Sometimes flush disk cache could be needed. There are some tricky approaches to do it. Firstly, use sync command for writes any data buffered in memory out to disk. After that you need some changes in proc file system: sync echo 3 | sudo tee /proc/sys/vm/drop_caches   Remember, that above method is only flush cache. After this command FS will start write cache again. If you want disable caching at all do next: sync blockdev --flushbufs /dev/sda hdparm -F /dev/sda echo 1 > /sys/block/sdX/device/delete   blockdev and hdparm seems with same functionallity but it will not be excess. After your changes: reboot  
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