Although SanDisk publishes a silly $199.99 list price, the Extreme 64GB card costs about $55 at various retailers right now. It's two notches below SanDisk's top level—above it, there's the Extreme Plus and the Extreme Pro—but I don't think the extra speeds balance out the extra cost yet.
We tested several recent microSD cards using the A1 SD Benchmark program on a, the XBench disk benchmark program on an Apple MacBook Pro, and by transferring a 2.4GB file to and from the card when it was plugged directly into the MacBook Pro's SD card slot. The SanDisk Extreme outperformed both the similarly-priced and the more expensive, as well as slower and Kingston Class 4 cards we were using to compare. The big differences came when I was copying files from the laptop to the card, a common thing you'd do if you want to play movies on your phone. As you can see in the chart below, the SanDisk Extreme and Lexar 633x cards were much faster than any of the competitors. The Galaxy Note 3's SD card speeds seem to max out at around 20MBps both reading and writing.
SanDisk 400GB Ultra microSDXC UHS-I Memory Card with Adapter - 100MB/s, C10, U1, Full HD, A1, Micro SD Card - SDSQUAR-400G-GN6MA price $ 32. 08 SanDisk 128GB Extreme microSD UHS-I Card with Adapter - U3 A2 - SDSQXA1-128G-GN6MA. Set your store and be able to check inventory and pick up at your local store. Today’s SD memory cards provide large capacities and are inexpensive. But it takes some know-how to pick the right card for your camera and how you want to shoot. The speed of the card you purchase is truly one of the most crucial aspects of buying an SD card, and is one that’s often overlooked by those unfamiliar with SD speed class ratings. It may seem complicated at first, but in reality, it’s fairly simple to understand.
Micro Sd Card Speeds Explained
Only the Extreme card hit both limits. In most mobile use cases, sequential read and write speeds are a lot more important than random read and write speeds. Copying and playing photos, videos, and music all use sequential reads and writes, and that's what most people do with their microSD cards. Random reads and writes are more common when running an OS or application off the card, a much less common use. That said, the SanDisk Extreme card also had some of the best random read and write speeds in our group, both on the phone and on the laptop. The most intense video-recording use in mobile today is recording 30 frame per second, 4K video; the Mobile Extreme card had no trouble with that, either.
Classes Of Micro Sd Cards
In previous tests, we found the to be even faster than this card. But it currently only comes in sizes up to 16GB. SanDisk has an Extreme Plus line with a 64GB card, but that costs around $80 to this card's $55. The SanDisk Extreme already maxes out current smartphones. For the best balance of price and performance, we're happy to give this card our Editors' Choice for a mobile phone or tablet microSD card.