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Black curved USB flash drive with keyring loop

SanDisk

SanDisk Ultra Curve CZ550 128GB USB 3.2 Gen 1 Flash Drive Black

SKU CH-BZ0J-QT2H3

A 128GB USB 3.2 Gen 1 flash drive with read speeds up to 100MB/s, a built-in keyring loop, and a RescuePRO Deluxe recovery software offer

  • Total capacity128 GB
  • USB standardUSB 3.2 Gen 1
  • Max read speed100 MB/s
  • Write throughput100
  • Security featuresLightweight
  • Product colorBlack

Capacity 128GB

  • Fast transfers with 100 MB/s read speed
  • 128 GB capacity stores photos and videos
  • RescuePRO Deluxe software recovers deleted files
  • Built-in keyring loop keeps drive handy
  • Lightweight 3 g design fits in a pocket

Capacity and interface

The SanDisk Ultra Curve CZ550 is a 128GB USB 3.2 Gen 1 flash drive intended for everyday file transport and backup. Its read speed reaches 100MB/s so documents, photos and videos move quickly between devices. Buyers who need more storage than 128GB or who require sustained write performance for large media projects should consider higher-capacity or faster-tier drives.

Practical limits of USB 3.2 Gen 1

The drive uses the USB 3.2 Gen 1 interface which caps theoretical throughput at 5Gbps so real-world transfer rates will not exceed the quoted 100MB/s. Performance also depends on the host controller, cable quality and file mix; many small files will transfer more slowly than a single large file. No encryption or password protection is built in so sensitive data needs separate software security.

Build quality and keyring loop

The black plastic shell measures 4.5 L x 1.9 W x 0.77 H centimeters and weighs 3 grams making it light enough to stay on a keyring without noticeable bulk. A built-in keyring loop lets the drive attach to bags or keys reducing the chance of loss. The lightweight construction suits pocket carry but offers no ruggedisation against crushing or water exposure.

How it compares

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

Price $21.99
Cheaper than about 68% of the 1,099 comparable items (median $31.99).
Total capacity 128 GB
Higher than about 60% of the 746 comparable items (median 64 GB).
Price per TB $171.80 per TB
Cheaper than about 69% of the 600 comparable items (median $226.48 per TB).

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Specifications

Product
Brand nameSanDisk
Model nameSanDisk Ultra Curve USB 3.2 Flash Drive
Part numberSDCZ550-128G-G46
Total capacity128 GB
Product colorBlack
Performance
Max read speed100 MB/s
Write throughput100
Ports & slots
USB standardUSB 3.2 Gen 1
Size & build
Product dimensions4.5 L × 1.9 W × 0.77 H centimeters
Product weight3 g
More details
Security featuresLightweight

Other versions of this model

5 more in the same range

Questions about this item

Which capacity should I pick if I need space for photos and videos?

This model is the 128GB version; the range extends to 512GB so choose a larger capacity if you expect to store more media.

What does the 100 MB/s read speed mean when I copy files to my laptop?

You can expect up to 100 MB/s when reading large files on a USB 3.2 Gen 1 port; actual throughput varies with file size and system load.

Will the USB 3.2 Gen 1 interface limit performance on a newer USB-C port?

The drive uses USB 3.2 Gen 1, which runs at 5 Gbps; it will work on faster ports but cannot exceed its own 100 MB/s rating.

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