Using Windows 8.1 and copying large files over USB 3.0 to Segate hard drive -  I get the following error:-

Error 0x80070079: The semaphore timeout period has expired

 Using Windows 8.1 with a 3 - 4TB USB Segate drive that is using Microsoft's bitlocker.    It seems I can copy small files w/out issues; however, copying large files and directories causes this error.  Connectivity is USB 3.0 from a Dell Latitue3 e6520 to Segagate drive. 

Can anyone share fix or determine methodology to fix?

Joe

Most of those errors I have seen were related to malware/firewall apps and not in win 8.1  I suspect this is a generic timeout error and bitlocker may be slowing the transfer down to where it times out.  It is an extremely rare error (only 2000 hits in Google)

Thanks for your prompt response!   I had not experienced this before on any unbitlocked drives using Win7 or Win8 and  I agree that is appears to have something to do with bitlocker. When the error starts it will also continually prompt  for the bitlocker password.  At this point, I would not recommend that anyone uses bitlocker needing to transfer large files to external devices. 

Joe

IMHO I would not use bitlocker period.  I have seen far too many times when something corrupted the password file rendering the entire drive useless.  At the very least I would back up everything and frequently.

Hi Joe,

Was the error gone when you turned off the Bitlocker from this drive?

If no, please refer to this similar thread's solution to resolve:

https://social.technet.microsoft.com/Forums/windows/en-US/c3fc9f5d-c073-4a9f-bb3d-b7bb8f893f78/error-0x80070079-the-semaphore-timeout-period-has-expired?forum=itprovistanetworking