This mobile hard drive rack for 2.5 inch laptop SATA hard drives fits in a 3.5" bay. You can mount up to two 2.5" SATA drives. A great way to mount your 2.5" hard drives into your desktop computer or server. Since you can easily pop the hard drives in and out, this is a great device for multiboot systems where you're booting into different operating systems or with different configurations. Easy to install and packaged with everything you'll need, this unit is also perfect for getting access to your data on a failed laptop where the hard drive is still functional. The mobile rack is also perfect for use with SSD drives in a desktop computer (Solid State Drives) that interface via SATA.