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B450 USB data transfer speed slow or erratic


Have Lenovo B450 for about 12 months.  Recently connecting 2 external 2T hard drives via USB.

When I transfer files between them using a sync program or other programs - transfer speed is very erratic.  Sometimes will run at 18+MByte per second, then next transfer (did not shut down program) will quickly slow to less than 2MB/s? Why is the Performance is random?

I am running XP SP3 Professional. The same setup (and OS) with my desktop PC gets consistently fast (18MB/s) USB transfers between the drives?



A workaround to Run in SAFE MODE, do the file transfers as per normal seems to work - I found the speed was consistently faster at about 25MB/s using the same sync program.


It would seem that some process running in normal mode is interfering with USB file transfer speeds.  Could be antivirus checking files on the fly or something else.  I could use msconfig.exe to selectively disable different start up tasks to help track down which application / utlitity might be impacting performance. 

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