Windows 10 the semaphore timeout period has expired [121] windows 10

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radar1954

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I am trying to copy large .pst files (3 Gb to 7 Gb in size) from an external 2TB ioSafe drive (USB 2.0) to an internal hard drive (2TB WD Black) on my newly "upgraded" Windows 10 x64 desktop PC. Both hard drives have at least 50% free space. The problem is I keep getting this error: "the semaphore timeout period has expired [121]".This only happens when copying multi GB size files - smaller files, in the 50 MB range copy just fine. The external drive is directly connected to my PC via USB 2.0 and is NOT on a network.

thanks for the help.

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