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The creation of a shared folder involves selecting the folder on the host system which is be to shared, assigning a share name and choosing whether the folder is to be read-only and transient or permanent. Shared folders may also be declared as read-only to prevent the guest operating system from writing to the host folder. Shared folders can be configured such that they are persistent (in other words the share is still configured even if the guest is restarted) or transient (such that they a lost after the virtual machine is shutdown or rebooted). Shared folders are not supported on virtual machines running Windows 3.1, Windows 95, Windows Me or Windows 98 guests. VirtualBox folder sharing is currently only supported for Windows and Linux guests.
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In addition, assuming adequate permissions are granted on the shared folder, the guest is also able to transfer files onto the host by copying them into the shared folder.
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VirtualBox Shared Folders allow files residing on the host system to be accessed by guest operating systems running in virtual machines.
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