I see the usual 2 partitions from Windows, and a recovery partition. Usually, such are put there by the maker. Ask them. But why care about half a gigabyte?
Why do you go into Disk Management to defrag? It’s not the disk, that is defragged, but a partition. And there is no need at all to defrag those two small partitions, that you don’t see in File Manager. Defragging the c:-drive is done from within Windows, and doesn’t need Disk Management.
And, as Bob said, there is no need to defrag (a partition on) an SSD. Windows is smart enough to hardly do anything if you try. We have to believe it’s an SSD indeed, not a HDD, although 1 GB is rather large for an SSD. If it happens to be a HDD (we can’t see it, you can) it’s safe to defrag,
Recently I have been receiving a lot of questions about a third partition that is not visible when trying to defrag a hard drive with the native Windows defrag utility. People claim it is used by Microsoft for system logging or similar purposes, but no one seems to know anything about this mysterious partition on their own laptop or desktop!
After some research, I found out that these partitions are created by Intel Rapid Storage Technology (IRST), formerly known as Intel Matrix Storage Manager, and the documentation on the official websites is rather scarce.
The first thing we need to look at is what IRST/IMSM actually does. It used to be an internal software package for storage management but was later released as a public driver under different names such as “Intel(R) Matrix Storage Manager”, “Rapid Storage Technology” and now just plain “Intel Rapid Storage Technology”. The old name obviously refers to its main function which is to provide RAID (Redundant Array of Independent Disks) capabilities to end-users.