固态硬盘、移动硬盘、硬盘盒与 NAS

内置固态硬盘

The sensible alternative to the 990 PRO for enclosure use. Both are PCIe Gen4 TLC drives quoting around 7,400 MB/s internally, and behind a USB4 bridge that difference disappears entirely. The gap that survives is warranty and endurance, so compare those rather than the headline speed. Not tested here yet.

硬盘盒

Enclosure only, 40Gb/s USB4, in a solid aluminium body that is the heat sink. That last part is the reason to care: an NVMe drive in a small sealed box throttles under sustained writes, and sustained writes are exactly what an agent fleet produces overnight. Not tested here yet.

内置固态硬盘

A fast PCIe 4.0 drive to put inside an enclosure. Worth knowing before you pay for the speed: the 7,450 MB/s on the box is what it does on an internal slot, and a USB4 enclosure caps well below that. Buy this for endurance and reliability, not for a number you will never see externally. Not tested here yet.

移动固态硬盘

A finished drive rather than a drive and a box: nothing to assemble, nothing to get wrong. The price is the interface. USB 3.2 Gen 2x2 tops out near 2,000 MB/s against USB4's 40Gb/s, and Macs have historically been awkward with Gen 2x2. For a machine that mostly needs somewhere to put things, that ceiling rarely matters. Not tested here yet.

硬盘盒

40Gbps USB4, takes a 2230 to 2280 drive up to 8TB, and is built to sit under a Mac mini. The reason to own one is arithmetic: Apple charges a large premium per storage tier and the internal drive cannot be changed later. Not tested here yet.