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# Installing in a VirtualBox guest {#sec-instaling-virtualbox-guest}
Installing NixOS into a VirtualBox guest is convenient for users who
want to try NixOS without installing it on bare metal. If you want to
use a pre-made VirtualBox appliance, it is available at [the downloads
page](https://nixos.org/nixos/download.html). If you want to set up a
VirtualBox guest manually, follow these instructions:
1. Add a New Machine in VirtualBox with OS Type \"Linux / Other Linux\"
1. Base Memory Size: 768 MB or higher.
1. New Hard Disk of 8 GB or higher.
1. Mount the CD-ROM with the NixOS ISO (by clicking on CD/DVD-ROM)
1. Click on Settings / System / Processor and enable PAE/NX
1. Click on Settings / System / Acceleration and enable \"VT-x/AMD-V\"
acceleration
1. Click on Settings / Display / Screen and select VMSVGA as Graphics
Controller
1. Save the settings, start the virtual machine, and continue
installation like normal
There are a few modifications you should make in configuration.nix.
Enable booting:
```nix
boot.loader.grub.device = "/dev/sda";
```
Also remove the fsck that runs at startup. It will always fail to run,
stopping your boot until you press `*`.
```nix
boot.initrd.checkJournalingFS = false;
```
Shared folders can be given a name and a path in the host system in the
VirtualBox settings (Machine / Settings / Shared Folders, then click on
the \"Add\" icon). Add the following to the
`/etc/nixos/configuration.nix` to auto-mount them. If you do not add
`"nofail"`, the system will not boot properly.
```nix
{ config, pkgs, ...} :
{
fileSystems."/virtualboxshare" = {
fsType = "vboxsf";
device = "nameofthesharedfolder";
options = [ "rw" "nofail" ];
};
}
```
The folder will be available directly under the root directory.
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