Dish array apparatus with improved heat energy transfer

A disc array apparatus comprising a plurality of disc units, and a plurality of first connectors, each of which disc units includes a disc casing surrounding at least one recording disc rotatable therein on a rotatable axis, a casing holder on which the disc casing is mounted, and a second connector connectable to a corresponding one of the first connectors so that at least an electric connection between the disc casing and the corresponding one of the first connectors is capable of being formed through the second connector,

• wherein the disc casing is connected to the casing holder in such a manner that a heat energy generated for at least one of recording an information onto the recording disc and reading out the information from the recording disc is capable of transferring from the disc casing to the casing holder, one of the casing holder and the disc casing includes a viscous element contacting the other one of the casing holder and the disc casing so that the heat energy is capable of transferring from the disc casing to the casing holder through the viscous element, the viscous element includes at least one of a thermally conductive metallic grain and a thermally conductive ceramic grain, and the whole of the recording disc and at least a part of the viscous element overlap each other as seen in a direction parallel to the rotatable axis,
• wherein the casing holder has a heat energy discharge accelerating region, a gaseous flow is capable of being urged mainly in a direction perpendicular to the rotatable axis, and the heat energy discharge accelerating region is arranged in such manner that the recording disc and the heat energy discharge accelerating region are juxtaposed to each other in the direction perpendicular to the rotatable axis so as to enable the gaseous flow that is capable of being urged in the direction perpendicular to the rotatable axis to pass on the disc casing and the heat energy discharge accelerating region, and the heat energy discharge accelerating region includes a plurality of protrusions protruding in a direction parallel to the rotatable axis, with a clearance between the protrusions.