'Overlay' in terms of Live CD

[Rahul Sundaram]

Anne Wilson wrote:
> Can someone please give me a quick definition of 'overlay' in terms of a 
> live-CD?  I find lots of mentions by googling, but nothing that helps me get 
> to grips with it.  I need to know whether I should set a large overlay if I 
> build from a KDE 4.0 Live CD with the intention of updating to KDE 4.1.

Overlay in simple terms is a additional storage layer. Everything that 
you do as an update is stored in this overlay and more you do updates 
and the larger they are, the larger your overlay size should be.

Rahul