5 Things to Know About ASUS PN51 Storage
Two-drive layout The PN51 keeps the same storage setup as the PN50: one M.2 2280 PCIe 3.0 x4 slot and one 2.5-inch SATA III bay.
No external SATA ports ASUS did not add external SATA ports on this generation, so you are limited to the two internal drives.
One fast, one flexible The M.2 slot supports fast PCIe 3.0 x4 SSDs, while the 2.5-inch bay accepts traditional SATA drives for larger, cheaper storage.
No expansion beyond two drives You cannot add more internal storage without replacing existing drives.
Upgrade both drives You can upgrade both the M.2 and 2.5-inch drives independently for more capacity or speed.