Old USB Query

  • Thread starter Thread starter Mafooouk
  • Start date Start date
M

Mafooouk

Hey, im having problems with my USB on my PC. Below is
the transcript of the chats ive had on here before, i
have fitted the 550W PSU As suggested and it's made no
improvements... Any other Suggestions?

Thanks

Matthew

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///////////////// Original Message(s) \\\\\\\\\\\\\\\\\\\\
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Subject: Re: USB Devices... Not Installing
From: "Jim H" <[email protected]>
Sent: 3/30/2004 5:10:28 PM




Cari more then likely is correct. USB devices power each
item through the USB Cable. Each device therefore
becomes
a power drain on the power supply. If the cables, ports
etc are not being powered properly they won't work and
windows may have trouble recognizing them.

USB devices are capable of supporting up to 127 devices
daisey chained together, so you shouldn't have to
reformat
each time you want to move or install another device.
They
are suppose to be "hot swappable" also however, it's a
good idea to "eject" the device prior to disconnecting it.
This is done with the usb icon located in the sys tray
in the bottom right corner of your screen near the clock.
 
If you review your USB Root Hub properties in Device Manager you will find that it generally requires only 2 milli-amps

A few USB myths explained
Yes USB can support over 100 devices 'daisey-chained' but I have yet to find ONE device that has the ability to plug another into it: thus the fist link in the chain is the LAST
The best example of chaining is the Microsoft USB Keyboard that allows for 2 additional devices to be connected - very useful to plug a mouse into and keep its cable close to the desktop [finally catching up to Apple's idea].

If you have a requirement for more than 2 USB devices [I have more than 6] get a Powered USB HUB that sits on your desktop.

The use of a HUB is more practical for most people and also facilitates the installation and removal of items such as your Digital Camera, USB Memory Stick and such like. It is also cheaper than a new Power Supply and easier by far to install

Given that your hardware configuration includes a 300W power supply: this should be more than adequate. Do of course review the 5V power specifications [as used by the PCI USB Cards], just to confirm that there is adequate output at that voltage

I am confident that if your power supply was straining to meet the power demands of your devices, then you would find the system crashing as the memory and CPU would be running out of power also. I don not read this in your post.
 
USB can supply .5 amps to each device but the port is
limited in power output. That is why devices that require
full power also need a powered hub when you start to
daisy-chain.


| If you review your USB Root Hub properties in Device
Manager you will find that it generally requires only 2
milli-amps.
|
| A few USB myths explained:
| Yes USB can support over 100 devices 'daisey-chained' but
I have yet to find ONE device that has the ability to plug
another into it: thus the fist link in the chain is the
LAST.
| The best example of chaining is the Microsoft USB Keyboard
that allows for 2 additional devices to be connected - very
useful to plug a mouse into and keep its cable close to the
desktop [finally catching up to Apple's idea].
|
|
| If you have a requirement for more than 2 USB devices [I
have more than 6] get a Powered USB HUB that sits on your
desktop.
|
| The use of a HUB is more practical for most people and
also facilitates the installation and removal of items such
as your Digital Camera, USB Memory Stick and such like. It
is also cheaper than a new Power Supply and easier by far to
install.
|
| Given that your hardware configuration includes a 300W
power supply: this should be more than adequate. Do of
course review the 5V power specifications [as used by the
PCI USB Cards], just to confirm that there is adequate
output at that voltage.
|
| I am confident that if your power supply was straining to
meet the power demands of your devices, then you would find
the system crashing as the memory and CPU would be running
out of power also. I don not read this in your post.
 
Hmm so these USB PCI Cards are no good whatsoever? ive
already installed the new PSU, at a cost of £30. the PC
spec is now 550W and the pc has never crashed in its
lifetime. I really need this problem sorted, i am coming
into some money shortly, would your ecommend a new
Motherboard with say 6 onboard USB Ports?

Matthew
-----Original Message-----
USB can supply .5 amps to each device but the port is
limited in power output. That is why devices that require
full power also need a powered hub when you start to
daisy-chain.


news:8CC82F14-E112-4200-BEAA-
Click to expand...
(e-mail address removed)...
| If you review your USB Root Hub properties in Device
Manager you will find that it generally requires only 2
milli-amps.
|
| A few USB myths explained:
| Yes USB can support over 100 devices 'daisey-chained' but
I have yet to find ONE device that has the ability to plug
another into it: thus the fist link in the chain is the
LAST.
| The best example of chaining is the Microsoft USB Keyboard
that allows for 2 additional devices to be connected - very
useful to plug a mouse into and keep its cable close to the
desktop [finally catching up to Apple's idea].
|
|
| If you have a requirement for more than 2 USB devices [I
have more than 6] get a Powered USB HUB that sits on your
desktop.
|
| The use of a HUB is more practical for most people and
also facilitates the installation and removal of items such
as your Digital Camera, USB Memory Stick and such like. It
is also cheaper than a new Power Supply and easier by far to
install.
|
| Given that your hardware configuration includes a 300W
power supply: this should be more than adequate. Do of
course review the 5V power specifications [as used by the
PCI USB Cards], just to confirm that there is adequate
output at that voltage.
|
| I am confident that if your power supply was straining to
meet the power demands of your devices, then you would find
the system crashing as the memory and CPU would be running
out of power also. I don not read this in your post.


.
Click to expand...
 
The only problem with any USB port is that they are limited
in power output. The USB devices are powered by the port.
Some devices use very little power, such as a mouse and
others may use more power, such as a scanner.

Having USB 2.0 on the motherboard means that the driver will
be in the BIOS firmware and available to use before the OS
boots. Certainly any USB ports are useful but ports on the
mobo have advantages. The specification for USB limits
power output at each port. The limit is important if you
are daisy-chaining or add port by the use of an unpowered
hub.

If buying a new computer or mobo, I would get 6 or more USB
2.0 ports and maybe Firewire ports too.

My current mobo (Intel D845GBVL) has 6 USB 2.0 ports and I
have added a PCI Firewire card. Add-in USB and Firewire
cards might have a direct power connector directly to the
card from the power supply.

Newer mobo have 8 I think. I would look for ports on the
rear and internal ports and headers for front panel
connections to match the case and any card readers that
might be installed.



Hmm so these USB PCI Cards are no good whatsoever? ive
already installed the new PSU, at a cost of £30. the PC
spec is now 550W and the pc has never crashed in its
lifetime. I really need this problem sorted, i am coming
into some money shortly, would your ecommend a new
Motherboard with say 6 onboard USB Ports?

Matthew
-----Original Message-----
USB can supply .5 amps to each device but the port is
limited in power output. That is why devices that require
full power also need a powered hub when you start to
daisy-chain.


news:8CC82F14-E112-4200-BEAA-
Click to expand...
(e-mail address removed)...
| If you review your USB Root Hub properties in Device
Manager you will find that it generally requires only 2
milli-amps.
|
| A few USB myths explained:
| Yes USB can support over 100 devices 'daisey-chained' but
I have yet to find ONE device that has the ability to plug
another into it: thus the fist link in the chain is the
LAST.
| The best example of chaining is the Microsoft USB Keyboard
that allows for 2 additional devices to be connected - very
useful to plug a mouse into and keep its cable close to the
desktop [finally catching up to Apple's idea].
|
|
| If you have a requirement for more than 2 USB devices [I
have more than 6] get a Powered USB HUB that sits on your
desktop.
|
| The use of a HUB is more practical for most people and
also facilitates the installation and removal of items such
as your Digital Camera, USB Memory Stick and such like. It
is also cheaper than a new Power Supply and easier by far to
install.
|
| Given that your hardware configuration includes a 300W
power supply: this should be more than adequate. Do of
course review the 5V power specifications [as used by the
PCI USB Cards], just to confirm that there is adequate
output at that voltage.
|
| I am confident that if your power supply was straining to
meet the power demands of your devices, then you would find
the system crashing as the memory and CPU would be running
out of power also. I don not read this in your post.


.
Click to expand...
 
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