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 120-test:/# apt-get install hdparm
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120-test:/home/lai# hdparm -t /dev/sda
/dev/sda:
 Timing buffered disk reads:  346 MB in  3.02 seconds = 114.65 MB/sec
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120-test:/home/lai# hdparm -T /dev/sda
/dev/sda:
 Timing cached reads:   2786 MB in  2.00 seconds = 1393.80 MB/sec
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121:~# hdparm -t /dev/sda
/dev/sda:
 Timing buffered disk reads:  310 MB in  3.01 seconds = 102.89 MB/sec
121:~# hdparm -T /dev/sda
/dev/sda:
 Timing cached reads:   2578 MB in  2.00 seconds = 1289.01 MB/sec
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lai@*:~$ sudo hdparm -t /dev/sda
/dev/sda:
 Timing buffered disk reads:  442 MB in  3.01 seconds = 146.89 MB/sec
lai@*:~$ sudo hdparm -T /dev/sda
/dev/sda:
 Timing cached reads:   8306 MB in  2.00 seconds = 4162.04 MB/sec
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HA:/home/lai# hdparm -t /dev/sda
/dev/sda:
 Timing buffered disk reads:  176 MB in  3.01 seconds =  58.51 MB/sec
HA:/home/lai# hdparm -T /dev/sda
/dev/sda:
 Timing cached reads:   2966 MB in  2.00 seconds = 1483.26 MB/sec
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153:/home/lai# hdparm -t /dev/sda
/dev/sda:
 Timing buffered disk reads:  186 MB in  3.00 seconds =  61.93 MB/sec
153:/home/lai# hdparm -T /dev/sda
/dev/sda:
 Timing cached reads:   3012 MB in  2.00 seconds = 1505.78 MB/sec
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hdparm -d1 /dev/hda ¿ªÆôDMA
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