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18:07, 23 February 2010 well, dust covers are useless as the CPC lacks mechanical cooling system (ventilator) yet there are still some utility for this.
The drives (Cassettes or Disk) actually have mechanical parts that don't like dust that well. We all know magnetic tape/floppy hate dust.
Also, the key board may house dust that would turn into Plushes with time and quantity. As a result part of the keys may not work at all, I've seen that, as i had to remove large quantities of plushes from the keyboard of my cpc6128 to get it worjk entirely.
Also plushes of dusts may act as thermic isolant/insulant (what is the word ?), so some electronic components may heat a bit more is covered by dust.
But of course a good CP user has to open his beloved machine sometime to remove the dust. It just a good excuse to open it to look at the marvelous design of the awesome motherboard.
Yet remember that at the time (80's) you couldn't open your computer if you wanted it to remain warranted. ^^ --[[User:MacDeath|MacDeath]] 18:07, 23 February 2010 (UTC)