The T3 test unit was the 1TB variant of the Kingston KC2500. The Kingston KC2500 M.2 NVMe SSD comes in a simply card-backed plastic casing, which can be opened by simply tearing the cardboard.
2 NVMe connection. M2. SSDs tend to be faster than SATA SSDs, but on the whole, they are both much faster than hard drives. Here is a 1TB internal SATA SSD which can fit in 2.5-inch drive bays.