Usb hub and external 2.5" storage

I answered myself. I bought a 3A 7-ports usb hub from dlink and all my 4 drives are powered. I don’t know why you turn them off, my drives are powered down anyway when I don’t use them and this way they are visible and accessible via home networking. When I want to copy a file to a drive from my computer, I go there, and there’s a small amount of time for the drive to power on, it copies then it power down when finished.