For transferring files to the player, a special version of the Napster 2.0 software that contains the device drivers has to be installed. After that, it is supposedly possible to maintain its content either via Napster or Windows Media Player. The unit was tied into Napster's DRM, which made it impossible to re-upload purchased files to another PC. Downloading more than 4,000 tracks to the device can destroy its internal library, so that its disk space cannot be used properly in most cases.