Raw Disk on USB Drive

[MrGuilt]

Hi!

I'm trying to use a raw disk image that is on a USB drive. I'm using VirtualBox 3.1.6. The command I'm using it:

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vboxmanage internalcommands createrawvmdk -filename ~/Documents/lcp.vmdk -rawdisk /dev/disk1s1 -register

What I get back is:

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Error opening the raw disk '/dev/disk1s1': VERR_RESOURCE_BUSY
The raw disk vmdk file was not created

What's particularly frustrating is I can find few references to VERR_RESOURCE_BUSY on Google, mostly in the code.

Any idea what I need to do to get past this?

thanks,
Charles

[stefan.becker]

Probably the drive is mounted on the host?