I have tried -ac6 with no luck.
> hmm .. may be you did some hot hdparm settings ?
>
> how about none hdparm settings ?
My hdparm setting are conservative:
/dev/hda:
 multcount    =  0 (off)
 I/O support  =  0 (default 16-bit)
 unmaskirq    =  0 (off)
 using_dma    =  0 (off)
 keepsettings =  0 (off)
 nowerr       =  0 (off)
 readonly     =  0 (off)
 readahead    =  8 (on)
 geometry     = 5606/255/63, sectors = 90069840, start = 0
-
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