How to merge two partitions of external hard disk on Windows 10/11?

To merge partitions of external hard drive, you'll want to use Windows' built-in Disk Management tool. Here's how to get there:

1. Right-click on the Start button or press Windows + X.Choose Disk Management from the menu.

2. To merge the partitions, you'll need to delete one of them:

• In Disk Management, find the partition you want to delete. Right-click on it.
  Select Delete Volume.
• Confirm that you want to delete it. (Remember, this will erase all data on that partition, so make sure it’s backed up!)
• You should now see unallocated space where the partition used to be.

3. Now it's time to merge the unallocated space with the remaining partition:

• Right-click on the partition that you want to extend.
• Select Extend Volume.
• Follow the prompts in the wizard. It’ll usually just ask you how much space you want to add (usually the default is the whole unallocated space).
• Hit finish. You've merged those partitions.

4. Once done, take a look in File Explorer. You should see the new size of your partition reflecting the merge.