Many of the most popular digital cameras on the market use the ubiquitous Secure Digital cards as do lots of PDAs and PMP devices. Typically to write data to and from the SD card you have to connect the SD equipped device to your computer or use a card reader. The problem come sin if you need to transfer data to or from the SD card and you don;t have a card reader or the cable to connect the device to a PC. OCZ has a very good performing SD card that features a USB connector built-in allowing you to directly connect the SD card to your PCs USB port called the OCZ Secure Digital Dual Memory Card and if you use SD equipped devices you should check it out.