83. Can't-extend errors
    ~~~~~~~~~~~~~~~~~~~
The annoying message "Can't extend" is sometimes issued by the DFS when
replacing an existing file with a longer version of the same name. This is
because the file is 'sandwiched' in by others on the disc, and can't 'grow'
any further. You can often overcome this by using *DELETE to remove the
existing file, and then Saving the new version. The reason for this is that
the DFS now puts the file after all the others on the disc, instead of trying
to put in back in the original 'slot'. However, if you get the message "Disc
full", you will have to save the file on a spare disc, *COMPACT the original
one, and then try and fit the file back on with *COPY. Yes, the Beeb DFS
really is rather thick I'm afraid; intelligent DFS's take care of all this
disc 'Housekeeping' automatically.