Check the Perform a quick format option.

Make sure the file system is set to NTFS, allocation unit size is set to default, and choose a volume label.

Leave the default drive letter assignment and click Next.

Select the additional disks, one by one, and click Add.

Right-click the unallocated space of the drive and select New Striped Volume (or New Spanned Volume).

Repeat steps 2 and 3 on the hard drives you want to combine.

Click Yes to confirm the deletion of the current volume and all its content.

Right-click the hard drive volume and select Delete volume.

Use the Windows key + X keyboard shortcut to open the Power User menu and select Disk Management.

It's important to note that you will erase the content of the hard drives participating of the Spanned or Striped volume, as such make sure to backup the data before proceeding. How to combine multiple hard drives into one large volume In this Windows 10 guide, we'll walk you through the steps creating one large volume combining multiple hard drives.

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