Have the option of populating your own hard drives.Remotely access any file, or media, with up to 30 usersStore up to 4TB, or MORE, with the extra USB portTransfer large files & stream media in High-DefinitionAccess it with your iPhone, iPad, iTouch, Android 2.2 orWindows Mobile 6.1my-Ditto is Plug 'n' Play, no set-up, no softwareSecure. It comes with a 128-bit AES Encrypted Login and is password protectedmy-Ditto diskless version does not come with hard drive