These are memory cards that I usually use in my digital camera to take photos or video. The speed of 80MB / s is the speed of playback. One that counts is the write speed (40MB / s on average, as measured on my PC, the card was in the slot reserved for this purpose), which allows for HD video, or if you set the photo with D800 or other NPC 36Mpixels in RAW mode, to save an average of one image / second, which is a lot. And a thousand images in RAW mode 36Mpixels memory card, hence the importance of finding a reliable storage solution at lower cost.
Buying "bulk pack" reduced the price of another, without affecting the quality of the product, in principle. Another advantage; SD card is delivered in a plastic box, convenient for storage in the camera bag. Especially when we know that this plastic box is not included when you buy this card in cardboard / plastic packaging usual.
