3 Storage Options in the Dell OptiPlex 3000 Micro

M.2 2230 and 2280 drives The NVMe slot accepts both M.2 2230 and 2280 form factors, so you can use a smaller drive if you have one.

One 2.5-inch SATA bay A single 2.5-inch SATA bay is included for a second drive. This is your only SATA option—Dell does not expose additional SATA ports externally.

No external SATA ports You cannot add more SATA drives externally, so plan your storage around the one internal bay and the M.2 slot.