So, this happened to me and while searching on google I found a lot of other people with this problem, it seems that Windows 7 x64 thinks that any user with 4GB of RAM or 8GB of RAM has slightly more than what the user has, so when using external USB HDDs or Wireless cards, it is common for it to freeze anything USB when a file transfer or download is taking place, the only way to unfreeze the USB ports is to restart but it will happen soon again, took me a while to find a fix until Microsoft fixes it, it means sacrificing a bit of RAM but it will solve the problem.
1) From an elevated command prompt (right click on the command prompt shortcut, run as administrator):
2) Type "bcdedit /set truncatememory <hex code>" (no quotes)
3) Reboot.
4) Go to control panel -> System and Security -> view amount of RAM and processor speed.
5) It should report xGB (yGB available) and the problem will no longer happen.
The <hex code> can be calculated by using google, if you have 4GB of RAM and want to truncate it to:
2GB then the hex code is: 0x7FFFFFFF
3GB then the hex code is: 0xBFFFFFFF
3,25GB (the one I'm using) then the hex code is: 0xDFFFFFFF
For people with 8GB of RAM:
5GB then the hex code is: 0x13FFFFFFF
6GB then the hex code is: 0x17FFFFFFF
7GB then the hex code is: 0x1BFFFFFFF
7,25GB then the hex code is: 0x1DFFFFFFF
For any other value of RAM you can type in google: "<value in GB> * 1024^3 - 1 in hexadecimal" and it will give you the hex code you need.
xGB is the real value of the RAM you have, yGB will be the value you truncated it by.
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A fix from Microsoft should be coming soon, when it does you can revert to your normal RAM by doing this:
1) Open an elevated command prompt again:
2) Type "bcdedit /deletevalue truncatememory" (no quotes)
3) Reboot
4) Go to control panel -> System and Security -> view amount of RAM and processor speed.
5) It should report your real RAM.
Hope this helped someone, I was getting pissed because nothing USB would work correctly for about a week now and this problem is old (it was also in the beta but Microsoft hasn't fixed it yet). This solved it for me.
Nice, fixed my USB's!
I haven't encountered any problems like this with my x64 Windows 7, but thanks for the heads-up. This may prove itself useful if I notice this happen. Thank you for the time and effort you put into this tutorial. :h:
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