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![figure177](img8.gif)
Figure 6: Index Blocks
- After first file access - the index block can be kept in memory
- Good for random access
- A whole index block at a time must be allocated even for small files
large disk space overheads than for previous schemes
- Difficult to insert or delete blocks
an example of a unix directory structure (with symbolic link)
-rw-r--r-- 1 ofr 1902 Sep 6 1995 Nn_Code
-rw-r--r-- 1 ofr 1780 Jul 9 1996 PVM_vs_MPI
lrwxrwxrwx 1 root 27 Sep 6 1995 PetriNets -> /usr/local/petrinets/
drwxr-xr-x 2 ofr 512 Oct 26 14:52 Pmosaic
Omer F Rana
Sat Feb 15 19:06:41 GMT 1997