why won't write-behind stay disabled?

System.ini shows no obvious mention of write-behind.

Vcache settings:
maxfilecache=3072
chunksize=512
minfilecache=3072

Reasons are that I'm ways to inprove disk performance because I'm
tired of getting file system problems because my system too often
hangs up before data gets written to my drive (lost clusters and
orphaned pieces of files, etc.) I've tried everything else believe
me.

Second I'm tweaking my MTU/port settings for faster internet data
transfer. I was reading microsoft website about setting port speed
http://technet2.microsoft.com/Window...4f1a41033.mspx
when I read what this same article said about write-behind "You may
want to disable the write behind cache function, especially if you own
system critical applications, and ALWAYS shut down Windows AFTER
closing ALL running programs! This means all data will be immediately
written to disk, bypassing the cache." I take it from my reading that
write-behind is also implictated in problems with the data layer of
internet connections. I've been trying ever since to disable
write-behind.
Please if you wish to comment on my reasoning OK but help me disable
write-behind.