A card connector includes an insulating housing having a base board of which two sides of a top define two sliding chutes each extending along a front-to-rear direction. As units coupled to the bus are stopped, bandwidth requirements are lowered and the bus frequency is reduced in response to the lowered bandwidth requirements. The firmware is programmed to probe the removable nonvolatile memory device, and to load the diagnostics code contained thereon into main memory and to execute the diagnostics in response to an initiation by an operator’s key sequence. Tightening the drag capsule on the spindle shaft forcibly engages friction surfaces on the spindle shaft, the spool, the drive plate, and the drag capsule to provide an adjustable dual disk drag mechanism, as well as securing the drive plate and spool together. Alternatively, the data center can encrypt the documents before sending. A heating stabilization device can be used in such an apparatus.