USB can't mount msdosfs drive

Joseph Mays mays at
Wed Jun 5 17:50:01 UTC 2013

>> WARNING: mount of da2s1 denied due to unsupported optional features

> That's odd, because that warning comes from ext2fs not msdosfs. Do you
> use ext2fs anywhere?
> What version of FreeBSD is this? And is this just a standard installation
> or do you compile your own kernel?

root at warehouse:/root # uname -a
FreeBSD warehouse 9.1-RC1 FreeBSD 9.1-RC1 #0: Tue Aug 14 04:25:06 UTC 2012 
root at  amd64

No, I didn't compile my own kernel. The USB stick in question was stuck into 
the back of a redhat linux box. Okay, I did actually try also mounting it 

mount -t ext2fs /dev/da2s1 /usb2

just to see what would happen. After trying it a couple more times I see 
that was what was adding the that warning to dmesg. So that's explained, but 
I still don't understand why I can't mount it with mount_msdosfs

-----Original Message----- 
From: Tijl Coosemans
Sent: Wednesday, June 05, 2013 1:36 PM
To: Joseph Mays
Cc: freebsd-questions at
Subject: Re: USB can't mount msdosfs drive

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