# Format disk

The Format disk step will partition and format the specified disk using the recommended Windows disk layout for UEFI devices.

{% hint style="info" %}
As of DeployR 1.1 this step also supports Legacy BIOS machines.
{% endhint %}

<figure><img src="/files/y3AZO72QmmxNBRq6JLdc" alt=""><figcaption></figcaption></figure>

DeployR specifies partition sizes slightly larger than the recommended values to avoid servicing and backup issues that can occur when the partitions are too small.  The default layout created by DeployR is:

* System partition.  A 499MB partition formatted as FAT32, containing the UEFI files necessary to boot the operating system.  (Note that larger sizes require additional free disk space to create a VSS snapshot, hence the 499MB default.)
* Microsoft Reserved partition.  A 128MB reserved partition, managed by the Windows operating system.
* Windows partition.  This NTFS-formatted partition holds the operating system, apps, data files, etc. for the Windows installation.  The size of this partition is determined by subtracting the sizes of the other partitions from the total size on the disk specified.
* Recovery partition.  This 1GB NTFS-formatted partition holds a Windows RE recovery image (winre.wim).

See the **Microsoft documentation** for more information. &#x20;


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