Patent ID: 8040680

Claim:
A nonvolatile semiconductor storage device comprising: a printed circuit board having a rectangle shape; a plurality of nonvolatile semiconductor memory chips that are mounted on the printed circuit board, each of the plurality of nonvolatile semiconductor memory chips having a shape configured by a pair of long sides and a pair of short sides; and a memory controller that is mounted on the printed circuit board and controls the plurality of nonvolatile semiconductor memory chips, wherein the plurality of nonvolatile semiconductor memory chips comprises a first nonvolatile semiconductor memory chip, a second nonvolatile semiconductor memory chip and a third nonvolatile semiconductor memory chip arranged on the printed circuit board, wherein one side of the pair of short sides of the first nonvolatile semiconductor memory chip faces one of the side edges of the printed circuit board, wherein a short side of the pair of short sides of the second nonvolatile semiconductor memory chip faces a first long side of the pair of long sides of the first nonvolatile semiconductor memory chip and a short side of the pair of short sides of the third nonvolatile semiconductor memory chip faces a second long side of the pair of long sides of the first nonvolatile semiconductor memory chip, and wherein a through hole in the printed circuit board is disposed at an area adjacent to a long side of the pair of long sides of at least one of the second nonvolatile semiconductor memory chip and the third nonvolatile semiconductor memory chip.