Flash Backed Write Cache
Flash-backed write cache HP introduced the flash-backed write-cache (FBWC) system in the fourth quarter of 2009. The FBWC uses NAND7 flash devices to retain cache data and super-capacitors (Super-caps) instead of batteries
to provide power during a power loss. The FBWC offers significant advantages over the HP Battery-backed write-cache (BBWC) system. Since the FBWC writes the contents of memory to flash devices, there is no longer a 48-hour battery life limitation and the data will be posted to the disk drive on the next power up.
之後我打電話問HP 客服, 他也說FBWC是不用電池的