read
for i in 
[11] [12];do sleep 10;echo $'\n\n' $i;hdparm -t /dev/sda1;done
write
for i in [11] [12];do sleep 10;echo $'\n\n' $i;date;time dd if=/dev/zero of=/tmp/hdparm_write$i.tmp ibs=1M obs=1M count=1024;date;done
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パラメータ修正例
hdparm -a 4096 -d 1 -r 0 -k 1 -u 0 -m 32 -c 1 -A 1 -P 0 -X 0 -W 1 -S 0 /dev/sda
