Lexar SL500 4TB Hits 2,000MB/s Over USB 3.2 Gen 2x2, and Most Laptops Cannot Use It Fully

What it is

The Lexar SL500 is a compact USB 3.2 Gen 2x2 portable SSD with magnetic attachment support for iPhone 15 and 16 Pro series (via MagSafe-compatible case mounting). The 4TB capacity is the top-of-line SKU; smaller options are 1TB and 2TB. The drive measures 85 x 54 x 4.8mm, weighs roughly 42g, and includes Lexar's DataShield 256-bit AES encryption software. It is IP54-rated for dust and water resistance and drop-tested to 2 meters. Peak performance is 2,000MB/s read and 1,800MB/s write.

Pricing: $280 at B&H and Amazon for 4TB; 2TB around $160; 1TB around $90.

What's interesting

2,000MB/s sustained read over USB 3.2 Gen 2x2 is competitive with Samsung T9 and SanDisk Extreme Pro v2 at comparable price tiers. StorageReview measured real-world sequential reads at 1,780MB/s and writes at 1,634MB/s, confirming the spec under sustained load.

MagSafe-compatible attachment via case mounting is a differentiator for iPhone 15 and 16 Pro video shooters. ProRes external recording to MagSafe-attached drives is now a common iPhone workflow, and the SL500's slim 4.8mm profile fits the use case well. Digital Camera World confirmed the magnetic attachment is strong enough for handheld iPhone shooting.

The 4.8mm form factor is genuinely thin. Most portable SSDs ship at 8-12mm thick; the SL500 at half that dimension fits in tight pockets and slots alongside phones and tablets.

IP54 and 2-meter drop protection are pragmatic additions. Samsung T9 is IP65-rated (higher water resistance); the Lexar is IP54 which is fine for rain and desktop spills but not submersion. The 2-meter drop test matches Samsung T9.

DataShield 256-bit AES encryption software is included. For users carrying client files, the encryption is genuine even if the implementation is software rather than hardware.

At $280 for 4TB, the price-per-terabyte ($70) undercuts Samsung T9 and SanDisk Extreme Pro v2 at the same capacity.

What's missing or unverified

USB 3.2 Gen 2x2 is not widely supported by host devices. Most Thunderbolt 3/4 Macs, most standard USB-C laptops, and most desktops use USB 3.2 Gen 2 (10Gbps) which caps transfers at roughly 1,000MB/s, not the 2,000MB/s the SL500 is capable of. Tom's Hardware specifically called out that buyers should verify their laptop actually has USB 3.2 Gen 2x2 before paying for the higher-speed SKU.

No hardware encryption. The DataShield AES is software-only, which means encrypted files are slower to read than non-encrypted files. Samsung T7 Shield offers optional hardware encryption.

Thermal throttling under sustained write loads is typical for thin-form-factor SSDs. TechRadar measured a 15-20% speed drop after roughly 200GB of sustained sequential write, dropping to roughly 1,400MB/s. For most consumer use this is invisible; for commercial video ingestion, the slowdown is measurable.

USB-C cable is included; the drive uses a fixed USB-C port. No USB-A adapter ships in the box.

Warranty is 3 years. Samsung T9 is 5 years; SanDisk Extreme Pro v2 is 5 years. The shorter warranty is a real difference.

Who it's for

iPhone 15 and 16 Pro videographers recording ProRes to external storage. Content creators editing 4K video in Premiere Pro, DaVinci Resolve, or Final Cut who need fast portable scratch storage. Gamers carrying PS5 and Xbox Series X game libraries between locations. Anyone with a USB 3.2 Gen 2x2 laptop (some MacBook Pro M4 and Windows AI Copilot+ laptops support it).

Not for: users on Thunderbolt-only ports (get a Thunderbolt 3 SSD like OWC Envoy Pro FX for 2,800MB/s over TB3), Chromebook users (USB 3.2 Gen 2x2 support is spotty), or budget buyers happy with a slower 1,000MB/s drive at lower price.

Verdict

The Lexar SL500 at $280 for 4TB is the best-value USB 3.2 Gen 2x2 portable SSD in 2026. Speed, form factor, and price together beat Samsung T9 and SanDisk Extreme Pro v2 at the same capacity. Against the Samsung T9 4TB and SanDisk Extreme Pro v2 4TB, the Lexar wins on price and slimness; it loses on warranty length. For most buyers with compatible hardware, this is the right pick.