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Join Date: Aug 2009
Location: Upstate New York, U.S of A.
06-30-2011, 04:52 PM
PS. Welcome to the forum....
iPad 4 (64gb) w/Retina,Targus Versavu Case
Join Date: May 2010
07-01-2011, 04:12 PM
I've measured the voltage of each port, and they have the same voltage (5v dc), they also have the same speed of data transfer.
The power source indeed on the left side (from the user view), but it isn't directly connected to usb ports since it isn't 5v dc, it come to some kind of regulator that divide n regulate the voltage as the need of each part. and also, the distance of the 5v source power to each usb port isn't that long to make any difference in transferring 5v dc.
---------- Post added at 04:12 PM ---------- Previous post was at 04:08 PM ----------
When installing OS X, whichever the usb port I use to connect to my external hdd, it has the same results and time of installation.
Join Date: Nov 2008
Location: New Hampshire
07-01-2011, 06:12 PM
The voltage is the same, as is the data speed. However, the maximum current the ports can supply is different. You will often see device manufacturers recommend connecting devices to the port on the back of a PC and not through a hub or front panel ports for the same issue - some ports can supply more power than others.
The problem usually shows up only with CD/DVD drives. The drive will appear to be powered and may even spin up, but it will not read or write data. These drives often have the ability to supply extra power from an external power supply or a second USB port. Some full-size USB disk drives (not the 2.5" or smaller drives) have the same issue, though they tend to be more forgiving.
On the Mini 9, the port closest to the power jack can deliver the most current, though even it can't quite manage the full 500ma the USB spec calls for. The other ports are weaker in current delivery.
Mini 9|2GB RAM|64GB RunCore|Intel 5300|Windows 10
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