SanDisk’s shares fell 5 percent in extended trading, after the company also reported lower-than-expected revenue for the third quarter. SanDisk, a supplier of memory chips for Apple Inc’s iPhones, in June bought Fusion-io Inc, a solid-state storage products maker. Rival Samsung Electronics Co Ltd said last week that it would spend $15 billion to build a major new factory in South Korea to make either memory chips or logic chips. SanDisk forecast revenue of $1.80 billion-$1.85 billion for the fourth quarter ending December.