I'm using Windows 10 Pro upgraded from Windows 8.1 SL. I check Disk Management today and there are several partition I don't know about. 'This PC' shows only 2 partition C: and D: I know about these 2 partitions. When I Google about EFI System Partition all results are related to "How to delete EFI partition" but I want to know what these partition actually are for. There are 2 recovery partitions, which is also confusing. Also number given to these partition are not serially like you can see in screenshot under volume they are 1,2,3,7, Why like this? Each are also showing 100% free space. Can anyone please explain what other partitions are for? I don't need depth explanation just a little about all partition which can be easily understandable. Please anyone help this Novice. Thanks in advance.