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:
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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