What is the actual write speed? It's described as 15x USB 2.0, but no specifics given which seems suspicious.

It says right in the description that it is USB 3.1. The 15x USB 2.0 refers to it being 15 times faster than USB 2.0. Absolute;y nothing suspicious about it. But note that while they are fast (especially the larger sizes) they aren't very durable. They break easily due to their ultra thin plastic shields around the USB connector that are made of metal in most other drives. I have several of them and rarely, if ever use them because they are so flimsy and unreliable.

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Sandisk 128GB Ultra Fit USB 3.1 Flash Drive, Speed Up to 130MB/s (SDCZ430-128G-G46)

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USB Specification: USB 3.2 Gen 1

USB 3.2 Gen 1
USB 3.1 Gen 1

Capacity: 128GB

128GB
256GB
512GB

A compact, plug-and-stay, high-speed USB 3.1 flash drive that's ideal for adding more storage to laptops, game consoles, in-car audio and more
Simple, fast way to add up to 256GB of storage to your device
Write up to 15X faster than standard USB 2.0 drives
Move a full-length movie to the drive in less than 30 seconds

Overview

Specs

Reviews (178)

SanDisk Ultra Fit USB 3.1 Flash Drive

Brand Name SanDisk
Product Part Number SDCZ430-128G-G46
Capacity 128 GB
Product Dimensions 1.2 x 0.6 x 0.2 inches

A compact, plug-and-stay, high-speed USB 3.1 flash drive that's ideal for adding more storage to laptops, game consoles, in-car audio and more.
Simple, fast way to add up to 128GB of storage to your device.
Read speeds up to 130MB/s.
Write up to 15X faster than standard USB 2.0 drives.
Move a full-length movie to the drive in less than 30 seconds.

with OEM USB Lanyard

Model
Brand	SanDisk
Series	Ultra Fit
Model	SDCZ430-128G-G46

Details
USB Specification	USB 3.2 Gen 1
USB Connectors	Type A
Color	Black
Capacity	128GB
Read Speed	up to 400MB/s
Security	128bit AES Encryption

Features
Features	* Compact plug-and-stay design to instantly add storage to your laptop, game console, in-car audio, and more * [ 128GB to 256GB ] Save time with ultra-fast transfer speeds up to 400MB/s. Transfer a full-length movie to the drive in less than 30 seconds * Get space for your high-resolution photos, videos, and music, plus documents and more at great value with up to 512GB of storage * Password-protected your files using a downloadable software * Recover accidentally deleted files with RescuePRO Deluxe software

Dimensions & Weight
Dimensions	0.20" x 0.56" x 1.17"
Weight	0.05 oz.

Additional Information
Date First Available	January 01, 2019

Warranty & Returns

Warranty, Returns, And Additional Information

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Sandisk 128GB Ultra Fit USB 3.1 Flash Drive, Speed Up to 130MB/s (SDCZ430-128G-G46)

Learn more about the SanDisk SDCZ430-128G-G46

Customer Reviews of the SanDisk SDCZ430-128G-G46

Warranty & Returns

Warranty, Returns, And Additional Information

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Item#: N82E16820173396

Sandisk 128GB Ultra Fit USB 3.1 Flash Drive, Speed Up to 130MB/s (SDCZ430-128G-G46)

Learn more about the SanDisk SDCZ430-128G-G46

Customer Reviews of the SanDisk SDCZ430-128G-G46

Warranty & Returns

Warranty, Returns, And Additional Information

Return Policies*

Manufacturer Contact Info