1. Use DiskPart Utility
Go to command line and type diskpart.
Type this command to list all disks in computer:
If you want to check info about a disk (for example, disk 1), type these commands:
select disk 1
2. Run Disk Management Utility
Go to Start and type “Disk Management”. An option to open Disk Manager will appear.
Alternatively, type Windows + R and enter “diskmgmt.msc”
Each row corresponds to a different disk, as seen on diskpart utility.
Remember that you cannot merge partitions from different disks.