SanDisk 16GB Extreme SDHC UHS-I Memory Card - 90MB/s, C10, U3, V30, 4K UHD, SD Card - SDSDXNE-016G-GNCIN

I tested this drive with a USB adapter for a PC, and tested with large video files to get an idea of the read/write speeds.The read and write speeds exceeded the specs, working with about 15GB of data. I was reading at about 185 MB/s over 15GB of data read from this drive and written to an NVMe which is a bit faster. Considering this is rated for 150MB/s, that's VERY good.The write speed was also excellent. This disk is rated for about 70MB/s and I got closer to 85MB/s. Once again, writing to this drive, and coming from an NVMe, it was writing at about 85MB/s, and this is rated for 90MB/s.However, the way my system wrote to this drive was almost as if this has about 4GB very fast cache, or it has a small segment of very fast storage, because my system showed that within about 5-6 seconds it had already written about 4GB to it. Then it slowed down and it was showing something like 160 - 180MB/s for a time period, and then the write operation for the PC showed as complete. The USB adapter though was still showing activity, meaning that data was still in the process of getting written, and probably from it's fastest storage to slower storage. The time I calculated for the write time included all the time that the USB adapter was showing activity. If I would have based the write time on when the computer showed the write was completed, the write speed would have been more like 100MB/sI tried to read about these SD cards but couldn't see anything about faster cache or a small amount of fast storage, but that's the way the disk seems to work as far as what the Operating System showed. I know that modern SSDs use that strategy to improve performance, so when you test write operations, you always have to write more data than the size of the cache to see the speed that the main storage runs at.Also, the read/write speeds are listed as "up to", so there is no guarantee that you'll get the speeds that are listed for any period of time. All I know is that working with 15GB of data, this disk performed exceptionally well.Either way, I'm very impressed with it, and as long as it lasts a long time I'll be happy. It was a great price when I bought it and worth every penny.

The SanDisk 128GB Extreme SDXC UHS-I Memory Card delivers impressive speed with up to 150MB/s write performance, perfect for capturing high-quality photos and 4K videos. I don't use any other brand and trust their reliable brand because it ensures durability, quick writes and dependable storage for all your photos.

It gets the job done and that is all that's needed. I would recommend and also purchase again. Thank you for a good product. My camera and I love it.

Great price and working perfectly

The SD card was delivered quickly, and seems to work great. I only just started to use it, but it looks like it will work well. It has a fast right time and will hold a lot of pictures. Delivery was on time and met my expectations.

Solid SD card for photos

This card was used to store the operating system for an industrial machine.Any time the machine needs maintenance, adjustment, to have a jam cleared, or other type of human intervention, power to the machine must be shut off. After the maintenance has been performed, the machine then takes a few minutes to load the OS and start back up.With over 70 machines on site, delays in starting machines can start to add up. The faster the machine can boot up, the sooner it can return to service. I've had excellent success with USB flash drives from SanDisk for both speed and longevity, so this SD card seemed like a winner.It appears to operate as advertised, and after a couple years 24/7 use, it is still working just fine.

Having UHS-II is nice but having more memory cards with lots of space is better than having less cards because like all things, it's not a matter of "if" it will fail but "when"—so load up on lots of SD cards. Don't get too big because if you lose that card, that is a lot to lose.Everyone who buys memory cards should test if it's fake, so if you're on Mac, try Disk Speed Test by Blackmagicdesign.If you're on Windows, I recommend h2testw.1. Insert your SD card into your computer2. Run h2testw.exe3. Select “English”4. Click “Select target”5. Select your SD card’s drive letter6. Ensure “all available space” is selected7. Click “Write + Verify”8. Wait until the process is completedThe test took about 30min for me. The time varies due to SD card size.If the test finished without errors, your SD card is good and you can delete all .h2w files on your SD card.If the test shows any other results, your SD card may be corrupted or damaged and you may have to return/replace.I bought 4x of SanDisk 128GB when it was $24 for my mirrorless. It's Sandisk—reliable, durable, and best bang for your buck.