Re: front USB ports
- From: "Rod Speed" <rod.speed.aaa@xxxxxxxxx>
- Date: Sat, 2 Sep 2006 15:17:34 +1000
nospam <nospam@xxxxxxxxxxx> wrote:
The ports came with the case. I have just re-checked the connections
and all seems ok in that area. When I use my 1gig USB key there are
no problems. However,
I just tried the external drive and, although it is recognised by the
PC, takes an abnormally long time to to configure itself. during the
recognition process. It is as if it is running at USB1 speeds.
You'll probably find that it cant deliver the full 5V
to the drive at the current those drives need.
have just tried the front ports with a powered USB external drive and it
functions ok (i.e at the expected USB2 speeds for file transfers). It seems
that the ports are not capable of providing enough power to the un-powered
external drive.
Yep, and that isnt that unusual with the front USB ports that come with cases.
If that is the case, why can the ports on the rear of the motherboard can
power the unpowered external drive and the internal ports cannot?
Most likely the pcb traces on the pcb that has the front USB ports
soldered to it are too thin and so it cant deliver the full 500mA
that the port is supposed to be able to supply without a significant
sag in the 5V line in the USB port. Or that unpowered case actually
needs more than the 500mA specified, and the rear ports can do that.
Quite a few of those unpowered cases take more than 500mA and
some come with a second USB cable so you can get power from
more than one USB port to be able to supply that.
Thanks for the feedback.
No problem, thats what these technical groups are about.
"Rod Speed" <rod.speed.aaa@xxxxxxxxx> wrote in message
news:4lsff9F3ejfuU1@xxxxxxxxxxxxxxxxx
nospam <nospam@xxxxxxxxxxx> wrote
I have an Asus M2NPV-VM motherboard:
http://www.asus.com/products4.aspx?l1=3&l2=101&l3=0&model=1138&modelmenu=1
I have installed 2 X 1gig sticks of DDR2 ram and an AMD 2X 3800 CPU
plus 1 X DVDRW drive and 1 X 320gig WD SATA2 drive. I am using the
onboard video and sound as well as have all the USB and Firewire
ports enabled. I do not have anyother devices in the machine. The
machine also has a 500w PSU.
Where did the front usb ports come from ? Did they come with the
case ?
My problem is with the front USB ports on my case. When I run a
memory stick from them there are no problems, however, when I try
and connect a 120gig Samsung 2.5" drive in an unpowered external
case, the speed of file transfers drop to almost zero. (definately
not USB2 speeds). Thinking that it may be a power problem, I
plugged this external drive into the motherboard's rear USB ports
and it runs at the expected USB2 speed without a hitch. I have
checked to ensure that the PC case's front USB port connectors are
correctly plugged into the motherboard's internal USB2 connectors.
Is there anything I can do to fix the front USB ports??
Check that you have got them plugged into the motherboard header
properly, using the correct pins. Try a better set of front usb
ports.
.
- References:
- front USB ports
- From: nospam
- Re: front USB ports
- From: Rod Speed
- Re: front USB ports
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- front USB ports
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