A mobile hard disk drive (HDD) rack includes an inner casing adapted to receive an HDD therein and having a plurality of connectors of different interface specifications to be selectively connected to the HDD. The inner casing includes a first conversion circuit which converts the interface specification of each of the connectors into a predetermined interface specification. An outer casing is adapted to be mounted in a computer to receive the inner casing therein and electrically connect thereto. The outer casing may optionally include a second conversion circuit which converts the predetermined interface specification into a plurality of different interface specifications each having a connector mounted on the outer casing associated therewith so as to allow the computers of different HDD interfaces to be selectively connected thereto. By means of such an arrangement, HDDs of different interfaces may be readily and exchangeably connected to the computers of different HDD interfaces.
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