Re: [OT] DVD read maximum at 3.5x, is this normal?

[Zhang Weiwu <zhangweiwu@realss.com>]

于 2010年11月15日 23:49, Joerg Schilling 写道:
> The numbers lead to a missconfigured kernel that does not support DMA.
>    

Thanks. You are right, I discovered this in kernel dmesg:

[    1.760318] ata2.00: ATAPI: HL-DT-ST DVDRAM GSA-H10A, JL02, max UDMA/33
[    1.760342] ata2.00: WARNING: ATAPI DMA disabled for reliability 
issues.  It can be enabled
[    1.760344] ata2.00: WARNING: via pata_ali.atapi_dma modparam or 
corresponding sysfs node.

but why DMA is not reliable is really off topic to this list. I'll ask 
elsewhere.