SanDisk announced that it has begun shipping its new a href="http://macnn.com/rd/153785==http://sandisk.com/products/dslr/sandisk-ultra-sdxc-cards" rel='nofollow'>64GB Ultra SDXC card. The flash media can store approximately eight hours of typical HD video, and can transfer data at up to 15MB per second. Devices compatible with the new SDXC format have only recently been introduced, and include Canon's new VIXIA camcorders and PowerShot cameras. The extra capacity doubles that of the largest SDHC memory card.