The official HP documentation recommends a maximum capacity of for the M.2 SSD. Many HP community posts state that 250 GB is not supported or “not recommended”. This conservative recommendation likely stems from the fact that 2242‑size drives were scarce in larger capacities when the laptop was new, and HP only validated the M.2 slot with 120 GB/128 GB drives.
The HP ProBook 450 G2 is a capable machine that can still handle modern office tasks, but its M.2 slot is a relic of a transitional era.
A Tom’s Hardware contributor summarised it well: “sata3 m2 should have the same performance as 2.5" sata3 drives” . The main advantage is the small form factor: you can add an extra SSD without removing your existing storage, keeping your large HDD for media and files while the OS and applications enjoy SSD speed. hp probook 450 g2 m2 ssd compatibility
The more common 2280 (80mm) drives used in newer laptops are physically too long to fit into the designated space and cannot be secured with the mounting screw. Keying: B+M Key
While 128GB was common in early docs, 256GB or 512GB M.2 2242 SATA drives often work. Step-by-Step: Installing an SSD in ProBook 450 G2 Upgrading the ProBook 450 G2 is straightforward. The official HP documentation recommends a maximum capacity
If you attempt to install a modern NVMe M.2 drive, the laptop will not recognize it because the motherboard lacks the necessary PCIe lanes wired to that specific slot. Physical Form Factor: 2242
However, the ProBook 450 G2 has a specific quirk regarding storage upgrades—specifically the mysterious M.2 slot. Many users buy an M.2 SSD only to find it doesn’t fit or isn’t recognized. The HP ProBook 450 G2 is a capable
If you buy a modern NVMe M.2 SSD (which usually comes in the longer 2280 size), it will physically not fit, and the motherboard will not recognize it. You must specifically purchase an . 2. Technical Specifications Matrix Specification Slot Type M.2 NGFF (Next Generation Form Factor) Located internally near the battery/Wi-Fi card. Supported Protocol SATA III (6 Gbps) Limited to SATA speeds (~500-550 MB/s). Physical Size 2280 and 2260 sizes are not supported. Max Tested Capacity 512 GB - 1 TB Dependent on operating system and partition style (GPT). Primary Use Case OS Boot Drive or Cache Best used to store Windows and essential apps. 3. Dual-Storage Configuration Options
, as the BIOS generally recognizes larger SATA-based M.2 drives. HP Support Community Why M.2 SATA vs. NVMe Matters