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Gray rectangular USB-C and USB-A dual-drive SSD, 85 by 20 by 8 mm, 100 g

MemoStone

MemoStone US4 512GB portable SSD 500MB/s

SKU CH-SX96-77JJM MPN US4-512

A dual USB-A and USB-C portable SSD with 512 GB capacity, up to 500 MB/s read and 480 MB/s write speeds, weighing 100 g

  • Total capacity512 GB
  • Sequential read speedUp to 500 MB/s
  • Sequential write speedUp to 480 MB/s
  • Interface typeUSB 3.1 Gen 2
  • Form factorType C & Type A
  • NAND flash type3D NAND

Capacity US4-512

  • 512 GB capacity stores large media libraries
  • USB 3.1 Gen 2 delivers up to 500 MBps read speed
  • Dual Type-C and Type-A connectors work with most devices
  • Compact 85.2 × 20.5 × 8.0 mm design weighs 100 g
  • 1 000 000 hour MTBF supports long-term reliability

Pocket-sized dual-connector SSD

The MemoStone US4 packs 512GB of 3D NAND storage into a 100g grey stick measuring 85.2 by 20.5 by 8.0mm. It exposes both a USB Type-C and a USB Type-A plug, so it works with laptops, desktops, tablets and phones without an adapter. Creative professionals and mobile workers who need fast, driver-free capacity between mixed USB-A and USB-C devices will find it a practical daily drive.

USB 3.1 Gen 2 interface, no extra power

The drive connects through a single USB 3.1 Gen 2 port and draws 2.15W while active, so it runs from the host bus without a separate power brick. Its dual-head design frees up the second port on the computer and removes the need to carry a dongle or hub when switching between Type-A and Type-C hosts. Plug-and-play operation means no software installation on any supported operating system.

Sustained 500/480 MB/s within 0–60 °C

Sequential transfers reach up to 500 MB/s read and 480 MB/s write across the rated operating range of -5 °C to +60 °C. The MTBF of 1,000,000 hours and an operating humidity tolerance of 5–95 % indicate stable throughput during long copy sessions rather than only in short bursts. Users who need sustained writes above 480 MB/s or capacities beyond 512GB should consider a desktop-class enclosure with active cooling.

How it compares

Measured against everything we stock in Portable USB SSDs, at today’s prices. Recalculated every night.

Price $59.99
Cheaper than about 90% of the 410 comparable items (median $202.99).
Total capacity 512 GB
Lower than about 90% of the 311 comparable items (median 1 TB).
Sequential read speed Up to 500 MB/s
Lower than about 88% of the 166 comparable items (median 1,050 MB/s).
Price per TB $117.17 per TB
Cheaper than about 65% of the 310 comparable items (median $142.00 per TB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameMemoStone
Product lineUS4
Model nameUS4-512
Part numberUS4-512
Total capacity512 GB
Product colorGray
Performance
Sequential read speedUp to 500 MB/s
Sequential write speedUp to 480 MB/s
Storage
NAND flash type3D NAND
Ports & slots
Interface typeUSB 3.1 Gen 2
Power
Active power draw2.15 W
Size & build
Form factorType C & Type A
Overall width85.2 mm
Product depth20.5 mm
Overall height8.0 mm
Product weight100g
Environment & compliance
Operating temperature range-5 °C to 60 °C
Storage temperature range-20 °C to 75 °C
Operating humidity range5-95%
More details
Mean time between failures1,000,000 h

Other versions of this model

3 more in the same range

Questions about this item

Does the 500 MBps sequential read speed drop once the drive heats up during long transfers?

The drive is rated for an operating temperature range of -5°C to 60°C, so sustained reads should remain within specification as long as the enclosure stays within that window.

How much power does the 512GB MemoStone US4 draw and how hot does it get when running all day?

Active power consumption is 2.15W and the operating temperature range is -5°C to 60°C, so the drive stays cool enough for continuous use without a fan.

Which ports or cables must my computer already have for the dual Type-C and Type-A connector to work?

Your host needs either a USB Type-C port or a standard USB Type-A port; the integrated 2-in-1 plug fits both without an extra adapter.

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