cat Bigfile.000 Bigfile.001 Bigfile.002 > combined_output.bin
If all else fails and the file is not critical: Unable To Open Bigfile Bigfile.000
If you have a .vmdk that consists of multiple .vmdk data files (e.g., disk.vmdk, disk-s001.vmdk), the error "Unable to open bigfile" may be aliased. Fix: Ensure the descriptor .vmdk file is present, not just the data segments. cat Bigfile
Also, close any other program that might have locked the file (e.g., backup software, indexing service, or another forensic tool). Identify file type: