Customer reviews from SanDisk
SanDisk - 128GB Ultra Fit USB 3.1 Flash Drive, Speed Up to 130MB/s (SDCZ430-128G - G46
Average customer rating
3 out of 5
3
(13 Reviews)
Open Ratings Snapshot
Rating breakdown 13 reviews
5 Stars
3
4 Stars
3
3 Stars
2
2 Stars
1
1 Star
4
67%of customers recommend this product. 
(
2 out of 3
)
Best Buy Privacy Policy
Customer Reviews for SanDisk - 128GB Ultra Fit USB 3.1 Flash Drive, Speed Up to 130MB/s (SDCZ430-128G - G46
Customer Rating
1 out of 5
1
Not as speedy as advertised
on May 29, 2026
Posted by: Dunn
I think there is something wrong with the drive, but since it doesn't even appear in SanDisk's warranty registration, replacement is problematic. I'm getting 60 mb/sec file xfer speeds, even for large contiguous files.
Response from SanDiskBy SM OLS, June 1, 2026
We're sorry to hear about your experience. This drive features a USB-A form factor, a USB 3.2 Gen 1 interface, and up to 400 MB/s read speeds. Actual write speeds are lower and can vary depending on file type, file size and, host device performance. Please contact us at: https://support-en.sandisk.com/app/askweb so we can assist you further with troubleshooting and warranty-related questions.
Written by a customer while visiting SanDisk
Customer Rating
2 out of 5
2
Writing speed below average
on July 9, 2025
Posted by: Jo22
The writing speed is below average even if I compare it to a cheaper USB flash from Ali. I would have given 3 stars but since this information is hidden and not even displayed on the manufacturer's product page, it's a shame.
H2test
Test finished without errors.
You can now delete the test files *.h2w or verify them again.
Writing speed: 43.0 MByte/s
Reading speed: 278 MByte/s
H2testw v1.4
No, I would not recommend this to a friend.
Response from SanDiskBy SM OLS, July 9, 2025
Thank you for your feedback. We appreciate you sharing your test results and understand your concerns. While performance can vary based on system configuration and file type, your input helps us improve transparency. We'll make sure this is shared with the appropriate team for review. For further assistance and to help us look into this in more detail, please feel free to contact us at https://support-en.sandisk.com/app/askweb.
Written by a customer while visiting SanDisk
Customer Rating
5 out of 5
5
Perfect to plug and forget.
on June 21, 2024
Posted by: fenfen
Verified Purchase:Yes
The perfect plug in and forget device. I got it for a Wii U a friend gave me. The size allows it to be plugged in and not have to be taken back out when packing the unit. Would reccomend.
I would recommend this to a friend!
Written by a customer while visiting SanDisk
Customer Rating
3 out of 5
3
Fast and reliable.
on February 6, 2024
Posted by: Ehsanwah
I am IT Professional using these devices multiboot and much more. Its disadvantage is only little bit heated and plastic made. But it advantage is much more due to its speed and small size. It can't detected in any type of scanner or metal detector. I am using these about three years without any problem.
Highly recommended for IT Professional.
Response from SanDiskBy SM OLS, February 9, 2024
Hello,

I am Nelson from SanDisk® Global Support Team. Thank you for your valuable feedback. We really appreciate your time and efforts in posting this review. We will try to make your experience better in the future. If you require any assistance, you may submit a support ticket at https://support-en.wd.com/app/askweb. We would be more than happy to assist you.   

Thank you,
Nelson,
SanDisk® Support
Written by a customer while visiting SanDisk
Customer Rating
4 out of 5
4
Small but stealthy
on December 30, 2023
Posted by: Crankin
Verified Purchase:Yes
Speeds are decent but nothing special. The tiny size is nice however I recommend leaving this drive plugged into something at all times because it’s very easy to lose.
I would recommend this to a friend!
Written by a customer while visiting SanDisk
Customer Rating
1 out of 5
1
this usb is a shame
on February 5, 2023
Posted by: john segall
this usb is the worst in the history of usbs. its made of the cheapest plastic. it looks like a fake chinese usb you can buy on ali express. the older version was made of steel and looked really good. its sad to see what sandisk are doing from their famous brand.
Response from SanDiskBy SM OLS Team, February 17, 2023
Hello,

I am Will from SanDisk® Global Support Team. Thank you for taking your time out and posting a review for this USB Flash Drive. Please allow us to inform you that all of our products are manufactured on strong hardware platform to sustain daily usage. For other suggestions/ queries with any SanDisk® products, please feel free to contact SanDisk support directly and we would be glad to assist you.

Thank you,
Will,
SanDisk® Support.
Written by a customer while visiting SanDisk
Customer Rating
4 out of 5
4
the sandisk flash drive 128 gb
on January 1, 2023
Posted by: the os boy
so the flash drive is amaizing BUT its slightly slow.
wen you try to run like a os or transfer big files the lode times ar gona be long and painfull
Written by a customer while visiting SanDisk
Customer Rating
3 out of 5
3
Burned by PREVIOUS gen
on December 27, 2022
Posted by: leetoctopus
I bought the *previous version* of the Ultra Fit around 2016, and it started off pretty great - usually full USB 3.0 speeds for read, and a decent ~40 MB/s write. Not bad for the deal I got on the drive back then. Then, once I started putting more than 5GB of files on it (years later), its issues started showing up. Drive got very hot, and often ejected itself (Windows would do the unplug and replug sound). Move it to a USB 2.0 port, and the issues were gone, but you'd rarely beat 20MB/s writes. Now (of course after the warranty period), but after having written less than a terabyte or 2 on the drive, the drive is dying. With use on USB3 making errors and/or ejecting itself, I can only use it on USB2, but it now writes at ~6 MB/s, and I wouldn't be surprised if it makes a bunch of errors only if I had the patience to fill the whole drive. But I don't.
Great look, it was on my keychain for years and I didn't even loose the cap, but alas, the design is clearly heavily flawed, and these small drives just can't cool themselves fast enough. At least, not the SanDisk ones. I would have recommended it as a USB 2 drive, but even so, it seems like it can't even handle more than a dozen overwrites, which is woefully low for any flash tech (and this must have been TLC or better). That, or the heat killed it.
Response from SanDiskBy SM OLS Team, December 30, 2022
Hello,

I am Will from SanDisk® Global Support Team. We regret to learn about your experience and since you are facing issues while using this USB Drive, we suggest you to contact us directly so that we can investigate further to know more about the issue in order to isolate the possibilities and provide you with an appropriate resolution. SanDisk® stands behind its commitment to quality and warranty on its products. We will also check if your USB Drive is eligible for a possible replacement. Please contact SanDisk® Support at 1-866-SANDISK or submit a support request at www.sandisk.com/support and we will assist you towards the best possible resolution.

Thank you,
Will,
SanDisk® Support.
Written by a customer while visiting SanDisk
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