Sd unknown capacity
Make sure the device you're trying to use this in says it will work with this capacity (4GB) and type (SDHC).
Many older devices can not cards of this capacity and greater, or work with SD (not SDHC) cards - even though they look identical.
If the device is suitable for use with these capacities and types, next check the list of the specific cards supported. You should be able to find this either in the manual or an updated list on the manufacturer's website.
Good luck!
×