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I didn't know myself, so I looked it up on PCMag.com. Here is my edited version, for a (fairly) short answer:
SD cards are also available in various speeds. If you're using a point-and-shoot camera... speed class won't matter much. If you're shooting high-resolution ... photos ...you need a quick card to take more … see more
I didn't know myself, so I looked it up on PCMag.com. Here is my edited version, for a (fairly) short answer:
SD cards are also available in various speeds. If you're using a point-and-shoot camera... speed class won't matter much. If you're shooting high-resolution ... photos ...you need a quick card to take more than two or three shots at a time. SD cards are generally described by their Speed Class, ranging from Class 2 (slowest) to Class 10 (fastest).
...Class 2 is suitable for standard-definition video recording, while Class 4 and Class 6 can record high-definition video. Class 10 is the card for HD video ... According to Sandisk...Class 4 cards offer read/write speeds of 15 MBps, Class 6 cards ...20MBps, and Class 10 cards ...30MBps. Kingston...describes its Class 4 (at) 4MBps..., Class 6 at 15MBps, and Class 10 at 40MBps...
...Since even smartphones can record HD video these days, Class 2 cards aren't the best choice. They're simply too slow to record HD video...
For their complete description, go here: http://www.pcmag.com/article2/0,2817,2388408,00.asp
Hope this helps!
Mark see less

By Mark A. on November 7, 2013
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Don't know.
By Phil Hays on January 15, 2014
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I add and delete files and folders all the time. Its like a mini external hard drive. Hope that answers your question.
By Patricia on March 23, 2017
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as long as they are stored onto the disk. Try using a usb cord to transfer to you computer then to your phone.
By Chris on February 27, 2014
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A USB reader is a small device would allow you to access the SD card's files via the USB port of your Mac or PC. You would insert the SD card into the adapter, and then the adapter into your computer.
By MintCell SELLER on November 13, 2015
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I don't know, however I can get over 400 on my 2gB. Jim
By Lizette McLane on August 1, 2014
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If your digital camera us equipped with SD card, then yes it will work
By Andy on January 3, 2017
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Isabelle, I'm not a micro expert, but it appears this SanDisk will work with the Transform Ultra. A few sites suggest it would be compatible: http://www.samsung.com/us/support/owners/product/SPH-M930ZKASPR#content2; http://reviews.cnet.com/smartphones/samsung-transform-ultra-boost/4505-6452_7-35017873.html; http:… see more Isabelle, I'm not a micro expert, but it appears this SanDisk will work with the Transform Ultra. A few sites suggest it would be compatible: http://www.samsung.com/us/support/owners/product/SPH-M930ZKASPR#content2; http://reviews.cnet.com/smartphones/samsung-transform-ultra-boost/4505-6452_7-35017873.html; http://downloadcenter.samsung.com/content/UM/201111/20111102064955068/SPH-M930_User_Guide.pdf see less
By Mark A. on January 16, 2014
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No unless they put the item in a ridiculously large box with a volumetric weight of 1.2lbs. The actual weight of the sd card is a few ounces and I think it ships in a bubble wrap envelope for items that small
By A. Smith on November 16, 2013