How to Use and Format ReFS on Windows 10 and Windows 2016/2019 Servers – Format with 64KB Size

ReFS is another file system introduced by Microsoft a few years back. It is better to know about it if you are working on the Windows server platform or even with the client versions like Windows 10 and 8.1. The file format is available in specific versions of Windows 10. As you are aware that NTFS (New Technology File System) was introduced almost 26 years ago, and we can say that it is no more a newer file system in the market. The ReFS (Resilient File System) has advantages and disadvantages in the production environment. In this guide, let us see how to use and format a disk partition in ReFS format (64 kilobytes) in Windows 10 and Windows 2019 server versions.

We will not be looking more on the advantages, disadvantages and tech specification of this file format. If you want to learn more, you can check this guide. According to me, ReFS is the best file format if you’re going to store the larger files which rarely get accessed. Especially if you save larger backup files on a disk, it is better to format in ReFS. This file system is most resilient against data corruption compared to NTFS. Though it is missing few features of NTFS such as file-level encryption and compression, as I said earlier, if you store larger files (like backup, media, data files) that don’t require encryption but need to be protected against data corruption. Microsoft and even other backup products such as Veeam recommend to use ReFS file format.

Remember a few key elements of ReFS before you format a disk.

  • You can’t install Operating System on the partition.
  • Windows App store can’t install apps on this partition.
  • Even the installed programs may not work/open perfectly.
  • No file-level compression and encryption (Full disk encryption and BitLocker still work)

As ReFS consumes more computer resources to work, it may impact the lower level servers and desktop computers. It may not be a significant issue in the data center with high end (right configuration) servers.

Windows Pro and Home Edition do not support ReFS file format. You will not get an option to format in ReFS as shown below. Also, few registry hacks suggested by other websites will not work if you have the wrong version of Windows 10, or 8.1.

Non Supporting Disks

How to Format a Disk in ReFS (Windows 10)

You should have Windows 10 Enterprise to get ReFS file format. Microsoft has slowly removed ReFS file format support from Windows 10 Pro by the latest Windows updates.

Right click on the partition you need to format and select format. Here choose the ReFS file format and unit size. You can leave the unit size to default if you do not have any specific size requirement. Few programs such as backup applications may require the disk in ReFS format with certain unit size like 64kb, in that case, select the option and format.

Select And Format In ReFS

You can confirm the file system by checking the properties.

Formatted Disk

If you want to format in command prompt or change the block size to a different one (in this case, 4K to 64K), follow the below steps.

Type the below command (Open the command prompt as administrator)

format K: /u /fs:refs /A:64k /i:enable

Convert Size

Here is the partition with 64K block size. Obviously, this conversion will format the entire disk which leads to data loss.

fsutil fsinfo refsinfo <drive letter:> is a useful command to get the details such as block size of a ReFS partition. It becomes hand when you have the Core version of Windows server or checking thorugh PowerShell.

64K Size

By the way, if you want to know about partition details from a command prompt, here is another useful command you must know as a server administrator.

fsutil fsinfo volumeinfo <drive letter:>

Output Of ReFS

Format ReFS from Storage Pool

You can get ReFS formatted disk pool from Storage Space in Windows 10. We are not covering it here since you need to have a minimum of two hard disks to create a storage pool which may not be applicable for personal Windows 10 computers.

Storage Pool

It is easy to create Storage Pool on the latest Windows system as long as you have more than 2 physical disks. You must not touch the OS disk. It should be done with the additional 2 more hard disks to create a storage pool. If you want to test it without having enough physical hard disks, you can create VHD (Virtual hard disk files) on your existing partition and see how it wokrs (as I created the last 10GB disk in above example)

Create Partitions in ReFS file format on Windows 2012R2, 2016 and 2019 Servers

The steps mentioned earlier for Windows 10 workstation suitable for server versions also.

You can format a disk in ReFS on Windows server versions easily without any registry hacks.

The CMD commands (mentioned under Windows 10 earlier) work well on the server OS in case you need to use them on Server Core or without desktop experience server versions.

Since Servers has more disks such as Physical disks, virtual disk files and NAS storage (iSCSI and Fiber disks), creating storage pool (space) in the server and formatting it with ReFS gives extra advantages of expanding the disk space whenever wanted in the pool.

Hope this guide gives the overview of the ReFS file system on Windows 10 and server versions 2012R2, 2016 and latest 2019. How to format the disks in ReFS by GUI and command prompt shown with examples.

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