Iria

At the lowest level a computer case is a way for you to keep all of your computer gear together and protected. The basic design of the computer case has not changed much over the years however in today's world there are many different things a computer is used for. Some require a small case and others require a large chassis with room to spare. Sadly not all manufactures would agree and some of the biggest names in the business have left many of these design ideas on the ground a long time ago.
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Source: Ninjalane