I also have this issue. hdparm /dev/sda:
/dev/sda:
IO_support = 0 (default 16-bit)
readonly = 0 (off)
readahead = 256 (on)
geometry = 12161/255/63, sectors = 195371568, start = 0
hdparm -I /dev/sda |grep dma:
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poor performance hard disk IDE
https://bugs.launchpad.net/bugs/96693
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