ufs storage blocks

The rest of the space allocated to the filesystem is occupied by storage blocks, also called data blocks. The size of these storage blocks is determined at the time a filesystem is created and can be 2048, 4096, or 8192 bytes. Because of these large block sizes and the potential for waste with small files, ufs also has a subdivision of a block called a ``fragment''. When a filesystem is created, the fragment size must match or be smaller than the block size: you can set it to 512, 1024, 2048, or 4096 bytes. Fragments of 1024 bytes are the most commonly employed. For a regular file, the storage blocks contain the contents of the file. For a directory, the storage blocks contain entries that give the inode number and the filename. ufs filenames can be up to 255 bytes long. Each entry represents a file or subdirectory that is a member of the directory.