This Machine Supports Single and Dual Drive Configurations. (Two 2.5" Solid State Drives or Hard Drives) Note: If replacing the 2.5" Hard Drive for a 2.5" Solid State Drive, remove the hard drive bracket and connector from the hard drive and install it on the solid state drive. If installing a Second 2.5" Solid State Drive or Hard Drive, you will need the 2.5" Drive hardware kit p/n 483862-001 (Includes: Left and Right Brackets, Mylar Sleeve, Interposer Connector, 4 Isolators and Screws) for installation.