Welcome to Vista Banter. You are currently viewing our boards as a guest which gives you limited access to view most discussions, articles and access our other FREE features. By joining our free community you will have access to ask questions and reply to others posts, upload your own photos and access many other special features. Registration is fast, simple and absolutely free so please, join our community today! If you have any problems with the registration process or your account login, please contact contact support. |
|
Hardware and Windows Vista Hardware issues in relation to Windows Vista. (microsoft.public.windows.vista.hardware_devices) |
|
LinkBack | Thread Tools | Display Modes |
|
|||
USB Performance and configuration...
I have a Sony Vaio desktop that has 4 USB 2.0 connectors on the back and 2
USB 2.0 connectors on the front. I've noticed that I'm getting nowhere near the 480 mbps throughput of a 2.0 device. In fact, I'm lucky to get more than about 4.5 mbps with 1.5 mbps being fairly common as well. The devices are external USB drives and the performance that I'm referring to is the transfer rate that is reported during a file transfer. I looked at the Device Manager, expecting to see something that looks like 6 USB ports. What I see is: **Universal Serial Bus controllers** - SiS 7001 PCI to USB Open Host Controller (System Reserved 10% bandwidth) - SiS 7001 PCI to USB Open Host Controller (System Reserved 10% bandwidth) - SiS 7001 PCI to USB Open Host Controller (System Reserved 10% bandwidth) - Standard Enhanced PCI to USB Host Controller (System Reserved 20% bandwidth) - USB Mass Storage Device - USB Root Hub (full speed) - USB Root Hub (full speed) - USB Root Hub (full speed) - USB Root Hub (high speed) The only USB device connected at the moment is a 4 gb USB flash drive in one of the two front connectors and configured for use by ReadyBoost. Do any of you folks know: (1) how the devices [in Device Manager] above relate to the physical connectors (4 rear/2 front)? (2) how the bandwidth gets assigned to the host controllers and whether it can be changed or not? (3) why the hubs report less than high speed and whether that can be changed or not? Thanks in advance, Howard |
|
|||
USB Performance and configuration...
Any USB experts out there?
===================================== "Howard Woodard" wrote in message ... I have a Sony Vaio desktop that has 4 USB 2.0 connectors on the back and 2 USB 2.0 connectors on the front. I've noticed that I'm getting nowhere near the 480 mbps throughput of a 2.0 device. In fact, I'm lucky to get more than about 4.5 mbps with 1.5 mbps being fairly common as well. The devices are external USB drives and the performance that I'm referring to is the transfer rate that is reported during a file transfer. I looked at the Device Manager, expecting to see something that looks like 6 USB ports. What I see is: **Universal Serial Bus controllers** - SiS 7001 PCI to USB Open Host Controller (System Reserved 10% bandwidth) - SiS 7001 PCI to USB Open Host Controller (System Reserved 10% bandwidth) - SiS 7001 PCI to USB Open Host Controller (System Reserved 10% bandwidth) - Standard Enhanced PCI to USB Host Controller (System Reserved 20% bandwidth) - USB Mass Storage Device - USB Root Hub (full speed) - USB Root Hub (full speed) - USB Root Hub (full speed) - USB Root Hub (high speed) The only USB device connected at the moment is a 4 gb USB flash drive in one of the two front connectors and configured for use by ReadyBoost. Do any of you folks know: (1) how the devices [in Device Manager] above relate to the physical connectors (4 rear/2 front)? (2) how the bandwidth gets assigned to the host controllers and whether it can be changed or not? (3) why the hubs report less than high speed and whether that can be changed or not? Thanks in advance, Howard |