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.
fsutil file createnew D:\testfile_50GB.bin 53687091200 50 GB = 50 × 1024³ bytes = Or use PowerShell: 50 gb test file
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; yes "This is a 50 GB test file line