More storage with a 2nd laptop hard drive Thanks to HDD Caddy it is now easy to add more storage space to your laptop or Macbook Pro! With HDD Caddy you can add a second internal hard disk drive (HDD) or solid state drive (SSD) to your laptop. No need to carry external USB hard drives or USB sticks anymore! It is easy to install. First insert your own HDD or SSD in the HDD Caddy and then replace your optical drive (DVD or BluRay drive) with the HDD Caddy. HDD Caddy is an ideal solution if you need more storage space or if you want to use a fast SSD with an extra HDD. Enjoy the flexibility of having more storage space.