SanDisk has announced the world's largest SD memory card. SanDisk's 512GB SD card will hold all the 4K video you can handle. You can store about 200,000 8-megapixel JPEG shots on this single card if you wanted to.

If you've been dabbling in 4K video recording, you probably know that most SD cards won't cut it; you'll be thankful if you have enough space for a wedding video, let alone a magnum opus. SanDisk may have a solution for that space problem in its new, extra-capacious 512GB Extreme Pro SDXC card. It's fast enough (95MB/s) to shoot interruption-free 4K, but also has more than enough storage for a day's worth of movies and high-speed photography. Capture 60Mbps video on Sony's AX100, for example, and you could theoretically keep going for almost 19 hours. You're going to pay dearly for all that headroom, though.

The 512GB card sells for a whopping $800 -- unless video production is your bread and butter, you're probably better off "settling" for the Extreme Pro's 128GB or 256GB variants.

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