The Lexar MS512-40-431 Memory Stick has 512MB of Memory. Additionally, it's compact, rugged reliable and comes equipped with built-in erasure-prevention. Lexar Memory Stick PRO lights when it writes with an exclusive Data Protection Light that flashes when you transfer data from it. Record your high-resolution digital images and store other types of data safely and can easily at a sustained write speed of 40X or 6.0MB per second*. Lexar Memory stick PRO works with all Sony Memory Stick PRO compatible devices including your Sony MP3 audio recorder, video cameras, and computers with a Memory Stick Slot. Memory Stick PRO also includes Magic Gate--a copyright protection technology that provides secure transfer and playback of commercial and copyright content. Lexar Memory Stick PRO 40X ships with a jewel case in the new Platinum logo.