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SanDisk 256GB Ultra USB 3.0 Flash Drive - SDCZ48-256G-U46 Black

SanDisk 256GB Ultra USB 3.0 Flash Drive - SDCZ48-256G-U46 Black

Q: What is the real space available for the user? i Need at least 230GB free...

On mine, after reformatting to Apple's HFS+ journaled file system, I had 248,125,304,832 free bytes available. The raw capacity was 248,437,014,528 bytes.

Q: Anyone had this for 3-5 mos or longer and still happy with it? Still working well? Thanks in advance!

Works perfectly and fast. Nice even loading between 21MBPS & 31 MBPS. I t settles in evenly somewhere between these numbers and loads in almost the exact number all across the (in my case) music until they are are all loaded. In my case about 28MBPS. I use NTFS file format. Perhaps exFat may be a little faster of slower, I haven't tried it as It was fine and I didn't want to format the drive just to find out. I did a fast format at the start to leave the drive completely empty as I didn't need locked security. I am 'assuming' it works as advertised. Playback was flawless. Function fallowed fit which was just right from Rxer, to car, to PC. No sloppiness or 'collapsing' when inserting drive. I've found all Sandisk's to be well made, and most important, reliable, for years but this specific model has very little heat build up and 'all in all' is the best I've ever used so far. The exact opposite of a certain brand starting with a 'P' which runs hot and is guaranteed to eventually fail and the loss of about 5600 songs can be devastating. Getting the songs to run in the exact same order as recorded on the CD is a continuous problem and I haven't figured out yet to set that and all USB's seem to do it. I'm fairly sure there is a way but I haven't found the exact way to do this on any brand. Suggested solutions gratefully appreciated. Aside that, this is a winner and at $11.99 new, a very good deal. A year+ so far and no problems, Paul

Q: Does it read as a hard disk drive or removable storage when plugged in?

Removable storage. Unless you use it as a Windows To Go drive, when it would be read as a hard disk drive.

Product ID: 16083534

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Details

Brand
SanDisk
Memory Storage Capacity
256 GB
Hardware Interface
USB 3.0
Special Feature
Lightweight
Write Speed
40MB/s

⚡100 MB/s read speed

💼256GB high-capacity storage

🔒Password protection

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SanDisk 256GB Ultra USB 3.0 Flash Drive - SDCZ48-256G-U46 Black

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Description

🚀 Unlock speed and security on the go—because your data deserves the best!

SECURE YOUR DATA - Built-in password protection keeps your private files truly private
TRUSTED RELIABILITY - Backed by 25+ years of SanDisk quality and a 5-year warranty for peace of mind
SLEEK POCKET READY - Modern, minimalist design fits effortlessly into your professional lifestyle
MASSIVE 256 GB STORAGE - Carry your entire digital life—photos, videos, and work files—anywhere
BLAZING FAST TRANSFERS - USB 3.0 speeds up to 10x faster than USB 2.0 for instant file moves

The SanDisk 256GB Ultra USB 3.0 Flash Drive delivers ultra-fast 100 MB/s read speeds, enabling rapid transfer of large files like full-length movies in under a minute. Its generous 256GB capacity stores extensive data securely with password protection, all housed in a sleek, durable design. Trusted globally for over 25 years, this flash drive combines performance, portability, and peace of mind with a 5-year warranty.

Specifications

Read Speed	100
Connectivity Technology	USB
Color	black
Model Name	256GB Ultra Fit USB 3.0 Flash Drive 100MB/s
Flash Memory Type	USB flash drive
Manufacturer	Western Digital Technologies Inc.
Hardware Connectivity Technology	USB Type A
UPC	619659125974
Global Trade Identification Number	00619659125974, 07195003036446
RAM	256 GB
Item model number	SDCZ48-256G-U46
Item Weight	0.48 ounces
Product Dimensions	0.42 x 0.87 x 2.21 inches
Item Dimensions LxWxH	0.42 x 0.87 x 2.21 inches
Number of Processors	1
Flash Memory Size	256
Batteries	1 AAAA batteries required.
ASIN	B00YFI1A66
Is Discontinued By Manufacturer	No
Date First Available	May 30, 2015

Have a Question? See What Others Asked

What is the real space available for the user? i Need at least 230GB free...

Does this flash drive have a slider to retract the USB port into the casing?

Anyone had this for 3-5 mos or longer and still happy with it? Still working well? Thanks in advance!

Does it read as a hard disk drive or removable storage when plugged in?

Reviews

L**N

GOOD PRODUCT, GREAT BRAND!

Received timely, thanks. Started using couple days ago and it works great...good price as well for a well-known brand.

24.08.2025

J**G

Good drive

Reputable brand, good drive, good speeds. All rounder that works great 9/10 would have liked an emmc with faster transfers but I can't be too picky.

15.08.2025

C**N

San Disk Always my Go To

If I can, I get san disk for all my storage based needs, I will and have (with the exception of a few high speed M.2 SSDs) used two san disk ssds for years and the flash drive seems just as reliable. Fast speed, quick connection, and good storage for a reasonable price. Can't go wrong here.

18.06.2025

N**G

Great thumb drive

Showed as delivered but was not there. Had to have another sent. Other than that, great thumb drive.

26.08.2025

D**

worked great for updating bios and storing photos

worked perfectly for updating my new gaming PCs bios. very fast transfer speeds and connected right away. great design and it fit in tight spot. also the USB retracts to protect itself from getting damage. highly recommend

17.07.2025

C**.

Great product, great price

Very well priced item. Had to copy my entire documents folder to a new computer and I did it with this USB and it was lightning fast.

21.09.2025

A**A

No problems

Arrived safe

16.07.2025

L**Y

Nice!

Worked great to transfer drivers onto my new pc, plenty of storage with no issues. I can use it with my laptop or my PC which is great to be able to use it wherever I need!

20.09.2025

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