disable write cache

I need the possiblity to write files physically to disk as soon as possible.
The problem is that due to disk write caching files are written at undefined
times. After unplugging the power cord the disk may remain at undefined
states. I've already tried to disable caching via
IOCTL_DISK_SET_CACHE_INFORMATION but with no success. I'd really appreciate
some advice.
.

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