[TriLUG] why does usb card on PCIe bus need extra power to detect a disk?

[Brian via TriLUG]

On 12/13/18 5:52 PM, Joseph Mack NA3T via TriLUG wrote:
> I don't know where you'd have 
> type A male usb connectors inside a computer.

I have one of those multifunction front-panel doohickeys that goes in a 
5.25" bay.  It has audio jacks, various memory card readers, and USB 
ports.  It has a USB type A male inside the case for the readers and 
ports.  It's not that uncommon to see a mobo or PCIe USB adapter with 
type-A female ports inside the case.  Here's one example.

https://www.newegg.com/Product/Product.aspx?Item=N82E16815287016