1525 Virtual Disk Image Aggregate VDI (Virtual Disk Image) is the native format used for storage by VirtualBox virtual machines. 1 Digital Preservation Department / The National Archives 27 Mar 2015 27 Mar 2015 fmt/726 PUID vdi File extension 1050 Virtual Disk Image 64 byte offset: 7F 10 DA BE magic number (..Ú¾) 1 Absolute from BOF 64 7F10DABE