Copying Files Fails With "Parameter Is Incorrect"

When copying, moving, or synchronizing files, Beyond Compare gives the error message "The parameter is incorrect".

This error is usually displayed when copying a file larger than 4 GB in size to a target drive that uses the Fat32 file system.  The Fat32 file system's maximum supported file size is 4 GB.  Files larger than this will fail to copy with the "parameter is incorrect" error.

A solution is to reformat the drive using the NTFS file system, which supports larger file sizes.  Note that reformatting will remove all data from the drive.  To reformat a drive, right click on it in Windows Explorer and select "Format".  In the Format dialog, make sure NTFS is selected as the file system type.

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