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In evitably with any “homebrew” project like this Pentium 4 system in a shoebox, you need some strange parts. For the Mocha 620, here are some:

• LOGIC Supply Slimline CD to IDE adapter. This slimline CD to desktop IDE adapter is used for converting a laptop CD-ROM or DVD drive with a 50-pin connector to a desktop enhanced IDE (ATA) 40-pin connector. Power is supplied through a 3.5” 4 pin mini connector. Two analog audio connectors use the standard 4-pin connection. It is just $7, but pretty hard to put a notebook CD into a desktop case without it.
• Notebook HD to IDE Converter. Others stock this, but it takes a Notebook 44-pin hard drive and converts it into a standard 40-pin IDE desktop adapter plus a Molex power connector used in desktops
• USB front panel cable. If you are moron like me and have ripped out some of these tiny connectors, here is something that takes a USB header on a motherboard and connects it to another PC card.

• Cooler Master Pentium 4 CPU Cooler DI-7H53D-08. A low profile cooler for Pentium 4 socket 478 systems. 31dBA and $18.