The Secure Digital High Capacity format uses a FAT32 file system to store data in portable devices. It improves upon older standard SD cards by changing the addressing scheme from byte-level to block-level, allowing it to break the two-gigabyte limit. These cards are widely used in embedded systems, data loggers, and consumer electronics.
Heard on the job
Make sure the bootloader actually supports block addressing, or it will just hang when you insert an SDHC card.