Flash drive in OpenBSD: "specified device does not match mounted device"

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http://unix.stackexchange.com – I'm a relative BSD newb. I have a small server running OpenBSD 4.4. I'm trying to plug in a 16GB USB flash drive to move some files. I followed the guidance of the Disk Setup documentation, and found the label and filesystem of the desired partition. But when trying to mount the partition, I get the following: # mount -t ext2fs /dev/sd1i /mnt/flash mount_ext2fs: /dev/sd1i on /mnt/flash: specified device does not match mounted device I googled a bit, but nothing I found was particularly helpful. Can anyone shed some light on this message? (HowTos)