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I was hoping someone would have these details here. Hi Phoenix2000. Thank you for reaching out to Microsoft Community. For Surface Pro 7, SD card- SDXC slot (up to 2TB storage capacity)@ UHS-1 Speeds (50-104MB/s). The camera supports SD, SDHC, and SDXC memory cards, including SHDC and SDXC cards compliant with UHS-I. Cards rated UHS Speed Class 3 or better are recommended for movie recording; using slower cards may result in the recording being interrupted. When choosing cards for use in card readers, be sure they are compatible with the device. Transcend's SDXC/SDHC 700S memory cards provide the performance and capacity necessary to harness the full power of your UHS-II compliant DSLR cameras and camcorders. With the incredible transfer speeds, the cards allow professional outdoor photographers and videographers to capture flawless RAW images, and record ultra-high quality 8K videos. The Sony A9 supports UHS-II in Slot 1 to provide high write speed. Both slots support UHS-I including the fastest UHS-I mode SDR104. Using UHS-II cards provided up to 152 MB/s average write speed, while UHS-I cards averaged up to 78 MB/s. One important observation is that the A9 has a huge buffer capacity.

Microsoft Surface is a great piece of hardware that has a beautiful 2-in-1 form factor, great performance, and the most cutting-edge technologies. When it comes to storage option you will be limited to choose from some preset configurations that sometimes don’t fit your needs. Fortunately, most Microsoft Surface models except the Surface Laptop are all come with an SD or MicroSDXC card slot that you can use to expand your device’s storage.

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MicroSD card buying guide

There are several things to consider when you’re choosing a MicroSD card for your device. MicroSD card’s capacity, speed, type, and price are the most important things you need to know about when it comes down to the final decision.

1Speed Class

According to the SD Association, here we have an overview of memory’s sequential write speed information for different speed classes of MicroSD cards.

*UHS = Ultra High-Speed

2App Performance Class

There is also another standard that is being used for application performance classification. This standard will show you the random read and write performance as input/outputs per second (IOPS).

3Capacity Standard

You might want to know as well about what is the maximum MicroSD card’s capacity that your Surface can support. Here is the SD card capacity standard.

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Since all Microsoft Surface devices are using MicroSDXC host controllers, so your Surface technically can support MicroSD card with capacity up to 2TB. Learn more about Microsoft Surface specifications by downloading the Microsoft Surface RT User Guide.

Now you have a better understanding of MicroSD Card’s speed and capacity standard. Here, we have round up the best MicroSD cards that are compatible and work well on Microsoft Surface.

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Our Picks: Best MicroSD Cards for Microsoft Surface

To learn more about individual Micro SD card, here we have listed the specifications and our thought on each item here:

1 Sandisk Ultra Micro SDXC UHS-I Card

• Available from 8GB to 400GB.
• Class 10 / UHS-I, speed up to 100 MB/s.
• Load apps faster with A1 app performance class
• Waterproof, temperature proof, shockproof, and X-ray proof.
• Included SD adapter.
• 10-year limited warranty

If you want fairly big storage for your Surface, you can get this 200GB MicroSDXC card at an affordable price while it is on sale. The Sandisk MicroSDXC UHS-I card features a class 10 speed rating.

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It can support faster data transfer speed up to 100MB/s which is great for playing large videos. As the rated as A1 App Performance, it is able to run most apps and games without any slow down. This Sandisk MicroSDXC also has great protection with waterproof, temperature proof, shockproof, X-ray proof and magnet proof.

2 Samsung EVO UHS-3 Class 10 MicroSD Card

• Available from 32GB to 256GB.
• Class 10 / UHS 3, 100MB/s read and 90MB/s write speed.
• 4-proof protection from water, extreme temperatures, and other harsh conditions.
• Included SD adapter.
• 10-year limited warranty

The next one is from Samsung, The EVO UHS-3 card also rated as a class 10 and UHS-3 transfer speed. It can transfer up to 100MB/s and 90MB/s read and write speeds respectively. It is also able to record the 4K UHD video recording and handle most apps and games without any problems. It does come with a MicroSD card adapter so you can use it in any computers with a full-size SD card slot.

3 Lexar Professional 1000x microSDXC UHS-II/U3

• Using high-speed UHS-II (U3) technology.
• Transfer speed up to 150MB/s.
• Verified to be compatible with GoPro cameras.
• Can read can capture 4K UHD and 3D video.
• Included a MicroSD UHS-II reader for the best possible transfer speed.

If you need the fastest expansion storage on your Microsoft surface devices, you can count on this Lexar Professional 1000x. It using the latest UHS-II/U3 technology that can deliver the fastest transfer speed up to 150MB/s.

It will let you work on big documents or projects file that needs the high speed of both input and output. It’s verified to work great with GoPro cameras for capturing 4K UHD videos.

4 BASEQI Aluminum MicroSD Adapter for Surface Book

• Designed for Surface Book.
• Made from aluminum material.
• Easy to insert/remove.
• Supports UHS-I.
• Model 350A for 13.5″ Surface Book and Surface Book 2.
• Model 351A for 15″ Surface Book 2

If you are looking to expand the storage of your Surface Book and Surface Book 2, the only thing you can do is using the SD card slot. Since it is a full-sized SD card slot, you will need a full-sized SD card or SD card adapter. However the depth of the slot is about half-length of the card, so it’s not a good idea to use the full-sized SD card as a permanent solution to expand the storage.

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Fortunately, there is a MicroSD Adapter made by BASEQI that is firm and nicely fit the Microsoft Surface Book card slot without sticking out. With that said, you can now use any microSD card to expand the storage on your Surface Book. It has the same color and aluminum designed just like the Surface Book’s chassis.

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Conclusion

Those are the best MicroSD cards in terms of capacity, speed, and price. If you want the most affordable large MicroSD card, we recommend the Sandisk Ultra 200GB Micro SDXC UHS-I card or Samsung 128GB EVO UHS-3 MicroSD card. If the speed matter you the most the Lexar Professional microSDXC are what you should consider. Finally, if you have Microsoft Surface Book you will need additional special MicroSD adapter made specifically for Surface Book.