The BDR-XD04 Slim Portable USB 2.0 BD/DVD/CD Writer is one of the world's smallest and lightest BD/DVD/CD Writers. Its small size makes this External BD/DVD/CD Writer the perfect accessory for Netbook and Notebook computers. The BDR-XD04 easily connects with most computers through the USB 2.0 port (USB cord included). It will write up to 6x on BD-R/ and BD-R DL media, up to 4X on BD-R QL and BD-R TL media, up to 8X, on DVD-R and up to 24x on CD-R/RW media. The latest PureRead2+ technology (Original Sound Reproduction) minimizes the data compensation process PureRead is a unique function that minimizes the data compensation process by diagnosing the disc condition and adjusting the reading method, and attempting once again to reread obscured data to extract the original music when audio CD read errors occur. Such errors are caused by scratches or fingerprints on the disc surface and cannot be corrected by the CD-specific error correction system (CIRC). This Drive features our latest technology called PureRead2+, which is an advanced version of PureRead. The new PureRead2+ algorithm starts up and once again attempts rereading when the initial rereading fails to extract the data. With increased reading accuracy combined with the BDXL compatible pick-up unit that enhances CD reading performance, audio CDs can be read with a high degree of accuracy. Intelligent Operation The drive monitors how it is being used and will adjust its disc rotation speed automatically, meaning it will spin slowly/quietly for audio & movie playback, and quickly for data transfers.