FileFiller is an application which lets you Create dummy files at (almost) any size. The file's contents can be pseudorandom, filled with zeros or with characters you specify. The program supports FAT12/16/32 and NTFS filesystems; files created in a FAT-formatted volume can be created with a maximum size of 4GB, and for NTFS up to 80 GB. To speed up the process and to allocate the memory efficiently, use the "Gigabytes" option to create huge files. No installation required!