> The drive is clearly broken. Adding blacklist to drivers/ide/ide-dma.c
> for this model ("CD-912E/ATK") fixes this problem.
That may be the case but knowing if th drive is the problem is more
tricky.
Firstly try it on a different controller
Secondly check for other firmware revisions
Thirdly blacklist only your firmware rev if there are others
> hdc: DMA disabled
> ------------[ cut here ]------------
> kernel BUG at drivers/ide/ide-iops.c:949!
> invalid operand: 0000 [#1]
That is an IDE layer bug not a drive incompatibility. It may be one
triggered the other but until the BUG the kernel was correctly behaving
and had just turned off DMA anyway.
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