Hi,
I found this option in hdparm which is not supported by busybox hdparm
-F Flush the on-drive write cache buffer (older drives may
not implement this).
I did not verify the internals of hdparm -F but relying on the man
hdparm, I think that it is an interesting feature to implement also in
busybox hdparm. Especially for those device for which the shutdown can
be controlled with external hardware or forced brutally but need to
know that almost everything is saved up to that point.
I hope this helps, R-
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