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/dev/mmcblk0,/dev/mmcblk1... I think those readers are connected via PCI. Card readers connected via USB see the cards asdev/sda,dev/sdb... I have not seen a USB adapter, that makes linux see it as an MMC device, but maybe there are such adapters. However, the discard (trim) function can be built into the drive itself (I have such a USB pendrive). -- It can also help to 'wipe the whole device' (overwrite with zeros) to make a card or USB pendrive fast again, if it was originally fast, but is slow after a lot of writes,