---
layout: docs
page_title: Vagrant Disk Usage
description: Various Vagrant Disk examples
---

# Basic Usage

Below are some very simple examples of how to use Vagrant Disks with the VirtualBox provider.

## Basic Examples

### Resizing your primary disk

Sometimes, the primary disk for a guest is not large enough and you will need to
add more space. To resize a disk, you can simply add a config like this below
to expand the size of your guests drive:

```ruby
config.vm.disk :disk, size: "100GB", primary: true
```

Note: the `primary: true` is what tells Vagrant to expand the guests main drive.
Without this option, Vagrant will instead attach a _new_ disk to the guest.

For example, this Ubuntu guest will now come with 100GB of space, rather than the default:

```ruby
Vagrant.configure("2") do |config|
  config.vm.define "hashicorp" do |h|
    h.vm.box = "hashicorp/bionic64"
    h.vm.provider :virtualbox

    h.vm.disk :disk, size: "100GB", primary: true
  end
end
```

It should be noted that due to how VirtualBox functions, it is not possible to shrink
the size of a disk.

### Attaching new hard disks

Vagrant can attach multiple disks to a guest using the VirtualBox provider. An example
of attaching a single disk to a guest with 10 GB of storage can be found below:

```ruby
Vagrant.configure("2") do |config|
  config.vm.define "hashicorp" do |h|
    h.vm.box = "hashicorp/bionic64"
    h.vm.provider :virtualbox

    h.vm.disk :disk, size: "10GB", name: "extra_storage"
  end
end
```

Optionally, if you need to attach many disks, you can use Ruby to generate multiple
disks for Vagrant to create and attach to your guest:

```ruby
Vagrant.configure("2") do |config|
  config.vm.define "hashicorp" do |h|
    h.vm.box = "hashicorp/bionic64"
    h.vm.provider :virtualbox

    (0..3).each do |i|
      h.vm.disk :disk, size: "5GB", name: "disk-#{i}"
    end
  end
end
```

Note: VirtualBox has a hard limit on the number of disks that can be attached
to a given storage controller, which is defined by the controller type.
Attempting to configure more disks than are supported by the primary
controller will result in a Vagrant error.

### Attaching optical drives

Vagrant can attach `.iso` files as optical drives using the VirtualBox provider.
An example of attaching an optical drive to a guest can be found below:

```ruby
Vagrant.configure("2") do |config|
  config.vm.define "hashicorp" do |h|
    h.vm.box = "hashicorp/bionic64"
    h.vm.provider :virtualbox

    h.vm.disk :dvd, name: "installer", file: "./installer.iso"
  end
end
```

As with hard disks, configuring more disks than are supported by your VM's
storage controller arrangement will result in a Vagrant error.

### Removing Disks

If you have removed a disk from your Vagrant config and wish for it to be
detached from the guest, you will need to `vagrant reload` your guest to apply
these changes. **NOTE:** Removing virtual hard disks created by Vagrant will
also delete the medium from your hard drive.