Case for memory or data storage

1 . A storage device comprising:

a printed circuit board (PCB) with attached semiconductor chips, each including a memory, and with at least one wire coupling the semiconductor chips; and

a case comprising a first case surrounding a top portion of the printed circuit board and a second case surrounding a bottom portion of the printed circuit board,

wherein a flat sidewall of the first case and a protrusion of the second case form a stepped bending structure, the protrusion surrounded by the flat sidewall,

the flat sidewall of the first case is coupled to an inner portion which extends partially downward and along the flat sidewall and faces the protrusion of the second case,

both the flat sidewall of the first case extending below a lower surface of the printed circuit board and the protrusion of the second case extending above an upper surface of the printed circuit board cover all of a side of the printed circuit board, and

the inner portion extending partially downward and along the flat sidewall of the first case and the protrusion of the second case extending above the upper surface of the printed circuit board are separated by a slit present above the printed circuit board, and

the inner portion, extending partially downward and along the flat sidewall of the first case, stops above the slit present above the printed circuit board such that the slit above the printed circuit board provides electromagnetic shielding.

2 . The storage device according to claim 1 , further comprising a carrier attached with the case and configured to couple the case to a rack which is capable of arranging plural storage devices in a row direction, a column direction, or row and column directions,

wherein the carrier comprises at least one component coupled to a ground voltage.

3 . The storage device according to claim 1 , wherein the flat sidewall meets the protrusion, when the first case and the second case are joined to each other, such that a crack between the flat sidewall and the protrusion in the stepped bending structure extends from between the printed circuit board and the second case to between the printed circuit board and the first case, and

wherein the crack is between the protrusion and the inner portion.

4 . The storage device according to claim 3 , wherein a side of the protrusion facing the side of the printed circuit board is flat.

5 . The storage device according to claim 4 ,

wherein the inner portion is spaced apart from the inner side of the flat sidewall to form a trench between the flat sidewall and the inner portion of the first case,

wherein the protrusion is inserted into the trench when the first case and the second case are joined to each other.

6 . The storage device according to claim 3 ,

wherein the first case and the second case have a detachable structure, and

wherein the crack correlates with an assembly tolerance of the first case and the second case.

7 . The storage device according to claim 3 , wherein the crack is extended from a bottom of the second case to a top of the first case.

8 . The storage device according to claim 1 ,

wherein the flat sidewall of the first case is arranged outside the protrusion of the second case, and

wherein the protrusion of the second case is arranged with the printed circuit board in a space formed by the flat sidewall of the first case.

9 . The storage device according to claim 1 , wherein the PCB has a hole, through which the first case and the second case are to be coupled to each other.

10 . An electrical apparatus comprising:

a printed circuit board; and

first and second cases covering a top and a bottom of the printed circuit board,

wherein the first and second cases are detachable, and

wherein a flat sidewall of the first case extending below a lower surface of the printed circuit board and a protrusion of the second case extending above an upper surface of the printed circuit board cover all of a side of the printed circuit board, the protrusion surrounded by the flat sidewall,

wherein a side of the protrusion facing the side of the printed circuit board is flat, wherein the flat sidewall of the first case is coupled to an inner portion which extends partially downward and along the flat sidewall of the first case and faces the protrusion of the second case, and

wherein the inner portion, extending partially downward and along the flat sidewall of the first case, stops above a slit present above the printed circuit board such that the slit above the printed circuit board provides electromagnetic shielding.

11 . The electrical apparatus according to claim 10 , wherein the inner portion of the first case and the protrusion of the second case extending above the upper surface of the printed circuit board are separated by the slit present above the printed circuit board.

12 . The electrical apparatus according to claim 11 , wherein the inner portion and the flat sidewall are attached to each other without any space therebetween.

13 . The electrical apparatus according to claim 11 , wherein the protrusion is inserted into a trench formed between the inner portion and spaced apart from the inner side of the flat sidewall.

14 . The electrical apparatus according to claim 13 , wherein the inner portion and the protrusion have a same height.

15 . The electrical apparatus according to claim 11 ,

wherein the flat sidewall, the protrusion, and the inner portion forms a stepped bending structure, and

wherein a crack between the flat sidewall and the protrusion extends from between the printed circuit board and the second case to between the printed circuit board and the first case.

16 . The electrical apparatus according to claim 15 , wherein the crack correlates with an assembly tolerance of the first case and the second case.

17 . The electrical apparatus according to claim 16 , further comprising a carrier attached with the case and configured to couple the case to a rack which is capable of arranging plural storage devices in a row direction, a column direction, or row and column directions.

18 . The electrical apparatus according to claim 17 , wherein the carrier comprises at least one component coupled to a ground voltage.

19 . The electrical apparatus according to claim 10 , wherein the printed circuit board has a hole, through which the first case and the second case are to be coupled to each other.

20 . The electrical apparatus according to claim 10 , wherein the printed circuit board is spaced apart respectively from the first case and the second case by a same distance.