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Re: Possibly erroneous "device not present" message during boot

Le 15/04/2017 à 02:37, David Wright a écrit :

Of course, an SD card can be
made to look like a USB stick just by sticking it in a card reader.

I guess you mean "in a USB-to-SD card adapter", which translates a SD card into a USB mass storage device (/dev/sd*). A SD card reader such as the one the OP has just exposes the SD card as what it is, a SD/MMC card (/dev/mmcblk*).