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Extended holiday returns
FREE refund/replacement until Jan 31, 2027 Learn more
FREE refund/replacement until Jan 31, 2027 Learn more
This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2027
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
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Availability:
In Stock.
Arrives
Monday, Nov 16
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At a glance
- Condition
- New
- Style
- Up to 400MB/s
- Size
- 512GB
- Model
- SDCZ430-512G- GAM46
- Storage
- 512 GB
- Dimensions
- 1.17"D x 0.56"W x 0.2"H
- Weight
- 0.01 kg
- Warranty
- 5- year limited manufacturer warranty
- Works with
- Laptop
Features 5
- Compact plug-and-stay design to instantly add storage to your laptop, game console, in-car audio, and more
- Save time with ultra-fast transfer speeds up to 400MB/s (Based on read speed. 1 MB/s = 1 million bytes per second. Based on internal testing; performance may vary depending upon host device, usage conditions, drive capacity, and other factors. USB 3.0 port required.)
- Transfer a full-length movie to the drive in less than 30 seconds (Based on 1.2GB MPEG-4 video transfer with USB 3.2 Gen 1 or USB 3.0 host device.)
- Get space for your high-resolution photos, videos, and more at a great value with up to 512GB of storage (1GB=1,000,000,000 bytes. Actual user storage less.)
- Password-protect files using a downloadable software (Password protection uses 128-bit AES encryption and is supported by Windows 10+ and macOS v10.9+ (Software download required, see Password Protection page on SanDisk site).)
Description
The SanDisk Ultra Fit USB 3.2 Gen 1 Flash Drive has an ultra-compact design so you can plug and forget, making it easy to add extra storage. Spend less time waiting and more time doing with fast transfer speeds up to 400MB/s. This fast flash drive adds up to 512GB of storage for your content.(Based on read speed. 1 MB/s = 1 million bytes per second. Based on internal testing; performance may vary depending upon host device, usage conditions, drive capacity, and other factors. USB 3.0 port required. 1GB=1,000,000,000 bytes. Actual user storage less.)
Specs 22
| Brand | SANDISK |
|---|---|
| Memory Storage Capacity | 512 GB |
| Hardware Interface | USB 3.2 Gen 1 |
| Special Feature | Compact |
| Write Speed | 60MB/s |
| Additional Features | Compact |
| Read Speed | 400 MB/s |
| Connectivity Technology | USB |
| Flash Memory Type | USB |
| Hardware Connectivity Technology | USB Type A |
| Color | Black |
| Item Dimensions D x W x H | 1.17"D x 0.56"W x 0.2"H |
| Model Name | SanDisk Ultra Fit USB 3.2 Gen 1 Flash Drive |
| Item Highlight | USB Flash Drive, For Laptops, Tablets, TV's, Gaming Consoles, Plug-and-Stay Design, 128-bit AES Encryption, USB 3.2 Gen 1 |
| Manufacturer | Sandisk Technologies, Inc. |
| Unit Count | 1 Count |
| Number of Items | 1 |
| UPC | 619659198374 |
| Number of Packs | 1 |
| Item Weight | 0.01 kg |
| Model Number | SDCZ430-512G- GAM46 |
| Mfr Part Number | SDCZ430-512G-GAM46 |
No specs match.
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Monday, Nov 16
Yes, absolutely! This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2027.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Incredibly Tiny, Deceptively Fast - My Go-To Drive for Large Files
Style: Up to 400MB/s
Size: 512GB
I needed a high-capacity flash drive that I could leave plugged into my laptop without it sticking out and risking being snapped off. The SanDisk Ultra Fit is famous for its tiny, low-profile design, and this 512GB model was the perfect "plug-and-forget" solution I was looking for. Real-World Speed & Performance For a drive this small, the performance is impressive. While it's not going to match an external SSD, it's incredibly fast for a flash drive. I regularly use it to move large game installation folders and video files between my desktop PC and my laptop. I was able to transfer a 20GB folder in just a couple of minutes, which is fantastic. For smaller files, it's nearly instant. My Primary Uses & Usability This drive's versatility is its biggest strength. It's become my go-to for a few key tasks: Semi-Permanent Laptop Storage: I leave it plugged into my laptop to carry files I need on the go, effectively expanding its storage without a bulky external drive. PC Building & Maintenance: It's the perfect drive for flashing motherboard BIOS updates on my PC builds. Media Playback: I load it up with movies and TV shows to plug directly into my smart TV's USB port. It handles 4K playback without any issues. A Note on Build and Heat The two most common concerns with this drive are its plastic build and the heat it generates. Yes, the all-plastic construction feels a bit delicate, so I wouldn't recommend putting it on a keychain that gets tossed around a lot. And it does get quite warm during long, sustained file transfers—that's normal for a drive this compact and fast. In my experience, it has never been hot enough to cause concern or impact performance. Final Verdict: The Best Low-Profile Drive Out There If you need a massive amount of storage in the smallest possible package, the SanDisk Ultra Fit is the undisputed champion. It's perfect for expanding laptop storage, for use in car stereos, or for anyone who needs a reliable, high-speed drive that stays out of the way. The convenience and performance it offers are well worth it.
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Reviewed in the United States on June 10, 2025 by Shane Leabhart
Nice USB Drive.
Style: Up to 400MB/s
Size: 128GB
It's a genuine SanDisk. It's portable, fast and reliable! I'm using it as the primary drive on my Raspberry Pi 400 computer. Tested it out and it has 117,281 MB of space for storage. The h2testw results indicated the drive had no errors, Write speed was ~45 MB/s and Read speed was 245 MB/s. I was sent an opened drive, so I sandboxed it and tested it. No problems, everything is ok. It is a reasonable value for the speed and capacity. I'll keep it.
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Reviewed in the United States on October 10, 2026 by David
Problems with SanDisk is NO problem at all
Style: Up to 400MB/s
Size: 512GB
I bought this flash drive a few weeks ago. It began to throw disk errors. I was able to copy my files to another drive. I contacted Sandisk so that I could have this thumb drive replaced. The RMA process was simple. I called SanDisk and a nice customer service rep walked me through the steps. I uploaded my reciept, photos of the drive that showed the serial number. With in a couple of weeks my replacement was sent via UPS. Today 04/16/2026 the replacement thumb drive arrived. It was the best customer experience I've ever had
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Reviewed in the United States on April 16, 2026 by DPS
A Shockingly Capable Drive in an Almost Invisible Form Factor
Style: Up to 400MB/s
Size: 1TB
The SanDisk 1TB Ultra Fit USB 3.2 Gen 1 is one of those rare storage devices that feels almost unreal in the hand—because it practically isn’t there. The plug‑and‑stay design is barely larger than a fingernail, yet it delivers a full terabyte of storage in a form factor that disappears into a laptop, car stereo, or console without protruding or snagging. Out of the box, the usable capacity lands around 931GB, which is normal for flash storage; manufacturers calculate 1TB as one trillion bytes, while operating systems use binary measurement (1TB = 1,099,511,627,776 bytes), so the “missing” space is simply math, not a defect. Despite its tiny footprint, performance is surprisingly strong. Real‑world read speeds hover near the advertised 400MB/s, especially when transferring large, contiguous files. Write speeds are naturally lower—as expected for compact USB 3.2 Gen 1 drives—but still fast enough for media libraries, game installs, and bulk document transfers without feeling sluggish. Heat stays controlled during sustained writes, and the drive maintains stable throughput without the dramatic throttling common in ultra‑compact USB sticks. If you need massive storage in a device small enough to forget about, this is one of the most efficient, unobtrusive solutions available. It’s a deceptively powerful little workhorse that earns its place in any everyday‑carry tech kit.
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Reviewed in the United States on January 3, 2026 by mvepaoijg90r8
Only usable if all you do is sequential reads. Write speeds almost 0 in some cases
Style: Up to 400MB/s
Size: 512GB
Short answer: Suggest you don't buy the 400MB/s version of this Sandisk Fit drive (at least the current version in July 2023) Bought this new 400mb/sec Sandisk 512gb FIT drive (SDCZ430-512G-GAM46) to replace a Samsung 256gb FIT for a Linux standalone install because I needed more space. It took forever to transfer the data, but I didn't worry much about it at that time. But, when it took 30 minutes to boot the PC when the old drive took less than a minute, I decided that something was really wrong. I reformatted the drive and and tested it against the Samsung in Windows using Crystal Disk Mark. As you can see from the results, the Sandisk basically has a zero random write speed. This result was the same across two different Windows 11 computers and several test runs and parameters (The look of those two images was to distinguish between them. It's the same software and same tests run back to back. I've written WD/Sandisk to see if I have a bad drive or if this is the expected performance. As it is, though, this performance makes the drive unusable for any purpose unless all you are going to do is read files from it (but you still have to get them there first). Will update once I receive a reply from WD/Sandisk. Update 6 July 2023: Sandisk suggested the Fit drive I received is defective. Have ordered a replacement. Will update again once I have the replacement. Cudos to WD/Sandisk for their quick response. Update 8 July 2023: Received replacement. This is apparently a product issue overall. Performance of the replacement is nearly identical to the first. After the disappointing first tests with Crystal Disk Mark, I decided to expand the testing to an additional Windows 11 laptop and in Linux and against other thumb drives. If anything, the results were worse by comparison. I also did some less scientific tests moving files with the drives. These "real world" tests backed up the benchmarks. Simply put, there appears to be a serious issue with this product. For those who may be suspicious of benchmark testing, please remember that I only used the benchmarks after having a major issue with using the drive first. The tests were conducted with modern laptops (the oldest from 2020 and the newest a 2023 model). The USB slots were all 3.2 Gen 1 as well. And, I need to mention that I am not complaining because the write speeds are just slow. They are nearly 0 at times. In Ubuntu, running the built in disk test utility, I compared this drive with two other Sandisk USB thumb drives and two Samsung. Write speed averages below: This Sandisk USB 512gb drive (SDCZ430-512G-GAM46): 9MB/s Sandisk Extreme 64gb drive (probably 10 years old now): 40MB/s Sandisk Ultra Flair 64gb drive (2021): 43MB/s Samsung USB 3.2 Gen 1 256gb (2022): 74MB/s Samsung USB C 256gb (2022): 87MB/s (plugged into USB 4 port) Latency was also higher by a large margin with the Sandisk 512gb flash drive than any of the others. The write speed is not zero in this test because it is not a random write only test. Note that the two Samsungs are rated the same maximum read speed as the Sandisk 512gb (400MB/s). The other Sandisks, though faster than this 512gb Fit, are rated much slower. Two other things to note. First, the drive does get very hot, much hotter than the Samsungs. Also the capacity basis is different than the Samsungs as well. Windows and Linux see this 512gb drive as a 465gb capacity drive. The Samsung 256gb drives are truly their listed size. This is something I already knew and isn't a complaint, per se, but just a note.
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Reviewed in the United States on July 4, 2023 by Fletch
Carry it every where for more storage on the go
Style: Up to 400MB/s
Size: 1TB
Love having such a small flashdrive with a ton of storage. Use it have multiple machines with ease. Carry it everyday with me, held up fairly well but the loop has starting to break the drive still works with no issues. Great price for a 1tb flashdrive.
Reviewed in the United States on September 27, 2026 by Butler
This is an amazing tiny but huge storage (1TB) USB flash drive. I highly recommend.
Style: Up to 400MB/s
Size: 1TB
This is an amazing and tiny but huge storage (1TB) USB flash drive. it's quick to store and retrieve and I even use it as my daily drive. I've had one for many years and just upgrade to the same model I liked it so much. I use this drive all day, every day year after year. I highly recommend this model and brand. Excellent product, great value to me. It weighs nothing and can be carried in a wallet. It came pre-formatted and is easily reformatted.
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Reviewed in the United States on September 20, 2026 by Frank in NH
Low profile is awesome!
Style: Up to 400MB/s
Size: 256GB
I recently bought the on-killer-sale Blink video doorbell and Blink sync module. I already have a Blink Unlimited subscription for my mini cams, so video clips are uploaded to the cloud automatically, but since the Sync allowed for local USB storage, it seemed silly not to take advantage of that. Unlike my Wyze and Tapo cams that use Micro-SD cards, though, it requires an actualUSB flash drive, which is certainly bulkier. Fortunately, this Sandisk flash drive is super-low profile, so I don't have a USB stick poking two inches out the side of the module. For my use, this drive is literally plug&play. I just inserted the drive, and the Blink system immediately recognized it, no formatting or extra effort required. Exactly what I needed, and small enough not to get in the way! UPDATE: This little 256gb drive has held over a year of recordings before needing to be cleared. How awesome is that? It's got so many video clips on it that it takes forever to download them all, so I ended up buying a second drive (128gb this time), just so I could switch it out and take my time getting all the recorded clips downloaded. Will I ever need those clips? Doubtful, but it certainly won't hurt to save them. Bottom line, though, is that this is an excellent little drive that's proven to be very reliable.
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Reviewed in the United States on October 6, 2024 by JD