Manufacturer Speed Determinations

Even within the same manufacturer, labeling may not tell you anything about the natural differences between form factors. For example, SanDisk may have developed a card in MicroSD format that is faster than the fastest cards on the SD card and labeled both "Extreme". This does not mean that the MicroSD format is inherently better. This means that you can currently buy a faster MicroSD card from SanDisk than SD cards with the same label.

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