The  SD Cards have an erasure-prevention switch to keep your data safe. When the switch is in the locked position, it will stop you from accidentally copying over or deleting data stored on your card. Now you know your data will be safe.

Advanced Features:

• Cryptographic security for copyrighted data based on proven security concepts from DVD audio
• High transfer rate for fast copy/download
• High storage capacity
• Non-volatile solid-state; no moving parts maximizes battery power. Data is not lost when power is turned off
• Low battery consumption to maximize battery life in small portable devices
• User selectable mechanical write protect switch on the exterior card casing
• New SD Card slots will accept existing MultiMediaCards, allowing an easy migration path for future SD Cards
• Operating shock rating of 2,000Gs, equivalent to a 10-foot drop to the floor
• Unfazed by drastic weather conditions ranging from blistering heat to freezing cold
• Security level complies with Secure Digital Music Initiative (SDMI) portable device requirements
• The SD Card weighs approximately 1.5g, is 32mm x 24mm, and is 2.1mm thick
  
  
  The SD (Secure Digital) Memory Card is a highly-sophisticated memory device about the size of a postage stamp. SD Memory Cards stand to revolutionize information, entertainment and communications by putting advanced digital storage technology quite literally at your fingertips.
  
  SD Memory Cards are non-volatile, which means they do not require power to retain the information stored on them. They are solid-state devices, so they have no moving parts to skip or break down. They will offer an incredible combination of high storage capacity, fast data transfer, great flexibility and excellent security. And of course, incredibly small size.
  
  SD will facilitate fast, simple, secure downloading of all types of digital files, like music, movies, photos, news even cooking instructions for your microwave. Once downloaded to your PC, you can organize and store the files as you wish. Then easily transfer the files from your PC to a super-compact SD Memory Card, which will be accepted by a whole variety of future SD-enabled products. Of course, you will also be able to directly record your own audio, video, still photos, and more onto SD Memory Cards, as such products become available.