Power Supply for 2 HDD
So basically I want a different OS in each HDD. I was wondering how much I need of a power supply because I have no way of supplying the 2nd HDD in terms of cables, btw the one I have is 500W.
What PSU do you have? It's very unlikely there isn't another SATA power cable available unless it's a very low-quality PSU. If you really don't have any more SATA power cables available you can use a splitter like was mentioned above. One of these would work.
Or this to split a molex power connector to two SATA connectors.