SanDisk Extreme PRO SDXC UHS-I Card, 64GB

I haven't done any computer benchmarking or anything of that sort with this memory card. I don't believe that those sorts of tests reflect real life use, since a sequential read/write is relatively uncommon, and you're never writing bunches of tiny files all the same size. I have found, however, that real life performance is beyond what I am able to put this card through.I am using this card with a Sony NEX-5N, which is a compact system camera (mirrorless camera) that writes 16.2 megapixel images in a few different levels of JPEG compression and a Sony RAW format. In addition to RAW images, it also records video in MP4 or AVCHD format at 1080p 60fps. I have used this card to the absolute top performance limits of this camera. It allows me to record 1080p60 AVCHD (28Mbps bitrate) with no hiccups or stutters. I can shoot in burst mode for short spurts, and while this card is not going to magically soak up 10 6MB JPEGs per second, I can get about 10 shots in one second and let the card catch up with the image processor's buffer in a couple of seconds. At this time, no card is capable of writing fast enough to keep up with 10 16.2MP images per second, though, so there is no reason to expect it in this card.I can pull the images off this card fast enough that I don't even notice that I'm actually dealing with a block of flash memory instead of a hard drive. I use Adobe Lightroom to import the images, so I'm not sitting there waiting on a Windows File Transfer dialog. I get to deal with a more pleasing interactive file transfer/import by using Lightroom, so I don't have to sit and twiddle my thumbs, but I'm impressed by the speed that files appear in my photo library on import. I believe that anyone who is going to "benchmark" this card with a full HD video camera or a DSLR will be very pleased with their purchase. I can't speak for people who will use the card for file storage/transfer, but my guess is that those users won't be disappointed either.I know this isn't a super exciting review, but this card just works and I think it was a good value.

Very fast and reliable card. Purchased this for mu Sony Alpha SLT-A57 camera. Works very well with shooting pictures in series and for making video. Enough capacity for long trip. Usually RAW format picture is 3-4 MB. This card should hold approx. 18.500 pictures.I already have 32GB card of the same type and this one and never had problems with lost pictures - this one is additional storage in case I want to make video.

Very hi quality, reasonable price.

I bought this for use over the next 2 to 3 years.I haven't had a chance to use it to capacity for either data transfer rate, or storage yet. That said, it has been working great for the video, and photos I have taken on some weekend trips with standard settings on my camera. Read/write is speedy, and transferring onto my iMac is blazing fast.When I've put it through it's paces I'll update my review accordingly.

I’m happy with my Sandisk cards so far. Though I wish the process of determining which card to buy wasn’t such a confusing process.For example, why is the 170 read time card cheaper than the 95 read time card? Aside from a faster read time with the 170 card, it appears they are otherwise the same. So shouldn’t the quicker read time card cost more, not less? And why aren’t the write speeds displayed on the cards like the read times are? Aren’t write speeds more important than read speeds?Having to scroll through product descriptions just to find a card’s write speed is quite annoying, especially since you’re having to rely on a seller to be providing correct information. I really don’t understand this, or why there isn’t a simpler naming system for quickly determining which cards are better than others.These memory card companies and the groups who come up with the various naming systems should really consider using less confusing lingo. It can take hours of research trying to learn what the various codes mean, comparing the variety of card options and specs (each brand with it’s own labeling structure and non sensible naming systems), reading through countless reviews and contradictory replies (like these here), and trying to make sure you’re not buying a fake product (which are prevalent, especially here on Amazon).Another oversight is how these companies don’t make it clear that if you don’t have a fast enough card reader, the top speeds of cards are meaningless.You’d think that with the tons of fake cards being sold (bizarrely under Sandisk’s own seller account), the company would do something about this or restrict sales of their products to their shipping center only. You’d think they’d be more concerned about protecting their brand image and actually respond to the numerous reviews from buyers who have received fakes and are claiming faulty and slow cards.And then there’s contradictory info regarding the best approach to removing images from cards. Some say reformatting cards after each use use is best, while others claim that just deleting images is best. And how long can we safely use a card before we risk possible card failure and losing all of our images? Some people recommend replacing cards every year, while others say they’ll last forever.If a company came out with a simple and easy to understand info system (with both read and write speeds on the cards), an easy way to search a camera model to see what card works best for it, a way to prevent fakes being sold under their own store, a customer service team who actually responds to customer complaints and questions, and a recovery app that actually works; I imagine they’d win over a large sector of the photography community (especially entry level neophytes) who don’t want to spend half a day figuring out what card to buy.