4 Things to Know About the Asustor AS6604T's NVMe Slots

The two M.2 slots are for caching only, not storage. They cannot be used as primary storage drives.

The four main SATA bays support both 3.5-inch HDDs and 2.5-inch SSDs. This gives you flexible traditional storage options.

If you need NVMe for actual storage, skip this model. The AS5404T is the better choice for that purpose.

This caching-only approach is the same as the 2-bay version. It limits performance benefits to read/write acceleration.