![]() The Wirecutter clocked the read and write speeds of the SanDisk Extreme Pro SD UHS-II USB-C card reader at 256 MB/s and 193.6 MB/s, respectively, nearly three times the speed as any other reader included on our list. In this Article: On Android On Windows On Mac Community Q&A This wikiHow teaches you how to format an SD card, which is a form of removable storage found in cameras, tablets, and phones. ![]() ![]() Newer computers ship with card readers built in, but older computers will need a memory card reader to transfer files with the card. ![]() They can also be used in cell phones and MP3 players to expand the on-board storage, among many other uses. Memory cards are most commonly used in digital cameras to store pictures. For just backup purposes this slower speed maybe adequate however a restore of the entire computer would obviously be very slow. The Mac mini early 2009 - your model has no means of being upgraded nor can you get a FireWire to USB3 adapter, I am afraid you are stuck with the built-in USB 2.0 ports which obviously are much slower than USB 3.0 but at least will let you use the drive even if slower.
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