66.

I originally suspected this to be a cooling problem. But uncommenting
the hlt instruction and reducing the temperature by 10 deg C, didn't
help it.

I read the threads from Feb, where it was said that non IBM disks
had problems with the UDMA66 code in FreeBSD. Some of you said that
the disks worked just fine with other OSes.

I'd like to know if there has been a change in status of the UDMA66

The specific error messages before the hang:

ad4: READ command timeout - resetting
ata2: resetting devices



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