Small running motor is of course the hard drive motor. It sometimes stop.
I did upgrade my 5IT to SDE and Froyo and Gingerbread.
Upgrading to SDE doesn't make you earn something other than losing the unit's warranty. Everything is working as they should. BUT,
If you upgrade yor Android to Froyo or Gingerbread, you will lose everything including the Archos Tools, bluetooth, AND your docking station will become a big and very expensive BATTERY CHARGER.
After the upgrade, you will feel that your entertainment gadget is not entertaining you anymore you will see yourself always dealing with bullshit problems. Your device will become a laboratory test device which have no other use.
In a few days, after having angry times with what you had done to your lovely unit, you will downgrade the unit to its original state and feel happy ever after.
I absolutely not recommend these upgrades.