This is a great idea as the SD card slot is on the back of my iMac and is difficult to reach due to a cramped desk and two monitors. Unfortunately, the card can only be attached as follows: plug the card into a spring-loaded (female) extension cable, and plug the male end of the extension cable into the SD slot. You can unmount as usual, but insert another SD card into the extender, the card will not mount until you remove and reinsert the male end of the extender. No improvements.
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