![]() I'm using a 32GB micro SDHC card from Silicon Power (cheap!), so the rate limiter could (theoretically?) be the adapter, but I tested speeds of 20.19MB/s write and 49.34 MB/s read (packaging lists "Up to 85 MB/s" read). Additionally, the SD card reader in the systemprofilerlists the link speed as2.5 GT/s, making it a PCIe bus. I ended up purchasing a Mac Mini (2014) and the SD Card reader is not listed under the USB bus. I was looking into it because of speed, but in the end I didn't need much speed just to run backup and I went with aSDcard. Because of that, I thought that the only advantage to using aSDcard for external flash storage over a USB flash drive was that it would keep a USB port free. So, when I was researching the sdcard reader for the macmini, I thought that they were all driven by the USB Bus. ![]()
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