On 02/06/17 17:07, Rick Stevens wrote:
Perhaps this will help: USB1.1 and USB2 type "A" connectors have four
pins on the connector--all located on the little "shelf" inside the
connector. USB3 has nine pins--four on the little shelf (for
compatibility with USB1.1 and USB2) and five on the top of the "open"
part of the connector (the USB3-specific pins).
The shelf of your USB2 cable must fit between the shelf and the other
five pins of your computer's connector. USB3 connectors typically have
a thinner shelf than USB2 connectors (with pins on both sides of the
shelf to make contact with all 9 pins). That's probably where the
"tightness" you've felt when using a USB2 cable or device comes from
(stuffing the thicker shelf of USB2 into that space).
Using a USB2 cable in a USB3 connector won't hurt things (those five
extra pins in USB3 will flex back and forth), but the tension those
other five pins have in the USB3 connector may "cock" the USB2 cable so
it doesn't make reliable contact with the USB3 "shelf". Here's a good
picture that may make it clearer and you can see where the USB2 "shelf"
has to fit:
http://pinoutguide.com/Slots/usb_3_0_connector_pinout.shtml
I use USB2 cables and such on my USB3 slots a lot. Yes, I've had the
occasional "gee, the USB3 doesn't see that device", but a reinsertion
or "wiggle" of the USB2 part of things generally fixes it.
YMMV
----------------------------------------------------------------------
- Rick Stevens,
Ok, that helps to explain things and why
I was trying to decide which way to
insert a plug into the USB3 jack, but
now I am looking into the male plugs on
a usb 2 and a usb3 flash drive and both
appear to have the same four pin
connector? I've had the USB3 flash drive
a while so there may have been a change
in the convention?
--
Bob Goodwin - Zuni, Virginia, USA
http://www.qrz.com/db/W2BOD
box10 FEDORA-25/64bit LINUX XFCE Fastmail POP3
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