ORICO HD-PW6101 switch controller 5.25" CD-ROM space 6pcs HDD power switcher moudle (6xswitch(black)) Control and switch the power of internal SATA HDD/ODD separately, connect up to 4 X SATA HDD at the same time Standard floppy drive size, easy to install you can install different operating system on your computer Power off the HDD which is not in use to protect hard drive and it will prolong the HDD life HDD working status LED indicator