Why would a 2GBcard format as a 1GB card?

A 2GB card may format as a 1GB card due to a few reasons, such as file system limitations, corruption, or compatibility issues with the device being used. Some devices may not support higher capacities or may have bugs that prevent recognizing the full size. Additionally, if the card has been previously used in a different device or has errors, it might not report its full capacity correctly. Reformatting the card or using it in a compatible device may resolve the issue.