Find Linux hard drive speed

wget -P /data/soft/ http://sg.danny.cz/sg/p/sg3_utils-1.44.tar.xz
cd /data/soft/
xz -d sg3_utils-1.44.tar.xz
ls -lsa
sg3_utils-1.44.tar
tar -xvf sg3_utils-1.44.tar
cd sg3_utils-1.44
./configure
make
make install
fdisk -l |grep sd*
sg_vpd -all /dev/sdb |grep rpm
显示结果：
Nominal rotation rate: 7200 rpm