Macbook pro i7 and external PC Harddisk


i have question experienced mac users. first time mac user , switched pc mac. experienced freezes in iphoto , yesterday while transfering videos. freezes happend while external pc harddisk plugged in during transfered files mac. far when used macbook pro i7 without pc harddisk plugged in had absolutely no freezes. not going use external pc harddisk anymore after transfered files think macbook pro should fine. or think macbook pro has problem? can happen experience freezes pc stuff? not using bootcamp maybe once want to. under windows happen same thing freezes? should return mac or let be?
 

i'm shooting in dark here, since it's simple, mind disabling automatic graphics switching in system preferences , performing same activity causes freezes?
 


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