By any chance, do you have any antivirus program with File System Realtime Protection? It can cause system crashes during a large file transfer at high speed.
I have had system crashes during file transfer or CD burning. I finally found out the cause. It was File System Realtime Protection of Symantec AntiVirus. Whenever I transfered a large file, my system crashed. It doesn't mean transfer to other computer. They are internal transfers at high speed, ie. moving to other folder or drive, CD burning... . It happened with single files larger than around 450 MB. So I disabled File System Realtime Protection as a try and it worked. I have never got a system crash during file transfers since then.
You should check it if you use some kind of protection. Hope this might help you.
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