fallocate -l 50G testfile_50GB.bin Python (cross-platform) import os filename = "testfile_50GB.bin" size = 50 * 1024**3 # 50 GB in bytes
$size = 50GB $file = "C:\testfile_50GB.bin" $stream = [System.IO.File]::OpenWrite($file) $stream.SetLength($size) $stream.Close() Using dd (creates a 50 GB file of zero bytes): 50 gb test file
yes "This is a 50 GB test file line." | head -c 50G > testfile_50GB.txt But that is impractical and rarely useful for technical testing. fallocate -l 50G testfile_50GB
with open(filename, "wb") as f: f.seek(size - 1) f.write(b"\0") print(f"Created filename of size os.path.getsize(filename) bytes") This writes a sparse file instantly. For fully populated data, write in chunks. #include <stdio.h> #include <stdlib.h> int main() FILE *f = fopen("testfile_50GB.bin", "wb"); fseek(f, 53687091200L - 1, SEEK_SET); fputc(0, f); fclose(f); return 0; #include <stdio
fsutil file createnew D:\testfile_50GB.bin 53687091200 50 GB = 50 × 1024³ bytes = Or use PowerShell:
Creating a full "50 GB test file" is not about writing text content (that would be billions of pages), but about for testing purposes (e.g., network speed, storage limits, or application behavior).