Preventing Windows from automatically powering down a USB port
- de Joe W4TV
Open the Windows Control Panel (WCP)
Open the Device Manager
in Windows XP, run the WCP's System applet and then click the Device Manager button on the System Properties window's Hardware tab
in Vista, run the WCP's System and Maintenance applet and then click the System link in the System and Maintenance window, and then click the Device Manager link on the left side of the System window
in Windows 7, run the WCP's System and Security applet and then click the Device Manager link in the System section
Expand the Universal Serial Bus Controllers entry; for each USB Root Hub and Generic USB Hub in the expanded list,
Open the Power Management tab
Uncheck the Allow Windows to turn off this device to save power
Some of Windows' power saving features may degrade USB port performance. Run the Power Options applet in the Windows Control Panel and
- configure a power plan optimized for performance
- disable automatic hibernation and sleep options
- on Vista and Windows 7
follow the Change Plan Settings link to the Edit Plan Settings window
follow the Change Advanced Power Settings link to the the Advanced Power Settings window
expand the USB Settings entry
disable the USB selective suspend setting entry's On battery and Plugged in settings