Se o seu Virtual Box, você tem certeza de que instalou o essencial do convidado? Este é um requisito para o Virtual Box pegar pastas / compartilhamentos externos a partir do seu sistema operacional doméstico. Tenho quase certeza de que isso inclui dispositivos USB:
Shared folders These provide an easy way to exchange files between the host and the guest. Much like ordinary Windows network shares, you can tell VirtualBox to treat a certain host directory as a shared folder, and VirtualBox will make it available to the guest operating system as a network share, irrespective of whether guest actually has a network. For details, please refer to Section 4.3, “Shared folders”.
Instalação:
In the "Devices" menu in the virtual machine's menu bar, VirtualBox has a handy menu item named "Insert Guest Additions CD image", which mounts the Guest Additions ISO file inside your virtual machine. A Windows guest should then automatically start the Guest Additions installer, which installs the Guest Additions into your Windows guest. Other guest operating systems (or if automatic start of software on CD is disabled) need manual start of the installer.
Embora isso não pareça ser algo para o Mac agora:
Mac OS X guests: VirtualBox does not provide Guest Additions for Mac OS X at this time.
Este fórum pode ajudar: link
The way that I have found to solve this problem that seems to work almost every time is:
- Insert the USB drive,
- wait for OSX to mount the drive,
- eject the drive in Finder, and
- then select the Devices|USB Devices menu and select the USB drive to mount the drive.