Mounting a USB stick with VirtualBox
I used VirtualBox to create a bootable USB key with FreeBSD using VirtualBox on my Mac. Here are a few issues I ran into.
USB2 is not supported by VirtualBox
VirtualBox does not support USB2 by default. If you try to mount a USB device, you will get a warning that it requires 'Oracle VM VirtualBox Extension Pack'. Download from the VirtualBox website and install extension pack by simply dragging it to the VirtualBox application.
Determine the mount location of the disk
The mount location of the USB disk is determined by your operating system and presently available hardware. The names typically take these forms:
/dev/disk2on Mac OS X
If the USB key is already mounted, these tools list the mounted disks:
mounton Linux and FreeBSD
diskutil liston Mac OS X
Mac does not fully unmount USB stick
Problem: Ejecting a disk in the Finder only ejects the partition, but does not unmount the whole disk.
Solution: determine the disk, and unmount using diskutil:
diskutil list diskutil unmountDisk /dev/disk2
No USB devices found
Deattach USB disk from host computer, and attach to to Virtual Box.
- Installer shows up, but I can't select a USB disk. Even after rescanning, and checking the fixit menu, it gaves an error "No USB devices found".
- I installed FreeBSD on virtual disk, instead of USB disk. Succeeded.
Booted FreeBSD in VirtualBox, and attached USB disk. Error:
uhub_reattach_port: port 1 reset failed, error=USB_ERR_TIMEOUT uhub_reattach_port: device problem (USB_ERR_TIMEOUT), disabling port 1
Seems a bug in VirtualBox. See issue #8182
In VirtualBox settings (under ports > USB) Disable USB 2.0 (EHCI) Controller.
Reboot the Virtual box.
Now the USB key works fine in FreeBSD, and is made available at