Abstract: A disk device according to one embodiment includes a magnetic disk, a magnetic head, and a flexible printed circuit board. The flexible printed circuit board is electrically connected to the magnetic head. The flexible printed circuit board includes a first layer, a second layer having conductive property, and a third layer having insulation property. The first layer includes a first surface having insulation property. The second layer overlays the first surface, and includes a first conductor and a second conductor spaced from the first conductor. The third layer covers at least a part of the first surface and at least a part of the second layer. The flexible printed circuit board is provided with a first hole that is located between the first conductor and the second conductor with spacing from the second layer and penetrates the third layer.

Abstract: According to one embodiment, a disk device includes a magnetic disk, a magnetic head, a first FPC, and a second FPC. The first FPC includes first terminals. The magnetic head is mounted on the first FPC and electrically connected to at least one of the first terminals. The second FPC includes a surface, second terminals on the surface, and a first ground plane. The second terminals are individually bonded to the corresponding first terminals with a conductive bonding material. The first ground plane covers at least one of the second terminals in a direction orthogonal to the surface. The second terminals include a first read terminal through which an electric signal representing information read from the magnetic disk by the magnetic head passes. The first ground plane is located apart from at least a part of the first read terminal in a direction along the surface.

Abstract: A disk device according to one embodiment includes a magnetic disk, a magnetic head, and a flexible printed circuit board. The flexible printed circuit board is electrically connected to the magnetic head. The flexible printed circuit board includes a first layer, a second layer having conductive property, and a third layer having insulation property. The first layer includes a first surface having insulation property. The second layer overlays the first surface, and includes a first conductor and a second conductor spaced from the first conductor. The third layer covers at least a part of the first surface and at least a part of the second layer. The flexible printed circuit board is provided with a first hole that is located between the first conductor and the second conductor with spacing from the second layer and penetrates the third layer.

Abstract: according to one embodiment, a disk device includes a magnetic disk, a magnetic head, a first FPC, and a second FPC. The first FPC includes first terminals. The magnetic head is mounted on the first FPC and electrically connected to at least one of the first terminals. The second FPC includes a surface, second terminals on the surface, and a first ground plane. The second terminals are individually bonded to the corresponding first terminals with a conductive bonding material. The first ground plane covers at least one of the second terminals in a direction orthogonal to the surface. The second terminals include a first read terminal through which an electric signal representing information read from the magnetic disk by the magnetic head passes. The first ground plane is located apart from at least a part of the first read terminal in a direction along the surface.

Abstract: A disk device according to one embodiment includes a magnetic disk, a magnetic head, and a flexible printed circuit board. The flexible printed circuit board is electrically connected to the magnetic head. The flexible printed circuit board includes a first layer, a second layer having conductive property, and a third layer having insulation property. The first layer includes a first surface having insulation property. The second layer overlays the first surface, and includes a first conductor and a second conductor spaced from the first conductor. The third layer covers at least a part of the first surface and at least a part of the second layer. The flexible printed circuit board is provided with a first hole that is located between the first conductor and the second conductor with spacing from the second layer and penetrates the third layer.