SanDisk Corp. has doubled the capacity of its SanDisk miniSD cards to 1 GB. MiniSD cards are used in mobile phones that have multimedia capabilities such as digital cameras, music players, games and video recording and playback.

A 1GB card makes it possible to store approximately 16 hours of MP3 songs, record up to several hours of MPEG-4 video or take more than 2,000 digital photos on a 1-megapixel mobile phone. The miniSD card includes...