External SSD

Overview

A portable external SSD is a solid-state drive packaged for travel: an internal NVMe module bridged to a USB-C port inside a pocket-sized aluminium shell. With no moving parts it tolerates drops that would kill a spinning disk, and the USB 3.2 Gen 2 link sustains roughly a gigabyte per second, fast enough to edit large media files directly off the drive.

The product is assembled inside a two-piece Enclosure Assembly machined from aluminium so the case itself draws heat away from the electronics. Inside sit the Internal SSD PCB and the USB Bridge Board, coupled to the housing through the Thermal Stack. An Status LED reports activity, and an in-box USB-C to C Cable connects it to a host.

How it works

The internal SSD board carries the SSD Controller IC, the NAND, and a DRAM cache. The controller writes data into the NAND Flash Package packages, each holding 3D TLC cells stacked in vertical layers. Because flash cannot overwrite in place, the controller maintains a flash translation table in the DRAM Cache that maps logical block addresses to physical pages, and performs wear-leveling and ECC to extend endurance and correct bit errors.

The host speaks USB, not NVMe, so the USB-to-NVMe Bridge Controller translates USB 3.2 Gen 2 packets into PCIe/NVMe commands for the internal drive. The bridge enumerates the device as USB mass storage so any computer mounts it without drivers. Sustained transfers heat the controller and NAND; the Thermal Pad and graphene film conduct that heat into the aluminium housing, which radiates it away to hold performance during long writes.