<P> If subsequently F needs to be expanded, since the space immediately following it is occupied, there are three options for the file system: </P> <Ol> <Li> Adding a new block somewhere else and indicating that F has a second extent </Li> <Li> Moving files in the way of the expansion elsewhere, to allow F to remain contiguous </Li> <Li> Moving file F so it can be one contiguous file of the new, larger size </Li> </Ol> <Li> Adding a new block somewhere else and indicating that F has a second extent </Li> <Li> Moving files in the way of the expansion elsewhere, to allow F to remain contiguous </Li>

When all the contents of a file are truncated this means that