You can add a 2.5" SSD and keep the drives you have now. Check to make sure you have the needed cables and adapter as pictured in this support site.
Table 1. Storage specifications
Interface
SATA 6 Gbps
Externally accessible
One 5.25-inch drive bay for DVD+/-RW drive, Blu-ray Disc combo (optional), or Blu-ray Disc writer (optional)
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.
JOcean
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November 22nd, 2019 12:00
You can add a 2.5" SSD and keep the drives you have now. Check to make sure you have the needed cables and adapter as pictured in this support site.
Table 1. Storage specifications
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.
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.
NOTE: : The SATA drives installed in these drive bays are secondary drives.