If your Windows 7 or Windows Server 2008 R2 consistently freeze or crash when copy files to USB hard disk or USB flash drive, download and apply the latest Microsoft Hotfix filed under article ID 976972 might be the solution. However, this KB976972 hotfix only applicable to computer that uses:
- Running Windows 7 or Windows Server 2008 R2.
- Has an NVIDIA USB Enhanced Host Controller Interface (EHCI) chipset.
- Has at least 4GB of RAM.
An error may occur when user tries to copy data from the computer to an external USB storage device.
When copying data or files and folders from PC to an USB storage devices such as USB flash drive, portable hard disk drive, or any USB devices, the copy operating may stop without completing or before done copying, or worse, the computer may stop responding. The issue may occur if there is any input/output (I/O) operations on the USB storage device, where the I/O operations fail.
Microsoft has identified that problem in KB976972, and has released hotfix to resolve the issue, which can be downloaded for free from Microsoft Download Center.