What storage improvements does the HP EliteDesk 800 G9 Mini have over the G1 version?

The HP EliteDesk 800 G9 Mini finally adds an M.2 2280 slot with PCIe Gen4 NVMe for a fast primary drive, while keeping a 2.5-inch SATA bay for a secondary drive (7mm thick only). It’s a solid small-form-factor layout — a welcome generational leap from the G1’s SATA-only limitation.