Transfer speed over USB 2.0

  • Thread starter Thread starter Bishoop
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Bishoop

I'm trying an external HDD (WD400BB) installed in an ADI enclosure with USB
2.0 to IDE interface.

I started a backup using the backup utility in WinXP and after two minutes
only about 90MB had be transferred. The guestimate for the remaining 21GB
was something in excess of 7 hours.

Is this the performance to be expected with this configuration?

Thanks....
 
But are ALL the USB ports on your system USB2 capable, or more importantly,
High Speed USB capable? You know, they've changed the spec of USB2 so that
USB1.1 ports can be called USB2, but still operate at the slower 11Mbps
speed. You have to look for the High Speed USB indication now.

Does the ADI enclosure specify the transfer speed capable with the device?
 
Guess Who said:
But are ALL the USB ports on your system USB2 capable, or more
importantly, High Speed USB capable? You know, they've changed
the spec of USB2 so that USB1.1 ports can be called USB2, but
still operate at the slower 11Mbps speed. You have to look for
the High Speed USB indication now.

Does the ADI enclosure specify the transfer speed capable with
the device?
Click to expand...


Have been hearing how some devices are advertised as "USB 2 capable"
when what they really mean is that they are USB 1.1 and they will
work with other USB 2 devices because the other USB 2 device will
fall back to USB 1.1 speeds. What a misleading claim! But seems it
is happening.
 
| But are ALL the USB ports on your system USB2 capable, or more
importantly,
| High Speed USB capable? You know, they've changed the spec of USB2 so
that
| USB1.1 ports can be called USB2, but still operate at the slower 11Mbps
| speed. You have to look for the High Speed USB indication now.
|
| Does the ADI enclosure specify the transfer speed capable with the device?
|
|
| | >
| > | > | On Fri, 29 Aug 2003 19:23:36 -0400, "Bishoop" <[email protected]>
| > | scribbled:
| > |
| > | >I'm trying an external HDD (WD400BB) installed in an ADI enclosure
with
| > USB
| > | >2.0 to IDE interface.
| > | >
| > | >I started a backup using the backup utility in WinXP and after two
| > minutes
| > | >only about 90MB had be transferred. The guestimate for the remaining
| > 21GB
| > | >was something in excess of 7 hours.
| > | >
| > | >Is this the performance to be expected with this configuration?
| > | >
| > | >Thanks....
| > |
| > | It sounds like it's operating in USB 1.1 mode - 90MB in two minutes is
| > | about 750KB/s, which is in line with USB 1.1 speed. Make sure it's
| > | connected to a USB 2.0 enabled port, and make sure you have any
| > | required USB drivers installed, BIOS support enabled, etc...
| > |
| > | -Slash
| > | --
| > | "Ebert Victorious"
| > | -The Onion
| >
| > USB 2.0 appears to be enabled on my system. In Device Manager under the
| > Universal Serial Bus controllers section; VIA USB 2.0 Enhanced Host
| > Controller. The driver files listed for this entry are Microsoft file
| > versions 5.1.2600.1106 (xpsp 1.020828-1920).
| >
| > Is there any other way to confirm USB 2.0 operation?

I'm quite confident that the Soyo KT-400 motherboard is the "real" USB 2
compliant.
 
Open Device manager and Select View->Devices By Connection. Make sure your
device is connected to a EHCI USB host, not to an UHCI or OHCI.

When you connect an USB device to the system, it gets routed to either USB
2.0 EHCI controller, which supports 480 Mb/s, or to a satellite UHCI/OHCI,
which only give 12 Mb/s, depending on what the device tells about itself.
 
| Open Device manager and Select View->Devices By Connection. Make sure your
| device is connected to a EHCI USB host, not to an UHCI or OHCI.
|
| When you connect an USB device to the system, it gets routed to either USB
| 2.0 EHCI controller, which supports 480 Mb/s, or to a satellite UHCI/OHCI,
| which only give 12 Mb/s, depending on what the device tells about itself.
|
| | >
| >
| > USB 2.0 appears to be enabled on my system. In Device Manager under the
| > Universal Serial Bus controllers section; VIA USB 2.0 Enhanced Host
| > Controller. The driver files listed for this entry are Microsoft file
| > versions 5.1.2600.1106 (xpsp 1.020828-1920).
| >
| > Is there any other way to confirm USB 2.0 operation?
| >

Thanks for telling me where to look.

What I've found makes me think the external drive is NOT running under USB
2.0

In Device Manager the drive is found at:

VIA Rev 5 or later USB Universal Host Controller > USB Root Hub > USB Mass
Storage Device > WDC WD400BB-75CLB0 USB Device.

The only other USB 2.O device I have is my Epson scanner and its path is:

VIA USB 2.0 Enhanced Host Controller > USB Root Hub > Epson Perfection 1660

If correctly installed would the harddrive show as:

VIA USB 2.0 Enhanced Host Controller > USB Root Hub > WDC WD400BB-75CLB0 USB
Device.

Assuming I haven't been scammed and the device is truly USB 2.0 compliant,
as their literature claims, is there some way I can force it to use the 2.0
drivers?

Thanks for your help.....
 
| Open Device manager and Select View->Devices By Connection. Make sure your
| device is connected to a EHCI USB host, not to an UHCI or OHCI.
|
| When you connect an USB device to the system, it gets routed to either USB
| 2.0 EHCI controller, which supports 480 Mb/s, or to a satellite UHCI/OHCI,
| which only give 12 Mb/s, depending on what the device tells about itself.
|
| | >
| >
| > USB 2.0 appears to be enabled on my system. In Device Manager under the
| > Universal Serial Bus controllers section; VIA USB 2.0 Enhanced Host
| > Controller. The driver files listed for this entry are Microsoft file
| > versions 5.1.2600.1106 (xpsp 1.020828-1920).
| >
| > Is there any other way to confirm USB 2.0 operation?

Apparently all the ports on my Soyo KT-400 motherboard are not USB 2.0
compliant. I plugged the drive into the same port where the scanner is and
away it went. Now the transfer speeds are equivalent to what I see drive to
drive in the machine.

Now to figure out why all the Soyo USB ports are not USB 2.0.

Thanks for setting me on the right track......
 
| Open Device manager and Select View->Devices By Connection. Make sure your
| device is connected to a EHCI USB host, not to an UHCI or OHCI.
|
| When you connect an USB device to the system, it gets routed to either USB
| 2.0 EHCI controller, which supports 480 Mb/s, or to a satellite UHCI/OHCI,
| which only give 12 Mb/s, depending on what the device tells about itself.
|
| | >
| >
| > USB 2.0 appears to be enabled on my system. In Device Manager under the
| > Universal Serial Bus controllers section; VIA USB 2.0 Enhanced Host
| > Controller. The driver files listed for this entry are Microsoft file
| > versions 5.1.2600.1106 (xpsp 1.020828-1920).
| >
| > Is there any other way to confirm USB 2.0 operation?

The first port I was trying to use is connected to the motherboard by a 36",
flat, unshielded cable. Apparently that type cable will not allow USB 2.0
operation. I checked the motherboard USB port with a shorter, shielded
cable and all is well.

Thanks again....
 
Flat unshielded cable is not even USB 1.1 compliant. There are some USB 1.1
devices which would choke on that configuration.
 
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