3 Things to Know About the M720q's Storage Limits
One M.2 slot only The M720q has a single M.2 slot, so you can install only one NVMe SSD. There is no second M.2 slot for additional drives.
One SATA port available A single SATA port lets you add a 2.5-inch drive alongside the NVMe SSD. This gives you two drives total.
No expansion beyond that The M720q cannot support more than one NVMe and one SATA drive. Do not expect to add extra M.2 storage.