R5 storage upgrade

Is that an Area 51 or an Aurora R5?

If an Area 51 then this applies:

• Three 3.5-inch drive bays for SATA hard drives
• Two 2.5-inch drive bays for SATA solid-state drives or U.2
solid-state drives
• Max up to total five hard drives supported

If an Aurora then this:

Internally accessible
Solid-state drive (SSD) One M.2 SATA drive
NOTE: If you purchased an M.2 drive, it is assigned as primary drive
and all other SATA drives in your computer are assigned as
secondary drives.
U.2 drive One optional U.2 drive installed in 3.5-inch HDD bay.
One 3.5-inch drive bay For one 3.5-inch SATA drive or two 2.5-inch SATA drives (optional)
NOTE: If your computer is shipped with only one 3.5-inch SATA
drive, it is the primary drive. If your computer is shipped with two
2.5-inch SATA drives, one is primary drive and the other is
secondary drive.
Two 2.5-inch drive bays For two 2.5-inch SATA drives
NOTE: The SATA drives installed in these drive bays are secondary
drives.