Are you looking to buy SanDisk Ultra 64GB micro SD Card UHS-I U1 A1 C10 Memory Card SDSQXAH-064G-GN6MN in Australia?
The SanDisk Ultra microSDXC UHS-I card is perfect for recording and watching Full HD video, with room for even more hours of video. Transfer speeds of up to 100MB/s ensure that you can move all your content blazingly fast - up to 1200 photos in just one minute.6 Ideal for smartphones and tablets, this card’s A1 rating means that you can load apps faster too.
Please visit SD Card Association For Speed Standards
In general
U1 / V10 = HD Recording
U3 / V30 - 4K Recording
V60/V90 - 8k Recording
U3 / V30 - 4K Recording
V60/V90 - 8k Recording
However in each size of recording, there are different bitrates, hence the overlap on the below chart.
There is also different types and classes of SD cards as seen below
