Monday, June 15, 2009

Suspension Mount Hard Disk

I have gone with a 2.5 inch laptop drive for this version. Much smaller, and should also be much quieter. However I will try and do some kind of suspension mounting - elastic straps - just to ensure that none of the noise gets transferred to the case.

Inspiration comes from the following arrangements...

Based on the overall design, the hard disk needs to be mounted underneath the motherboard - the motherboard will be around 17mm off the metal base of the case. After some initial thinking I can up with the following solution - involving a few bits of bent metal, and the elastic cords...

Basically two 'L' shaped pieces of metal are screwed onto the sides of the disk drive. These pieces of metal have two holes drilled in them for the elastic to pass through. The elastic then is threaded through four mounting eyes that are riveted to the main metal case bottom.
When the elastic is not pulled tightly, the hard disk rests on the long piece of elastic on either side... when the elastic is pulled tighter, then these bits of elastic are pulled 1~2 mm off of the base of the case.

My thoughts were that if the elasticity dies off slowly, then at least worst case is that the hard disk is isolated from the case by resting on the elastic.

(One point - the main ends of the elastic wander off and are currently tied off on the motherboard support posts - I will finalise and tie them off in knots once the rest of the pieces are in place at a later date.)

Note that some other thoughts that went into the mounting of the hard disk - include the ventilation.
The overall grand plans for air flow are as follows

Fresh air should be sucked into the case from an opening in the back of the case, just below the power supply vent point (1.).
This air will then be directed (by some to be designed ducting) to flow underneath the motherboard, gently over the hard disk (2.). It will then pass up over the edge of the motherboard (3.) and back over the top side of the mother board and then eventually out through the power supply (4.). I should talk about this in a later post on the power supply...

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