The tests of the file system will assume the following sizes of the 
disk and the internal data structures:

Disk: 4 cylinders, 2 surfaces, 8 sectors/track, 64 Bytes/sector

File name: maximum of 4 characters, no extension

Number of files: not more than 10

Number of open files: 3 plus the directory, i.e., the size of the OFT
is exactly 4 entries. (The directory should be opened automatically
when the file system starts and remain open until the file system is
shut down.)