I'm sure your problem was that the SD card wasn't written in a way to make it "bootable". When the SD card is in the Nook and then hooked to the computer, I think the Nook is handling the "low level" formatting, and so it isn't writing the information in the correct manner to enable the SD card to be made bootable. One way you might check is if the "size" of the SD is reported as being approx 32 megabytes. When the image is written correctly, the card is partitioned to have a single 32 mb partition (or somehting small like that). Even if the card is a 8gb card, it will only look like a 32mb card when the image is properly written.
Regarding the Nook cable, it is a USB cable with additional pins for charging at high amps then the USB standard allows for; but any MicroUSB cable will handle the data issues, it just won't charge at the higher rate (and even discharge when plugged in if the Nook is being used in a battery intensive fashion).
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