D drive is usually the backup partition on MS Windows.....
That machine has Win 10 Pro on it.
On most of my machines, “D” is a DVD drive or a 2nd SSD or HD.
Recovery partions are on one drive or another but not separately lettered. (On the machine I’m on now, the recovery partition is on “G”, which physical SSD was the original boot drive, but is now a backup & data drive. There actually is still an old copy of the OS, also Win 10 Pro, on “G”.
The N22 does not have an internal DVD drive. The recovery partition is on the boot SSD, but, again, has no separate letter.