I'm not a hardware expert, but I can tell you what is written on the chipset which is (Kingston SDC4/4GB) and it reads 3.75 GB on my computerI don't know about SD card reader chipsets, but most likely it will not read a 4gb.
I have noticed that most devices say up to 2gb or up to 4gb.
Besides I believe there are no 4gb SD cards, only SDHC.
You may want to open the device and check the ID on the chip, Samsung's and Hynix's ID sheets are all over the internet (to see the real capacity of the chip)
In some rare cases people found bigger chips formatted at a lower size.
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