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Date: Wed, 22 Apr 2009 00:26:53 +0200 (CEST)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Christopher Chambers <cchamb0@interchange.ubc.ca>
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Cc: questions@freebsd.org
Subject: Re: FreeBSD's interaction with MS-DOS partitions
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> ms-dos partition. For example, I attempted to download a torrent with
> ctorrent. Works perfectly if I am saving to the bsd partition but my
> whole system freezes if I use the ms-dos partition.
>
> I mount it in /etc/fstab as "/dev/ad0s2 /d msdosfs rw 0 0"
>
> Is this behaviour the result of the 0 0?

no. it's a result of ms-dos fs driver which is just useful to do 
read/write, even this isn't high performance ;)

mmap is probably buggy that's why rtorrent crash.
i don't think anyone really optimized this, not much need anyway.