Add a Second Hard Drive to your Macbook, Powerbook, or iBook!Double the storage capacity of your Apple Laptop with a Dual Drive!The DualDrive replaces your internal optical drive with a hard drive of your choice (Only 2.5" SATA drives will work in the Dual Drive). As a result, you will no longer have a CD drive in your unit. You can still have an external cd drive by purchasing an external drive such as our External Superdrive DVD/CD Burner and Reader To see an installation guide and demo, click here. If you're the type of person who doesn't use your optical drive much, but needs extra storage capacity on the go, then the Dual Drive is what you need.How to Max out your storageModelInter nal Max CapacityDualDrive Max CapacityMaximum CapacityMacbook Pro 17 Inch1TB1TB2TBMacb ook Pro 15... Less