256GB Ultra Dual Drive Go USB Type-C Flash Drive - Up to 400MB/s, Lavender - SDDDC3-256G-G46L

Super handy device. Much easier and faster than trying to transfer photos from my phone to my computer via a data USB cord which is quite slow and cumbersome. This is also tiny and easy to keep with you. At 256 GB this will hold a lot of photos and videos and makes it easy to share, copy, save to computer, or just store your photos so they aren't filling up your phone storage. I've always had good luck with SanDisk products and most all of my flash drives, cards, and readers are SanDisk. This is very sturdy, well made, and the spinning cover is perfect for protecting the end and easy to switch between the C and the A USBs. Well worth the price.

Works well, easy to use, and it's very convenient to have both USBC and USBA on the drive. It's a good storage amount for the price. Overall, Fantastic quality

I purchased this device early in 2025 and have used it for several needs. Just recently, I discovered another great use as added storage capacity for my iPhone 16. This really works well and the size is great for this purpose. I may buy another for a new use.

This works both on macOS (Yosemite all the way up to Sonoma) and Windows (10, 11). I am able to easily transfer and work with (print, edit) files on this flash drive no matter which system I am using. I have also used this drive while plugged into my iPhone 15 and it works just fine. Using the Files app and browsing to the flash drive, I can see and open the files on it with no problem. The entire device itself is quite small and portable, so it fits in any pocket, pouch, or on any keychain without taking up a lot of space. While I have only been using it for a short while (three weeks), it has always been available and reliable, with no hiccups or complaints from either Windows or macOS about the drive not being visible/readable/ready. The only reason this is not a 5-star item is the physical design. I like that you can have either side/connector (USB-A or USB-C) out/open by spinning the flash drive, but that also means that whichever side is out is exposed. This device DOES NOT come with any kind of dust/protective cover for either connector. For that matter, the side that is not exposed isn't exceedingly well protected either, but it is better than nothing. I would like it if the device came with protective caps for the connectors or allowed you to control exposure of the connector ends. Shy of that one issue (lack of dust covers for connectors), this is a very good flash drive.

SanDisk’s 512GB Ultra Dual Drive Go USB Type-C Flash Drive (SDDDC3-512G-GAM46) is an impressively versatile, high-capacity flash drive that has greatly enhanced day-to-day data management and device connectivity. This in-depth review covers real-world usability, speed, durability, and features, making it an essential guide for anyone considering this dual connector drive. The most notable advantage is the dual connectors—USB-A and USB-C—which allow for seamless file transfers between legacy and cutting-edge devices. This flexibility makes it ideal for working with smartphones, tablets, laptops, and desktops. No need for adapters, and switching between devices is as simple as flipping the drive’s cover. It’s especially useful for consolidating files or backing up media on the go, making transitions between work and personal devices absolutely hassle-free. With its 512GB capacity, the Ultra Dual Drive Go wipes out storage anxiety. It easily stores entire photo libraries, massive video files (including 4K and 8K footage), and countless documents or software installers. While the advertised read speed hits up to 400MB/s (USB 3.1), and typical transfer rates are fast and reliable for everyday use, some users note that sustained large writes (like transferring several 100GB videos) may cause the device to heat up and throttle speeds. Nevertheless, moves like a 160GB file in under 3 minutes show it’s more than competitive among similarly-priced drives. It’s not engineered for specialized pro-level tasks (such as direct ProRes video recording on premium smartphones), but for most consumer needs, performance is more than satisfactory. The sturdy swivel design both protects the connectors and makes the drive highly portable—perfect for pockets, bags, and busy schedules. The keyring hole offers extra convenience, and the compact form factor is praised for ease of use and daily carry. Notably, this isn’t a fragile accessory; the robust build feels solid and holds up well to constant handling. Setting up and using the Ultra Dual Drive Go is a breeze. Plug-and-play compatibility ensures immediate file access, while advanced users can enjoy features like automatic photo backups through SanDisk’s Memory Zone app on supported Android devices. Whether managing files between a USB-C smartphone and USB-A laptop or freeing up storage on-the-fly, it consistently delivers a smooth experience.

Quick transfer of data on/off my MacBook Pro. Lightweight and durable. Inexpensive for what it can store-64Gb. Since it is plastic and not metal, it gets warm but not hot. I bought ten of them. Light enough to have four on my key ring.

I bought the 512GB 150MB/s version, the slowest version with the largest capacity. It initially looked good because it has a nice form factor of USB C and USB 3.0 connectivity. It quickly became apparent that this is a terrible product. It simply is unusable due to its insanely slow transfer speeds, and it's by far the worst USB storage device I have used. It feels like you're back in 2002 using the first generation of USB thumb sticks, because the drive would freeze up when you try to open a file or transfer something in. I tested this drive extensively to try to figure out what was wrong. I tried reformatting to ExFAT formats to resolve any compatibility issues with Mac vs PC. I tried using a NTFS reader app on the Mac to read/write NTFS directly. In both scenarios, the drive is painfully slow, and it was slightly faster and more stable in the NTFS format with a NTFS reader (Tuxera). In the ExFat format, it was just unusable and freezes up whenever a file is transferred. I tried using it on PC, and the speed tests (results of tests in images attached) shows ~14MB/s transfer speeds. That is comically slow. I tried both USB 3.0 and USB C ports on the PC, with similar results. I tested on USB C on the macbook air M1, and it was ~20MB/s, slightly faster. My conclusion from my testing is that it's simply not equipped to handle transfers of any large file. This is not a compatability or formatting issue. This drive is slow whether you connect to a Mac or PC. It's slow if you use the USB C port or the USB 3.0 port. It's slightly better if you use NTFS format and use it on windows. This drive is maybe enough if you're someone who only has tiny files, but why would you put yourself through this painful process to use the drive. Just avoid this and buy something with a faster transfer speed.

Needed a large enough USB storage device that would work both as an OTG device for backing up phone data off multiple devices, but also on standard PC's if necessary. This was the perfect choice. On one end is USB-C male connector, which actually has a longer metal plug. This make it easier to fit the USB-C port on the phone without taking off the phone case. The other end is a standard USB-A male connector that is also longer and can be inserted into recessed ports on a PC or laptop. The physical drive itself is tiny. And the casing is plastic (not metal). So it's extremely lightweight, and narrow enough so that it can actually fit inside the cap of fountain-pen. The only complain I have is the SanDisk software on Android. It kept failing to recognize the exFAT format that was default on the drive. After some troubleshooting, I realized that the drive first had to be formatted by Android (via Android OS's Storage setting), and not via Windows OS. Once the blank drive was formatted via native Android's Storage option for exFAT, it worked on Android across multiple phones, and also in Windows. Otherwise this software issue, this device was perfect for my needs.