We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Silver metal dual USB-C and USB-A flash drive with rotating cover

SanDisk

SanDisk SDDDC4 256GB USB 3.1 Type-C/Type-A Dual-Port USB Flash Drive

SKU CH-ACEQ-3ZC3A MPN SDDDC4

A 256 GB dual-port flash drive with USB Type-C and Type-A connectors, up to 150 MB/s read speed, and a rotatable metal shell

  • Total capacity256 GB

Capacity 256GB

  • Dual USB-C and USB-A ports let you move files between phones, tablets and computers
  • Up to 150MB/s read speed transfers large photos and videos quickly
  • 256GB capacity frees space on your mobile device for more apps and media
  • SanDisk Memory Zone app backs up contacts, photos and documents automatically
  • Rotatable metal shell protects both connectors and includes a keyring loop

256 GB dual-port USB flash drive

The SanDisk SDDDC4 provides 256 GB of storage in a metal-cased drive with both USB Type-C and Type-A connectors. It lets users move files directly between USB-C smartphones, tablets, Macs and USB-A computers without adapters. The rotatable design protects both ports when the drive is carried on a keyring.

Sustained transfer behaviour

The drive is rated for up to 150 MB/s read speed under the USB 3.1 Gen 1 interface. Actual throughput will vary with file size, host controller performance and thermal conditions during extended copies. No write-speed figure is published, so sustained write performance cannot be characterised from the supplied data.

USB 3.1 Gen 1 practical limits

The USB 3.1 Gen 1 interface caps theoretical bandwidth at 5 Gbps, so real-world speeds remain well below the 150 MB/s headline figure when multiple devices share the bus. The drive operates within a 0–35 °C temperature range, and performance may throttle if the metal enclosure exceeds that limit during prolonged use.

How it compares

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

Price $46.99
Pricier than about 62% of the 1,099 comparable items (median $31.99).
Total capacity 256 GB
Higher than about 80% of the 746 comparable items (median 64 GB).
Price per TB $183.55 per TB
Cheaper than about 65% of the 600 comparable items (median $226.48 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
Total capacity256 GB

Other versions of this model

5 more in the same range

Questions about this item

Does the 150MB/s read speed generate noticeable heat during long transfers?

The metal shell helps dissipate warmth, and the drive is rated for 0–35 °C operating temperature, so it stays within safe limits during extended use.

What devices must I already own to use both the Type-C and Type-A connectors?

You need a USB Type-C port (smartphone, tablet, or Mac) and a USB Type-A port (PC or laptop) to take full advantage of the dual-port design.

Will the USB 3.1 Gen 1 Type-C interface work with my older USB 2.0 Type-A ports?

Yes, the drive is backward-compatible with USB 2.0 Type-A ports, though transfer speeds will fall to the older port's maximum.

More in USB Thumb Drives

Similar items