The ABSplus for the Secondary Bay is an Automatic Backup System that is hot swappable. The user can schedule a backup of their entire hard drive automatically. What's more, the ABSplus Secondary Bay becomes a fully bootable internal hard drive when inserted into the secondary bay of compatible laptop computers. This ABSplus Module Bay is designed for D Series Latitude D800, D600, D500; Inspiron 8600, 8500, 5150, 5100, 600m, and 500m. For a complete compatibility list please refer to the original manufacturer's web site.