Instructions
Turn off the PS3 and insert the SDHC card into the console's memory card slot, located on the front of the device.
Turn on the PS3.
Go to the "Settings" section of the console's main menu.
Choose "System Settings."
Select "Format Utility."
Choose your SDHC card from the list of storage devices and confirm the format when prompted. The process lasts a few seconds to a few minutes depending on the SDHC card's size.