why my OCZ ATV 8 GB is so slow in FreeBSD

I have OCZ ATV 8GB and I use this USB Flash Drive in FreeBSD , openBSD , Debian , Fedora , Windows XP , windows Vista 64 bit ,
but speed of copy and paste in FreeBSD is very low
and this USB Flash Drive is so slow and I can copy file and move files with 6 MB/s , but I can copy files with 33 MB/s in Debian and Windows ,
I see this Flash drive is so slow in FreeBSD
 
can this happen , because of driver for this device make in FreeBSD ?
can I have better speed when I use FreeBSD 7 or FreeBSD 8 ?
 
I'm using FreeBSD7, built March 19th (7.2-PRERELEASE). Haven't had any USB speed issues previously, though.
 
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