To merge hard drive partitions, you can use a partition nagement tool such as Disk Management in Windows or Disk Utility in cOS. Here are the general steps to merge partitions:

1. Back up any important data on the partitions you plan to merge.
2. Open the partition nagement tool on your operating system.
3. Locate the partitions you want to merge and ke sure they are adjacent to each other.
4. Right-click on one of the partitions and select the option to delete it. This will remove the partition and its data.
5. Right-click on the other partition and select the option to extend or merge it with the unallocated space created from the deleted partition.
6. Follow the on-screen instructions to complete the merging process.

Remember to be cautious when merging partitions, as it involves deleting data and resizing partitions, which can result in data loss if not done correctly.