I really hope title is specific enough.
What I am trying to achieve is that using a SATA Extension Cable to PS4 you can plug in a 15mm 2.5" Laptop Drive or 3.5" Desktop Drive and the issue is that the internal SATA connection provides no 12v for 3.5" HDDs so 3.5" HDDs that require the 12V will not spin up due to inadequate power. I have a 430W PSU lying around and have it set up so that it provides SATA power of 12V and 5V DC to the HDD and just have the SATA III data connected to PS4. But for this I ALWAYS need to make sure I turn on the HDD power before the PS4 or the PS4 will spend a minute trying to boot and then warn of "Cannot Connect to Storage". Is there a way to connect the 5V from PS4 to PS_ON so that when the PS4 boots and attempts to power on the internal drive it switches on the PSU via the PS_ON + GND bridge causing the HDD to be adequately powered and everything flows nicely. During PS4 shutdown, the last thing to lose power is the HDD, thus turning off the PSU.
Is this possible?