On 2011-08-22 at 21:12 Pablo said:

> In other words, the .vdi file is one of the VM's disk drives.  If the
> its disk drive increases in space, you need to tell the Guest O/S
> there's more total (also important) space available.

  Thanks, Pablo - you've helped me see what I had wrongly assumed!

I don't remember telling the guest O/S (WinXP) anything about the drive 
size when I defined the WinXP VM several years ago, only that I defined 
the size for VBox to use.
  I had therefore assumed that if I ask VBox to increase the size of the 
.vdi, then that larger size would automagically be picked up by the 
guest WinXP!
  (Yes, at 78 one can still believe in fairies... :-) )
  
So, as I now understand it, after getting VBox to increase the size of 
the .vdi, I need to do the equivalent of running  e.g. Gparted from a 
Live DVD to alter the partition structure of a Linux installation (which 
I have done several times in the past).
  (I also used PartitionMagic in my OS/2 (WARP) pre-Linux days.)

What I still can't get my head round is how to get VBox to start up the 
VM but passing action to a Live DVD instead of booting the guest WinXP, 
and at first glance there is nothing about that at:

    http://www.theeldergeek.com/hard_drives_05.htm 

A possible problem inside the guest WinXP is that - a well as the C: 
disk - there is a small D: disk containing some VBox extension data, 
making it difficult to extend C:.

It's beginning to look as though the only sure way of having a larger 
drive would be to ditch the current VM, make a new, larger, one, and re-
install WinXP all over again.   Yuch!

-- 
/\/\aurice

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