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#602727
[root@localhost opt]# hdparm -Tt /dev/sda
/dev/sda:
Timing cached reads: 4402 MB in 2.00 seconds = 2203.47 MB/sec
Timing buffered disk reads: 118 MB in 3.03 seconds = 38.93 MB/sec
[root@localhost opt]# hdparm -cd /dev/sda
/dev/sda:
[root@localhost opt]# hdparm -I /dev/sd
sda sda1 sda2 sda3 sda5
[root@localhost opt]# hdparm -I /dev/sda
/dev/sda:
HDIO_DRIVE_CMD(identify) failed: Invalid argument