SanDisk 128GB Extreme microSDXC UHS-I Memory Card with Adapter - Up to 190MB/s, C10, U3, V30, 4K, 5K, A2, Micro SD Card - SDSQXAA-128G-GN6MA

This card is everything I needed and more. I’ve tested it thoroughly in both my Steam Deck and Nintendo Switch, and it performs perfectly—no lag, no crashes, no issues with read/write speeds. Games load fast, updates install quickly, and large files transfer without any hiccups.The 2TB capacity is an absolute game-changer for anyone running a big emulation library or downloading tons of games digitally. I’ve filled this with hundreds of gigabytes worth of games, videos, and apps, and it hasn’t skipped a beat. It’s rated up to 240MB/s, and it holds up well even under heavy use.I also appreciate that it comes with an SD adapter for easy use in laptops and card readers. I’ve used it for 4K video capture too, and it hasn’t dropped a single frame. It's V30 and A2 rated, which means it's optimized for both video recording and fast app performance.Highly recommend this to anyone looking for high-capacity, high-speed, reliable storage—especially for gaming handhelds like the Steam Deck or Switch. I’ll definitely be buying another one in the future.

This card delivers fast read/write speeds and works flawlessly in my drone and GoPro. Handles 4K video without lag or dropped frames. Transfers to PC are quick, and it’s held up well in heat, cold, and even light rain. A solid choice for anyone needing dependable, high-speed storage.

I have been buy SanDisk for years and they never disappoint. All of their SD cards and USB drives have a great longevity and are always as fast as advertised. I always by the faster versions in the type I need for best performance. These work great in N SW1, Samsung phones and tablets (and probably other brands), Raspberry Pi, and anything else that needs a micro SD card.

I am extremely happy with the functionality of this microSD card. The quality is fine, is easy to use, and I think it was priced well. It’s working great with my switch oled.

I’ve been buying a lot of switch games lately and some of them come with digital codes for download so I upgraded from my old card. Now I can download many more games. Solid card, no issues so far.

Perfect. Works as it should.

The SanDisk 512GB Extreme microSDXC is a high-performance memory card perfect for gaming on the Nintendo Switch. With read speeds up to 190 MB/s and write speeds up to 130 MB/s, it handles demanding games and app loading with ease. The 512GB capacity stores dozens of games, and its durable and It includes an SD adapter and backed by a lifetime warranty.Pros:Huge 512GB capacity.Durable and reliable.Cons:Slightly expensive.Verdict: Excellent for fast, reliable storage. Great value at $35.69.Rating: 10/10

I am a big fan of SanDisk. They are my "go to" brand when purchasing flash memory devices. When I first started purchasing flash memory devices I tried a variety of brands. I learned the hard way that some less expensive devices just didn't last, lost data, or did not always read like they should. Once I purchased SanDisk products I just didn't have problems with them. I have purchased SanDisk SD cards, micro SD cards, and thumb drives. My experiences have all been positive. I still have some from several years back that continue to function well. Most important to me is that I find that they are at a nice price point and, as mentioned, work well over time. I use their micro SD cards for my phones (those that still accept them), my security cameras, and my dash cams. I use this specific series, "Extreme" for dash cams. I use the "Ultra" series for my phones and security cameras. My apologies but I am not an expert at doing bench tests on these products. My only experience is actual use. So my gauge of quality is, "Do they work when I need them to?" Unfortunately, the only measure of this is when they go bad, which does not seem to happen with how I use them. As mentioned, I just don't have the issues I had when I purchased lower priced (quality?) devices. I am sure there are some much more knowledgeable reviewers who can report on transfer speed. It would be great to see some of these reports because I have been wondering lately if some of the "higher end" series of micro SD cards are worth the extra price.When I was looking for dash cam micro SD cards, I did a little research and found several reviews that included the SanDisk "Extreme" so I did step up and paid the extra for the "Extreme" series.I also know that I have never had any issues with formatting a SanDisk card.Most of the micro SD cards I order come with an SD card reader. That is nice even though I now have several. That said, I saw that SanDisk also makes a "USB-A" micro SD card reader. The micro SD card loads from the end rather than the side like many of the card readers. I may end up trying one of those at some point. Or, wait to see if they come out with a "USB-C" version.Recommend: YESQuestions: Just wondering if there is really that much difference between the various "series" that SanDisk has for their micro SD cards.