An electronics module for a data storage device enclosure, and, data storage device enclosures. The module comprises an enclosure connector for connecting to the enclosure, at least one bay constructed and arranged to receive a data storage device, and a controller arranged to selectively provide access to storage devices to which it is connected. The module has a communications path between the controller and the enclosure connector by which the controller can communicate with storage devices in the enclosure. The module also has a first communications path to the data storage device when received in the bay by which the controller can communicate with that data storage device. The module also has a second communications path to the data storage device when received in the bay by which that data storage device can be accessed from outside the module.