Read speed is claimed to be "up to 420 MB/s" and write speed "up to 380 MB/s. I assume that "MB/s" means "MegaBits/sec" and "up to" means that is a burst speed (i.e. it may be attained for a few seconds at the beginning of a transfer, but will fall back to a lower number for a sustained transfer). Does anyone have specs for *sustained* read and write speeds? Thanks!

It is meant to mean MiB/s (MegaBytes per second). I just ran a CrystalDiskMark test on mine, which has been heavily used and only has about 50GB of free space, and I get sustained sequential read and write speeds of 323MB/s and 277MB/s respectively. Obviously you'll probably never hit what they claim (other than burst speeds as you said) but it's still pretty dang fast.

Will this work on a Xbox One S?

Don't see any reason why not. You will have to format it for the xbox once you plug it in.

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SanDisk 256GB Extreme Pro USB 3.2 Gen 1 Solid State Flash Drive, Speed Up to 420MB/s (SDCZ880-256G-G46)

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Capacity: 256GB

128GB
256GB
512GB

Blazing-fast performance for super-speedy transfer of photos and 4K video
Work as fast as you need to with premium performance and huge capacities
Durable aluminum metal casing means less worry about everyday wear and tear
Help keep critical files safe with SanDisk SecureAccess encryption software
Recover accidentally deleted files with included RescuePROR Deluxe data recovery software offer (download required)
Work with flexibility thanks to USB 2.0 and 3.0 backward-compatibility

Overview

Specs

Reviews (44)

Model
Brand	SanDisk
Series	Extreme Pro
Model	SDCZ880-256G-G46

Details
USB Specification	USB 3.2 Gen 1
USB Connectors	Type A
Color	Black
Capacity	256GB
Read Speed	up to 420MB/s
Write Speed	up to 380MB/s
Security	128bit AES Encryption

Features
Features	READ/WRITE SPEEDS OF UP TO 420MB/s / 380MB/s1 Blazing-fast performance lets you transfer a full-length 4K movie to drive in less than 15 seconds2 or 1000 photos in less than 25 seconds3. 1 Read speeds up to 420MB/s, write speeds up to 380MB/s. USB 3.1 Gen 1 or USB 3.0 port required. Based on internal testing; performance may be lower depending upon host device. 1MB=1,000,000 bytes. 2 Based on 4K video transfer (4GB) with USB 3.1, Gen 1 or USB 3.0 host device. Results may vary based on host device, file attributes and other factors. 3 Based on 4GB transfer of 1000 photos (avg. file 4MB) with USB 3.1, Gen 1 or USB 3.0 host device. Results may vary based on host device, file attributes and other factors. SOLID STATE USB FLASH DRIVE The SanDisk Extreme PRO USB 3.1 Solid State Flash Drive delivers the performance, capacity, and reliability of an SSD in ultimate portability of a USB flash drive. ALUMINUM METAL CASING FOR DURABILITY The SanDisk Extreme PRO USB 3.1 Flash Drive features an elegant yet durable aluminum metal casing to help protect the drive from everyday wear and tear. SANDISK SECUREACCESS SOFTWARE PROTECTS YOUR PRIVACY4 Create a private folder on your drive with SanDisk SecureAccess software. This 128-bit AES encryption software makes it easy to password-protect critical files. Drag and drop files into the vault, and they'll be protected. 4 Password protection uses 128-bit AES encryption and is supported by Windows Vista, Windows 7, Windows 8, Windows 10 and Mac OS X v10.7+ (Software download required for Mac) EASY FILE RECOVERY WITH RESCUEPRO DELUXE SOFTWARE5 The drive comes with a RescuePRO Deluxe data recovery software download offer. This software makes it easy to recover files that have been accidentally deleted (download required). 5 Registration required; terms and conditions apply. COMPATIBLE WITH USB 3.0 AND 2.0 PORTS

Dimensions & Weight
Dimensions	0.45" x 0.84" x 2.79"

Additional Information
Date First Available	January 31, 2019

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SanDisk 256GB Extreme Pro USB 3.2 Gen 1 Solid State Flash Drive, Speed Up to 420MB/s (SDCZ880-256G-G46)

Learn more about the SanDisk SDCZ880-256G-G46

Customer Reviews of the SanDisk SDCZ880-256G-G46

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Item#: N82E16820173370

SanDisk 256GB Extreme Pro USB 3.2 Gen 1 Solid State Flash Drive, Speed Up to 420MB/s (SDCZ880-256G-G46)

Learn more about the SanDisk SDCZ880-256G-G46

Customer Reviews of the SanDisk SDCZ880-256G-G46

Warranty & Returns

Warranty, Returns, And Additional Information

Return Policies*

Manufacturer Contact Info