Direct Drive

@sokogear , Yes, that is what I said.

@lewm , accepted. I know exactly what speed my platter is running at to 1/1000th of an RPM. The turntable tells me in bright green LEDs. The motor is not mounted to the sub chassis. It is mounted on a separate platform that places the pulley, belt and thrust bearing in the same plane. Under normal circumstances there is no movement between the motor and sub chassis and no belt slippage at all. The belt itself is a filter, a low frequency filter. Below that frequency everything moves together such as if I lift the turntable up and down slowly. Above that frequency such as at pulley speed all vibration is absorbed by the belt. Nothing gets to the platter. 

 As in a classical motor, the rotor is driven by the stator due to electromagnetic interaction.  Nothing physically touches the rotor (in this case, synonymous with the platter) in a motor

What about the bearing?

@mijostyn  - I was surprised to hear you prefer the Thorens over the SOTA that you have gushed about in the past.

@sokogear , Why? A Sota Sapphire with a Kuzma 4 Point 9 is $8000. The Thorens is 1/2 the price. 

Ketchup, I take the bearing as a given for any turntable of any type.  So there is no special problem of a bearing in a DD type.  All platters ride on some sort of bearing.

Mijostyn, I don't know precisely how a Cosmos is constructed, but I do know that  SOTA have improved upon basic design of a suspended BD.  When you mention a "separate platform" for the motor, it must nevertheless be either suspended along with the bearing and platter or fixed in space.  Which is it? How is the platform isolated from the subchassis or shelf?  I'm just curious, not contentious.

You wrote, "Above that frequency such as at pulley speed all vibration is absorbed by the belt. Nothing gets to the platter."  Come on.  Nothing designed by men is that perfect.  The belt is a filter with a certain cut off frequency and rate of attenuation of mechanical energy.