Mounting an SD card

[jnojr]

I have an SD card that contains a Linux install to run a printer. It's going into a secure lab, and so must be virus-scanned first. Yes, it's stupid, but dem's da rules. Because it's a Linux filesystem, my Mac can't read it, so I decided to mount it to a Linux VM. I used

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sudo VBoxManage internalcommands createrawvmdk -filename VirtualBox\ VMs/Debian/xerox.vmdk -rawdisk /dev/disk3

and chowned the resulting xerox.vmdk file to me so I could read it. I grabbed the UUID, created an entry in the .vbox file, and tried to add it to the VM, but am getting

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Failed to open the hard disk /Users/jnojr/VirtualBox VMs/Debian/xerox.vmdk.

Permission problem accessing the file for the medium '/Users/joliver/VirtualBox VMs/Debian/xerox.vmdk' (VERR_ACCESS_DENIED).

Result Code: VBOX_E_FILE_ERROR (0x80BB0004)
Component: Medium
Interface: IMedium {29989373-b111-4654-8493-2e1176cba890}
Callee: IVirtualBox {3b2f08eb-b810-4715-bee0-bb06b9880ad2}
Callee RC: VBOX_E_OBJECT_NOT_FOUND (0x80BB0001)

Any suggestions appreciated!