
This guide will walk you through the steps to create one large volume combining multiple hard drives in Windows 10.
How to combine multiple hard drives into one large volume
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.- Use the Windows key + X keyboard shortcut to open the Power User menu and select Disk Management.
- Right-click the hard drive volume and select Delete volume.

- Click Yes to confirm the deletion of the current volume and all its content.
- Repeat steps 2 and 3 on the hard drives you want to combine.
- Right-click the unallocated space of the drive and select New Striped Volume (or New Spanned Volume).
- Click Next.

- Select the additional disks, one by one, and click Add.
- Click Next.

- Leave the default drive letter assignment and click Next.
- Make sure the file system is set to NTFS, allocation unit size is set to default, and choose a volume label.
- Check the Perform a quick format option.
- Click Next.

- Click Finish.

- You'll be prompted to convert the hard drive from basic to dynamic, click Yes to complete the task.

Another difference between these two solutions is that you can easily add more hard drives to your computer to extend a Spanned volume, something that is not supported on Striped volumes.
You should note to users that when they use Striped Volume (RAID 0), in case of a hard disk drive failure they lose all their data in both drives. In the case of the Spanned Volume (JBOD) you most probably lose the data from the failed drive and data from the other drive should be accessible using special tools. Also in Striped Volume they should see an performance increase (almost twice the IOPS they see in a single drive)
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