SanDisk 256GB Ultra Dual Drive Go USB Type-C Flash Drive - Up to 400MB/s, Absinthe Green - SDDDC3-256G-G46AG

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.

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.

So far, I've been loving this drives speed and capacity. However, performance has been lacking as i noticed it disconnects rather frequently when used with my tablet and phone. Will updte when/if i find a fix but so far, Not deserving of a 5 star review. Update: Comparing this to other drives. It's slow. Annoyingly so. Writing to it literally takes about 2 minutes before even a small piece of the loading bar comes up. Even reading files takes a while. 🤦🏽‍♂️ Update 2: So I double checked the specs of my laptop just to make sure I'm not crazy. Confirmed the laptop has 2x USB Type C-3.2 Gen 1 ports and the drive is also USB Type C-3.2 Gen 1 and I have never seen this drive even get close to the advertised speeds. Extremely Disappointing! Update 3: I've found that the frequent disconnecting issue was a result of user error. Quick and to the point, Don't have your device in battery saver mode. I've had no issues with connectivity after finding this out. While the older 128gb sandisk pendrive i had didn't have the same issue this one has. I still prefer this as it doesnt get as hot as the older drive while having 4x the storage and slightly (albeit still slow) faster speeds. Worth it!

There are less expensive drives, but I would rather trust an established name like SanDisk with my personal data. The dual format connector is a great feature

Small and very fast read and write. Convenient to be able to use without an adapter

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.

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.