In a disc array apparatus having 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 disk casing is mounted, and
a second connector (detachably) connectable to 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, the disk 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 disk is capable of transferring
from the disk casing to the casing holder.