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The decoration, modification, or mutilation of a computer case.

Modifications to computer cases are done for many reasons, ranging from 'geek vanity' to improving internal airflow. They can be as simple as a coat of black paint on the outside or as complex as replacing both sides with plexiglass, adding some sort of illumination inside, and adding several 120mm fans.

Also called a case mod, it usually generates near instant respect at a lan party and can be quite a nice touch to your interior decorating. Case mods can actually be quite functional in some situations, allowing the user to use the case in environments it wasn't intended for or improving cooling so they can reach the next highest bus speed on that marginal overclock.

See also: Paint Your Computer, lan party, geek vanity, HardOCP
This is quite old. It was commonplace among owners of Acorn's BBC Model B home computer.

After hanging onto your PSU an extended sideways RAM board, a shadow ROM board with some 10 ROMs, maybe a 5.25" floppy disk drive (and we're talking about old kit here, full-height or double height drives!), and leaving it on for a few hours, things would get a little warm. Hot even. In fact, so hot you could smell the plastic...

The reason was fairly simple: the PSU had grilles in the case, but no fan. Or, as we say in the computer case business, it employed a passive cooling system.

The solution was also fairly easy: you'd drill holes in the case, right above the PSU. Normal people drilled to form a bitmap of the BBC owl (and maybe even hung some mesh from below, to prevent things from falling in; people with two left hands (like myself) employed a more creative technique and drilled along a complex chaotic irregular pattern. The end result was the same -- a noticeably cooler case.

Oh, and do yourself a favour and buy disk drives with their own PSU; the beeb's isn't really up to driving a motor...

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