The recovery partition would have been created by a windows installer.

Possibly you installed windows onto the 111.33GB X: partition once. Usually it puts the recovery partition after the install partition like on Disk 0 which is has your boot partition.

If Disk 4 was just (re)added then that recovery partiion is fair game to delete.

To consolidate X: Y: and the Disk 4 recovery, just right click on each one and select "Delete Volume". That would be the easiest way. You technically could delete Y: and Recovery and then extend X: (with extra tools) but the easiest way if it's empty is to just delete them all and create one new big one. If X: or Y: has files on it you need to keep, just move them off to one of your other devices temporarily. Once they're all deleted, just right click on the empty space to create a new volume.

The system reserved partiion is something to do with Windows and/or may be a factory install partition on a name brand computer like a Dell or somilar.