Syba CL-HD-MRDU25S Dual Bay Trayless Mobile Rack for Two 2.5" SATA III Drive, Black Removable enclosure 3.5 for two 2.5 SATA hard disks Removable internal enclosure 3.5 for two 2.5 SATA hard disks Fits in any 3.5 Floppy bay. Can work in external 3.5" enclosure