What portable SSD speeds actually mean for your workflow
Portable SSD specifications list sequential read/write speeds over USB — the most favorable metric. Real-world sustained performance depends on workload type, thermal conditions, and cable quality. Here's what the numbers mean in practice. USB 3.2 Gen 2 (10 Gbps bus): Theoretical maximum 1,250 MB/s. Most Gen 2 portable SSDs achieve 900–1,100 MB/s in practice. This speed supports: real-time editing of 4K H.264/HEVC footage (bitrates up to 400 Mbps), working directly from the drive in Lightroom or Capture One on RAW photo libraries, and transferring a 100GB video project in under 2 minutes. USB 3.2 Gen 2×2 (20 Gbps bus): Theoretical maximum 2,500 MB/s. Real-world 1,800–2,100 MB/s on top drives like the Samsung T9. Required for 8K RAW workflows, DaVinci Resolve with multiple streams of BRAW, or situations where you're constantly reading/writing large files to the drive simultaneously. This speed requires both the drive and host port to support Gen 2×2 — check your laptop or dock specs. For most photographers and 1080p/4K videographers, Gen 2 at 1,050 MB/s is completely sufficient. The jump to Gen 2×2 at 2,000 MB/s is only worth the extra cost for professional 8K or multi-camera workflows.
Best value under $100: SanDisk Extreme 1TB (~$70–85)
The SanDisk Extreme is the most popular portable SSD in its price tier for good reason. USB 3.2 Gen 2, 1,050 MB/s read and 1,000 MB/s write, IP55 water and dust resistance, and a rubberized body that survives everyday carry. SanDisk (a Western Digital brand) uses their own TLC NAND with a Silicon Motion controller — a combination with a strong real-world reliability track record across millions of units. The Extreme is bus-powered via a single USB-C cable (USB-A adapter included) with no additional power needed. It fits in a shirt pocket at 48 grams. The 1TB model typically runs $70–85, which makes it the cheapest path to 1,050 MB/s portable storage. One caveat: sustained writes beyond the drive's SLC cache (~80GB) throttle to around 300–500 MB/s due to thermal limits in the compact enclosure. For most workflows where you're writing a project and then reading from it, this doesn't appear. For sequential ingest of 100GB+ of video footage in a single continuous copy, the Samsung T7 or T9 handles heat better.
Best all-rounder: Samsung T7 1TB (~$90–110)
The Samsung T7 is the benchmark portable SSD for professionals who want reliability above all else. Aluminum enclosure with passive heat dissipation (no fan, but better thermal management than plastic drives), 1,050 MB/s read and 1,000 MB/s write via USB 3.2 Gen 2, and optional AES-256 hardware encryption with fingerprint unlocking on the T7 Shield variant. The T7 uses Samsung's V-NAND TLC and in-house controller — the same architecture behind the 870 EVO and 990 Pro. It sustains 1,000 MB/s for longer writes than most competing drives before thermal throttling, making it the right choice for shooting tethered or ingest workflows where you transfer 200GB+ in a single session. Weighs 58 grams. Available in 500GB, 1TB, and 2TB. For a photographer or videographer who relies on the drive daily and can't afford a failure during a job, the T7's reliability reputation and Samsung's 3-year warranty make it worth the $15–25 premium over the SanDisk Extreme.
Best for 2TB and heavy workloads: Samsung T9 2TB (~$170–190)
The Samsung T9 is the top option for users who need 2TB capacity and maximum sustained throughput. USB 3.2 Gen 2×2, rated at 2,000 MB/s read and 1,950 MB/s write — nearly double the Gen 2 drives — with Samsung's V-NAND TLC and a robust thermal design that sustains high speeds under continuous load. To achieve the rated 2,000 MB/s speeds, your host device must support USB 3.2 Gen 2×2. Most 2023–2026 desktop motherboards have a Gen 2×2 port; many laptops do not (check spec sheets for '20Gbps USB-C'). On a Gen 2 port, the T9 still runs at 1,000+ MB/s — same as the T7, but at higher capacity. The T9 2TB costs $170–190 in 2026, which works out to $0.09/GB — similar to the T7 1TB at $0.10/GB. If you're choosing between the T7 1TB and T9 2TB at roughly equivalent per-GB cost, the T9 wins outright on capacity and provides a real speed advantage for Gen 2×2 systems. For heavy 8K video work, multi-camera ingest, or daily professional use, the T9 is the right answer under $200.