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$ sudo hdparm -am /dev/sdg

/dev/sdg:
 multcount     =  0 (off)
 readahead     = 256 (on)
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$ sudo hdparm -m1 /dev/sdg

/dev/sdg:
 setting multcount to 1
 HDIO_SET_MULTCOUNT failed: Invalid argument
 multcount     =  0 (off)
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