The Western Digital My Cloud Personal Hard Drive allows you to keep all your content in one safe place on your home network instead of a remote server. Its Dual-Core processor delivers speedy file transfers. To instantly expand your storage capacity, simply attach a compatible USB 3.0 hard drive directly to the USB expansion port on the My Cloud drive. With My Cloud's iTunes server, you can easily stream your music collection to any PC or Mac computer with iTunes. Protect your personal cloud from unauthorized access with password protection available for every user. You can automatically make a second copy, or safepoint, of your My Cloud on your home or remote network. Additionally, its synchronization app allows you to select folders that will automatically update across all your computers, ensuring that you are always working with, saving, and sharing the most current versions of your files. This device works concurrently with multiple operating systems including Mac OS, Win 8, iOS, and Android with mobile apps.