2Gb usually is 2Gb.
Use Windows' "Disk Management" tool to get a graphical view of your SD card's partitions.
Delete all of them (on that card!). Only write images to blank SD-cards, for TSW-panels I know they include multiple partitions and wouldn't work otherwise. PMC3 as well as all 3-series processors are Windows Compact based and should contain multiple partitions as well.
