updated 02:20 pm EDT, Tue March 27, 2007
SanDisk 4GB M2 card
SanDisk is expanding its smaller Memory Stick Micro (M2) line with a 4GB card, set to ship sometime after May. The company is already selling 512MB, 1GB and 2GB M2 cards, but according to estimates, 4GB should be enough to hold approximately 1,000 songs, 2,000 photos or 20 hours of MPEG-4 video. The main drawback to M2 cards is that they are compatible exclusively with Sony Ericsson phones, such as the Walkman line -- elsewhere, microSD is the industry standard.