Best Feature:compatible
Product Quality:great
Value For Money:great

This card was purchased to be used for professional photography shoots, and it has worked perfectly. I've yet to have any trouble with the SanDisk brand, at any time. This card is a Class 10, which means that it is capable of capturing information rapidly, so it is useful for serious photographers and for recording video. Those who require a class 10 already know so, and the rest of this review is intended for those who do not know so, and may find it confusing to navigate the Class number, vs, MB or GB vs. MB/s. I work with many older adults who do not want to be left out of using helpful devices, yet appreciate a little bit more information to help them shop for an item like this one. So, if you are unsure of what you need then this is for you! Usually, if you take casual photographs then you do not need to purchase a Class 10. You can save money by getting a smaller class number, without noticing any difference in your photographs at all. Another way that you can save money is to use cards with smaller capacity (fewer GBs). If you strongly prefer trying to get all of your photographs onto one disk, then the 32 GB will probably allow you to do that, if you have been saving the photos in a format like .jpg. If you have been storing as .bmp ("bit-maps") then each photograph is a very large file, and that is OK, it just means that it probably isn't realistic to have them all on one SD card. The number of them that you would need will vary greatly depending on how many photos you take and save. In that event, get one card and see how many you can store. From that you will be able to estimate how many more cards you will need. Usually, it's best to purchase cards with a LOWER storage capacity. This suggestion is in case one of the cards is lost, so that you do not lose as many files or photographs along with it as you would if you had stored more on a large capacity card. It could be the difference between losing one photo album or your lifetime of photographs. These cards can also be used to store files on them. If you remember being told that there would be a paper-less office (which still hasn't happened), using these cards could allow you to achieve that at home, if you wish. A little thought will show that there is wisdom in keeping separate cards for your emergency information, recipies, estate planning, etc

This thing is a godsend for the things I use it for. I work in the IT department and used to carry around a portable hard drive to store the files I needed and now I just carry this little guy with me everywhere I go. I carry everything from ISOs for Office, Windows, and Dev tools to portable apps for Email, IM, and other utilities. Whenever I need to install something I just plug this in and mount the ISO and it installs way faster than using a CD or installing over the network. I did have to reformat the drive using exFAT so that I could store ISOs larger than 2GB but using FAT is the norm so it can work with OSx as well as Windows. SanDisk lists this drive as having a lifetime limited warranty on their website while Newegg only says 2 years. This means that if it quits working for any reason they will replace it with a refurbished or new drive, unless the reason it stops working is because of physical damage. Nice peace of mind knowing this when youre going to spend 150. As far as design goes, the SanDisk Extreme comes in a metal case with a retractable USB plug. It is notably longer than the other drives I have used but not so much that becomes bothersome. The retraction mechanism works really well and is perfectly smooth and seems to be spring assisted and I much prefer this over using a cap to protect the USB connector as eventually you will lose that thing. The speeds on this thing are amazing, reading and writing files were on average around 200 MBs when copying to and from a Samsung 840 EVO SSD which is plenty fast for anything you need to do, installing programs from an ISO on the device finished within minutes.

As a rule I tend to stay with SanDisk memory cards. I have always found them to be reliable as proven by the SanDisk cards in my old
Nikon D70 which I bought almost 20 years ago. I use two SanDisk 512GB Extreme PRO UHS-II SDXC memory cards in my Panasonic Lumix G9 II and they provide me with the ability to take 6007 high quality JPEG + RAW photographs (or over 10,000 JPEG photographs) per memory card.

Each memory card also allows me to record video:

ProRes format up to HD 60p 422HQ for 2h29m

MOV format up to 5.8K 30p 420/10-L for 5h40m
MOV format 4K UHD 24p 422/10-I for 2h50m
MOV format 4K UHD 24p 422/10-L for 7h34m
MOV format HD 24p 422/10-L for 11h21m

MP4 format 4K UHD 60p 420/10-L for 11h21m
MP4 format HD 24p 420/8-L for 47h08m

This is a V60 speed card (the V90 cards are around twice the price) and the card was still adequate for recording at the above formats (tested by recording a two minute video at each setting).

The 512GB card is the maximum size that the G9 II camera accepts.

I have been using these cards in my camera for over two weeks and have had no issues with their operation.

I recently purchased the 64GB version of the card. While it

claims a read speed of 200MB/s, that requires a proprietary read mode which needs a card reader that they make, this also means that devices such as a camera will never be able to utilize those speeds.

For my testing, I used a Transcend RDF8 SD card reader,

which will not support their proprietary read mode, thus it will be only showing performance under the UHS I standard. This means reads and writes in the 80-90MB/s range. The primary goal of my testing was to determine the write speed consistency, since there are many cards on the market that will list a 90MB/s write speed, but in some cases, they will use low bin TLC or even QLC NAND, and you will end up with a card that will only maintain 90MB/s for a short while before it run out of the pSLC region and moves to the slower NAND. If you only do basic tests such as crystal disk mark or ATTO, then such cards can score high but they will perform poorly as the card is filled.

For the Sandisk Extreme Pro cards, all of the ones I have tried so far,

including this one have used NAND where whether doing an initial write or overwriting non-TRIM NAND, they are able to maintain their advertised speeds from a 0-100% fill, which is what I look for in any card I purchase.

As we can see from the benchmarks, the cards maintained

consistent reads and writes without allowing down even as the card was filled.

Overall this card is able to properly saturate a UHS I interface, and thus offer the full storage performance a UHS I device is capable of, especially cameras. PS, there is no benefit from using a USH II card in a UHS I slot.