SSD Upgrade for HP ProBook 4320s 256GB/512GB/1TB/2TB | eBay
Amazon.com: 12.7mm SATA 2nd HDD SSD Hard Drive Optical Bay Caddy Frame Tray Bracket for HP Probook 4320S 4321S 4420S with Front Panel Bezel + Mounting Bracket : Electronics
HP Probook 4320s Disassembly - YouTube
How to install SSD in HP ProBook 4320s | Hard Drive replacement - YouTube