[OT] raw-disk and cache-buffer

excuse me.. it's very simple question, but very strange too
so I can't find information about it

if I use raw disk (like cat xxx > /dev/sda), how can I know when the data is written over the disk?

does have any sense using sync?

is there some cache-buffer in use anyway, or is data immediately written on disk?


i know this is not very -development question-, I hope it's a interesting question anyway.
bye
.

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