Does this design fit well on a key chain? Is it durable enough for a key chain?

Yes it is. This flash drive has some weight to it and is pretty durable and sturdy.

What is the continuous read speed on this Samsung 3.1 flash drive for large reads (20GB to 50Gb of 1GB files)? My current SanDisk throttles at 80MB near the middle to end of such batches.

I don't have precise numbers with which to answer your question. I use it to back up My Documents file once a week. I haven't read large files from it except when I delete the oldest file before copying the current file to it. This is a duplicate backup because I save each document I change or create to a USB 2 drive at the time. My documents consists of 6.07 GB consisting of 11,462 files and 1,843 folders. It deletes that in about 5 minutes. There are quite a few photos in that mix. It takes about 10 minutes to copy from my hard drive to the flash drive. I doubt if this will help you. It has a reputation for being very slow when writing to it and I realize it is a slow writer but it satisfies me. It get slower as it progresses to the end of the file.

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SAMSUNG 128GB BAR Plus (Metal) USB 3.1 Flash Drive, Speed Up to 400MB/s (MUF-128BE3/AM)

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Color: Silver

Capacity: 128GB

64GB
128GB
256GB

Reliable and secure storage for your photos, videos, music, and files
Rugged metal casing for durability with key ring to prevent loss
Safeguard your data (Water proof, shock proof, magnet proof, temperature proof, x-ray proof)
USB 3.1 flash drive with backwards compatibility (USB 3.0, USB 2.0)

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Model
Brand	SAMSUNG
Series	BAR Plus
Model	MUF-128BE3/AM

Details
USB Specification	USB 3.1 Gen 1
Color	Champagne Silver
Capacity	128GB
Read Speed	up to 400MB/s
Write Speed	up to 100MB/s

Features
Features	Speed in Style A modern take on a classic. The next generation Bar Plus elevates the flash drive to an everyday essential, offering impressive speeds in a striking design. Fits in your hand, a pure minimalism that cleverly blends style, speed, and reliability. Move Files in a Flash Get your time back. Fast and convenient read speeds up to 400MB/s with the latest USB 3.1 standard gives you more time to work, play, watch, and create. Send a 3GB 4K UHD video file from your Bar Plus to your PC in just 10 seconds. Rugged Refinement As rugged as it is stylish. The sturdy metal body keeps your data safe and intact, and the integrated key ring prevents accidental misplacement or loss. The Bar Plus is the ideal combination of stunning design and worry-free durability. Tough & Trusted Files stay secure, anywhere you go. Samsung's leadership in flash memory makes the Bar Plus a trustworthy drive to store your valuable data. It works through it all with a waterproof, shock-proof, temperature-proof, magnet-proof, and X-ray-proof body.

Dimensions & Weight
Dimensions	0.50" x 0.60" x 1.60"
Weight	0.04 oz.

Additional Information
First Listed on Newegg	July 18, 2025

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SAMSUNG 128GB BAR Plus (Metal) USB 3.1 Flash Drive, Speed Up to 400MB/s (MUF-128BE3/AM)

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Item#: 9SIA47JKHS8262

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SAMSUNG 128GB BAR Plus (Metal) USB 3.1 Flash Drive, Speed Up to 400MB/s (MUF-128BE3/AM)

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