M.2 SATA drives, which is standard for SATA-based M.2 modules. HP Support Community Storage Capacity Limits Official Support: HP's original documentation lists support for up to a Real-world Support:
Will not fit because there is no mounting screw hole at the 80mm mark. hp probook 450 g2 m.2 ssd compatibility
and community reports from HP Support Forums have confirmed that modern 256GB and 512GB M.2 SATA 2242 drives work perfectly fine. 4. Dual Drive Configuration to secure the drive, which is often not
The slot accepts only M.2 2242 drives (42mm in length). Common 2280 (80mm) drives are too long and cannot be installed. to secure the drive
to secure the drive, which is often not included with the laptop if it was originally shipped without an SSD. Comparison of Storage Options HP Probook 450 g2 m2 - Tom's Hardware Forum