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SDXC cards, Secure eXtended Capacity, will work for cards up to 2 TiB instead of 32 GiB for SDHC cards according to specifications outlined by SD 2.0. Microsoft's exFAT file system is a required aspect of this card.
UHS transfer rate with speeds from 59\0 MByte to 104 Mbytes for four-bit UHS-I bus was also brought out in version 3.0. Subsequent versions have increase speeds with Version 4.0 allowing 156 MBytes to 312 MBytes. This version required an another row of pins.
The latest version, Version 6.0 was brought out February 2016. This version added Video Speed Class. Videos being the most intense user of power requires the most use of cell phones. The latest version can handle video formats like 8K. Speed ratings go to 90 MB/s.
Microsoft's exFAT File System
It is required for SDXC cards to use Microsoft's exFAT file system. Only a small amount of systems use this. For consumers, this means be aware of potential fakes. Make sure you are getting the real thing. Also, SDXC cards are not universally accepted so make sure your phone or other device can handle the card. The Lumia 640 and all later models of Lumia cell phones support the SDXC. Other than that, you need to check with your model cell phone and specifications.
PNY 16GB Micro SDHC UHS-1 Card
This card is great for videos with the UHS-1 connector. Stores up to 5,600 pictures and is magnet, shock, temperature and waterproof.
PNY 32GB Micro SDHC UHS-1 Card
This is a Micro SDHC not SDXC. UHS-1 means ultra high speed and is good for videos. Always check for compatibility first with your cell phone.
PNY 64GB Micro SDXC UHS-1 Card
This card allows for HD video capture and is great for smartphones, tablets and cameras. Up to 60MB/second speed. Stores over 22,000 photos. Since the HDXC chip was created with Microsoft, it is compatible with most late model Lumia phones.