Your Passport drive is formatted using FAT32 file system. On FAT32 partition you cannot copy anything over 4.0 GB.
If you want to copy files above 4.0GB in size, you need to have NTFS file system. If you are willing to do this, you need to copy all of the files residing in your portable to another location. (Drive Backup)
Then follow these instructions to repartition and format your drive using NTFS.
Partition & Format Drives
Mabikay – SLK
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