Majed B. wrote:
How much RAM does your machine have? Write to the disk an amount that is larger than the amount of RAM and see if you get the same result. Also you can use hdparm to flush the caches before running dd the 2nd time.
See the meaning of the fdatasync option to dd and the /proc/sys/vm/drop_cache control. You are right about hdparm, but it only matters if you are using tiny data, drive caches are small.
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