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If the File format system of your Drive is FAT32 means, you cannot paste a single file having file size of 4gb.
For pasting single file of 4 GB size you need that partition to be in NTFS file format system!http://support.microsoft.com/kb/314463
Check the last point in the information!You cannot create a file larger than (2^32)-1 bytes (this is one byte less than 4 GB) on a FAT32 partition.
thanks dear .... this solve my problem... thanks a lot .. best of luck