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A disk array system includes a plurality of disk drives and at least one unit box including the plurality of disk drives aligned in the thickness direction of the disk drive, each disk drive including a thin case accommodating a recording disk, a read/write head, and a driving mechanism for driving

A disk array system includes a plurality of disk drives and at least one unit box including the plurality of disk drives aligned in the thickness direction of the disk drive, each disk drive including a thin case accommodating a recording disk, a read/write head, and a driving mechanism for driving the recording disk and the read/write head, and a control board for controlling the driving mechanism, the control board being mounted on the thin case. In the disk array system, the thin case and the unit box are composed of a thermally-conductive material, the unit box includes surfaces parallel to the thickness direction of the plurality of disk drives, and at least one of the surfaces has a cold plate filled with a refrigerant. Heat generated at the disk drives is transferred to the cold plate, thereby improving cooling performance.

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What is claimed is: 1. The disk array system comprising: a plurality of disk drives; and at least one unit box including the plurality of disk drives aligned in the thickness direction of the disk drive, the plurality of disk drives comprising: a thin case accommodating a recording disk, a read/wri

What is claimed is: 1. The disk array system comprising: a plurality of disk drives; and at least one unit box including the plurality of disk drives aligned in the thickness direction of the disk drive, the plurality of disk drives comprising: a thin case accommodating a recording disk, a read/write head, and a driving mechanism for driving the recording disk and the read/write head; and a control board for controlling the driving mechanism, the control board being mounted on the thin case, wherein the thin case and the unit box are comprised of a thermally-conductive material, the unit box has surfaces parallel to the thickness direction of the plurality of disk drives, and at least one of the surfaces of the unit box includes a heat absorption unit filled with a refrigerant, wherein the disk drive is accommodated in a box-shaped housing comprised of a thermally-conductive material, the housing is removably disposed in the unit box, and a heat-transfer accelerating unit is disposed between inner surfaces of the unit box and side surfaces of the housing facing the inner surfaces of the unit box so as to fill the gap between the inner surfaces of the unit box and the side surfaces of the housing, the heat-transfer accelerating unit accelerating thermal coupling of the unit box and the housing, wherein side surfaces of the thin case are fixed to inner surfaces of the housing via a thermally-conductive component, the control board is mounted on a first outer surface of the thin case, and a second outer surface of the thin case is attached to an inner bottom surface of the housing through a thermally-conductive flexible component. 2. The disk array system according to claim 1, further comprising another unit box stacked on the unit box, the top surface of the top unit box and the lower surface of the bottom unit box having the heat absorption unit. 3. The disk array system according to claim 1, wherein the heat absorption unit is comprised of a plate including a refrigerant channel through which the refrigerant passes, and ducts connect two edges of the refrigerant channel in the heat absorption unit to two respective edges of a refrigerant channel in a radiator disposed remote from the unit box. 4. The disk array system according to claim 3, wherein the radiator is disposed above the unit box, and the refrigerant spontaneously circulates through the heat absorption unit, the ducts, and the radiator. 5. The disk array system according to claim 1, wherein the heat-transfer accelerating unit is comprised of thermally-conductive rubber, thermally-conductive grease, or a thermally-conductive spring. 6. The disk array system according claim 1, wherein the heat-transfer accelerating unit is comprised of a guiding groove for inserting/removing the housing into/from the unit box, the guiding groove engaging the side surfaces of the housing and the inner surfaces of the unit box. 7. The disk array system comprising: a plurality of disk drives; and at least one unit box including the plurality of disk drives aligned in the thickness direction of the disk drive, the plurality of disk drives comprising: a thin case accommodating a recording disk, a read/write head, and a driving mechanism for driving the recording disk and the read/write head; and a control board for controlling the driving mechanism, the control board being mounted on the thin case, wherein the thin case and the unit box are comprised of a thermally-conductive material, the unit box has surfaces parallel to the thickness direction of the plurality of disk drives, and at least one of the surfaces of the unit box includes a heat absorption unit filled with a refrigerant, wherein the heat absorption unit is comprised of a plate including a refrigerant channel through which the refrigerant passes, and ducts connect two edges of the refrigerant channel in the heat absorption unit to two respective edges of a refrigerant channel in a radiator disposed remote from the unit box wherein the refrigerant is a gas-liquid two-phase refrigerant, a compressor for compressing the refrigerant is disposed at one of the ducts, and a decompressor is disposed at the other duct. 8. The disk array system according to claim 3 or 7, wherein a pump for circulating the refrigerant is disposed at one of the ducts. 9. The disk array system according to claim 3 or 7, further comprising a cooling fan for cooling the radiator. 10. The disk array system according to claim 7, wherein the thin case is disposed close to the back of the unit box, and the refrigerant channel in the heat absorption unit meanders along the longitudinal direction of the unit box such that the refrigerant flows through the refrigerant channel from the back to the front of the unit box. 11. The disk array system according to claim 7, further comprising a casing including a plurality of racks on which the respective unit boxes are placed; a power-supply unit disposed at the bottom of the casing; and an exhaust fan for introducing air from openings on side surfaces of the casing and exhausting from the top surface of the casing, wherein the heat absorption unit in each of the plurality of unit boxes is comprised of a plate including a refrigerant channel through which the refrigerant passes, and ducts connect two ends of the refrigerant channel in the heat absorption unit to two respective ends of a refrigerant channel in the radiator disposed in the airflow of the exhaust fan. 12. The disk array system comprising: a plurality of disk drives; and at least one unit box including the plurality of disk drives aligned in the thickness direction of the disk drive, the plurality of disk drives comprising: a thin case accommodating a recording disk, a read/write head, and a driving mechanism for driving the recording disk and the read/write head; and a control board for controlling the driving mechanism, the control board being mounted on the thin case, wherein the thin case and the unit box are comprised of a thermally-conductive material, the unit box has surfaces parallel to the thickness direction of the plurality of disk drives, and at least one of the surfaces of the unit box includes a heat absorption unit filled with a refrigerant, wherein the heat absorption unit is comprised of a plate including a refrigerant channel through which the refrigerant passes, and ducts connect two edges of the refrigerant channel in the heat absorption unit to two respective edges of a refrigerant channel in a radiator disposed remote from the unit box, wherein the radiator is disposed above the unit box, and the refrigerant spontaneously circulates through the heat absorption unit, the ducts, and the radiator, wherein the thin case is disposed close to the back of the unit box, and the refrigerant channel in the heat absorption unit meanders along the longitudinal direction of the unit box such that the refrigerant flows through the refrigerant channel from the back to the front of the unit box. 13. The disk array system comprising: a plurality of disk drives; and at least one unit box including the plurality of disk drives aligned in the thickness direction of the disk drive, the plurality of disk drives comprising: a thin case accommodating a recording disk, a read/write head, and a driving mechanism for driving the recording disk and the read/write head; and a control board for controlling the driving mechanism, the control board being mounted on the thin case, wherein the thin case and the unit box are comprised of a thermally-conductive material, the unit box has surfaces parallel to the thickness direction of the plurality of disk drives, and at least one of the surfaces of the unit box includes a heat absorption unit filled with a refrigerant, wherein the heat absorption unit includes at least one heat pipe filled with the refrigerant, one end of the heat pipe being connected to the heat absorption unit, and a radiator is disposed at the other end of the heat pipe. 14. The disk array system according to claim 13, wherein the heat absorption unit is comprised of a cold plate having a space filled with the refrigerant, the cold plate comprising the surface of the unit box, the cold plate including at least one fin on an outer surface of the cold plate. 15. The disk array system comprising: a plurality of disk drives; and at least one unit box including the plurality of disk drives aligned in the thickness direction of the disk drive, the plurality of disk drives comprising: a thin case accommodating a recording disk, a read/write head, and a driving mechanism for driving the recording disk and the read/write head; and a control board for controlling the driving mechanism, the control board being mounted on the thin case, wherein the thin case and the unit box are comprised of a thermally-conductive material, the unit box has surfaces parallel to the thickness direction of the plurality of disk drives, and at least one of the surfaces of the unit box includes a heat absorption unit filled with a refrigerant, wherein the heat absorption unit is comprised of a plate including a refrigerant channel through which the refrigerant passes, and ducts connect two edges of the refrigerant channel in the heat absorption unit to two respective edges of a refrigerant channel in a radiator disposed remote from the unit box, wherein the radiator is disposed above the unit box, and the refrigerant spontaneously circulates through the heat absorption unit, the ducts, and the radiator, wherein at least one unit box comprises a plurality of unit boxes, the disk array system further comprising: a casing including a plurality of racks on which the respective unit boxes are placed; a power-supply unit disposed at the bottom of the casing; and an exhaust fan for introducing air from openings on side surfaces of the casing and exhausting from the top surface of the casing, wherein the heat absorption unit in each of the plurality of unit boxes is comprised of a plate including a refrigerant channel through which the refrigerant passes, and ducts connect two ends of the refrigerant channel in the heat absorption unit to two respective ends of a refrigerant channel in the radiator disposed in the airflow of the exhaust fan. 16. A disk array system comprising: a plurality of disk drives; and at least one unit box including the plurality of disk drives aligned in the thickness direction of the disk drive, the plurality of disk drives comprising: a thin case accommodating a recording disk, a read/write head, and a driving mechanism for driving the recording disk and the read/write head; and a control board for controlling the driving mechanism, the control board being mounted on the thin case, wherein the thin case and the unit box are comprised of a thermally-conductive material, the unit box has surfaces parallel to the thickness direction of the plurality of disk drives, and at least one of the surfaces of the unit box includes a heat absorption unit filled with a refrigerant, wherein the heat absorption unit is comprised of a plate including a refrigerant channel through which the refrigerant passes, and ducts connect two edges of the refrigerant channel in the heat absorption unit to two respective edges of a refrigerant channel in a radiator disposed remote from the unit box, wherein the refrigerant is a gas-liquid two-phase refrigerant, a compressor for compressing the refrigerant is disposed at one of the ducts, and a decompressor is disposed at the other duct, and wherein the thin case is disposed close to the back of the unit box, and the refrigerant channel in the heat absorption unit meanders along the longitudinal direction of the unit box such that the refrigerant flows through the refrigerant channel from the back to the front of the unit box. 17. A disk array system comprising: a plurality of disk drives; and at least one unit box including the plurality of disk drives aligned in the thickness direction of the disk drive, the plurality of disk drives comprising: a thin case accommodating a recording disk, a read/write head, and a driving mechanism for driving the recording disk and the read/write head; and a control board for controlling the driving mechanism, the control board being mounted on the thin case, wherein the thin case and the unit box are comprised of a thermally-conductive material, the unit box has surfaces parallel to the thickness direction of the plurality of disk drives, and at least one of the surfaces of the unit box includes a heat absorption unit filled with a refrigerant, wherein the heat absorption unit is comprised of a plate including a refrigerant channel through which the refrigerant passes, and ducts connect two edges of the refrigerant channel in the heat absorption unit to two respective edges of a refrigerant channel in a radiator disposed remote from the unit box, wherein a pump for circulating the refrigerant is disposed at one of the ducts, and a plurality of disk drives; and at least one unit box including the plurality of disk drives aligned in the thickness direction of the disk drive, the plurality of disk drives comprising: a thin case accommodating a recording disk, a read/write head, and a driving mechanism for driving the recording disk and the read/write head; and a control board for controlling the driving mechanism, the control board being mounted on the thin case, wherein the thin case and the unit box are comprised of a thermally-conductive material, the unit box has surfaces parallel to the thickness direction of the plurality of disk drives, and at least one of the surfaces of the unit box includes a heat absorption unit filled with a refrigerant, wherein the heat absorption unit is comprised of a plate including a refrigerant channel through which the refrigerant passes, and ducts connect two edges of the refrigerant channel in the heat absorption unit to two respective edges of a refrigerant channel in a radiator disposed remote from the unit box, wherein the radiator is disposed above the unit box, and the refrigerant spontaneously circulates through the heat absorption unit, the ducts, and the radiator, and wherein the thin case is disposed close to the back of the unit box, and the refrigerant channel in the heat absorption unit meanders along the longitudinal direction of the unit box such that the refrigerant flows through the refrigerant channel from the back to the front of the unit box.