Abstract: A plurality of magnetic memories with respective ring-shaped magnetic layers therein are prepared. The magnetic layers have respective notches formed by partially cutting out the peripheries thereof in circular arc shape. The magnetic memories are arranged in plane so that the surfaces of the notches are parallel to one another.

Abstract: A magnetic memory is composed of a ring-shaped magnetic layer that includes a notch having a circular arc shape. The notch is formed by partially cutting out the periphery of the ring-shaped magnetic layer. A ratio h/H1 for the magnetic layer is set to be equal to or greater than 0.01 where “h” is the height of the notch and “H1” is the outer diameter of the magnetic layer.

Abstract: A magnetic memory includes a magnetic substance composed of a disc-shaped first magnetic layer and a ring-shaped second magnetic layer which is formed on the first magnetic layer.

Abstract: A disk recording medium of the present invention comprises an antimicrobial agent and an antifungal agent.

Abstract: Plate-shaped rectifying plates 50, the area of which that corresponds to the part of a body spring 20 from the tip thereof to an elastic bending portion 31 thereof being opened, are respectively provided to proximal portions 30 of upper and lower suspensions 17 and 18 carrying heads 26 of a magnetic recording device. Thereby, when recording and reproducing onto and from a disk 2 are performed by the magnetic recording device, stable recording and reproducing onto and from the disk 2 is enabled, by reducing the variation in height of each head 26 from the surface of the disk 2 by utilizing the airflow flowing across the disk 2 by means of the rectifying plate 50.

Abstract: A disk-shaped magnetic recording medium for use in a small magnetic disk cartridge, comprising a flexible disk-shaped magnetic sheet, and a rigid annular member attached to the outer circumferential edge portion of one side of the magnetic sheet.

Abstract: A disk-shaped magnetic recording medium for use in a small magnetic disk cartridge, comprising a flexible disk-shaped magnetic sheet, and a rigid annular member attached to the outer circumferential edge portion of one side of the magnetic sheet.

Abstract: A small magnetic disk cartridge for use in a card disk drive to be loaded in electronic equipment. The magnetic disk cartridge comprises a housing, a disk-mounting hub rotatable within the housing by a spindle provided in the disk drive, and a flexible magnetic disk mounted at one point on the disk-mounting hub.

Abstract: A magnetic disk cartridge which is used with a high density recording magnetic disk and which provides good recording and reproducing properties. The magnetic disk cartridge has a flexible magnetic disk having a disk-like center core. The upper surface of the disk-like center core is centrally affixed to the magnetic disk. The magnetic disk is rotatably retained in a flat housing. The magnetic disk has a surface recording density of at least about 158.7 Mbit/cm2. The disk wobbling value of the magnetic disk measured at a radial position located 5 mm outward from the outer diameter of the center core of the magnetic disk while rotating the magnetic disk by means of a drive device via the center core is not more than 20 &mgr;m.

Abstract: A plurality of magnetic memories with respective ring-shaped magnetic layers therein are prepared. The magnetic layers have respective notches formed by partially cutting out the peripheries thereof in circular arc shape. The magnetic memories are arranged in plane so that the surfaces of the notches are parallel to one another.

Abstract: A small magnetic disk cartridge comprising a housing, a rotatably disk-mounting hub, and a magnetic disk mounted on the disk-mounting hub. The disk-mounting hub is rotatably supported by the housing through a bearing equipped with inner and outer races that are mutually rotatable.

Abstract: A magnetic memory includes a magnetic substance composed of a disc-shaped first magnetic layer and a ring-shaped second magnetic layer which is formed on the first magnetic layer.

Abstract: A magnetic disc medium comprising: a support; a substantially nonmagnetic lower layer; and a magnetic layer comprising a binder and hexagonal ferrite powder dispersed in the binder, in this order, wherein the magnetic disc medium has an outside diameter of from 20 to 50 mm, an amount of run out in a vertical direction at an outside perimeter of the disc medium in recording and reproducing of 50 &mgr;m or less, and an amount of run out in a vertical direction at an inside perimeter of the disc medium in recording and reproducing of 25 &mgr;m or less, and a recording and reproducing method of the magnetic disc medium, wherein the magnetic disc medium has an outside diameter of from 20 to 50 mm, and recording and reproducing are performed at an engine speed to make an amount of run out in a vertical direction at an outside perimeter of the disc medium 50 &mgr;m or less, and an amount of run out in a vertical direction at an inside perimeter 25 &mgr;m or less.

Abstract: A magnetic memory is composed of a ring-shaped magnetic layer having a notch formed by partially cutting out the periphery thereof in circular arc shape.

Abstract: The invention provides a magnetic disk cartridge and associated magnetic disk drive capable of performing high-speed read/write operations on the magnetic disk medium of the cartridge.

Abstract: A small magnetic disk cartridge comprising a housing, a rotatably disk-mounting hub, and a magnetic disk mounted on the disk-mounting hub. The disk-mounting hub is rotatably supported by the housing through a bearing equipped with inner and outer races that are mutually rotatable.

Abstract: A small magnetic disk cartridge for use in a card disk drive to be loaded in electronic equipment. The magnetic disk cartridge comprises a housing, a disk-mounting hub rotatable within the housing by a spindle provided in the disk drive, and a flexible magnetic disk mounted at one point on the disk-mounting hub.

Abstract: A disk-shaped magnetic recording medium for use in a small magnetic disk cartridge, comprising a flexible disk-shaped magnetic sheet, and a rigid annular member attached to the outer circumferential edge portion of one side of the magnetic sheet.

Abstract: A disk recording medium of the present invention comprises an antimicrobial agent and an antifungal agent.

Abstract: The present invention provides a disc magnetic recording medium which provides remarkable improvements in electromagnetic characteristics, particularly high density recording properties, and exhibits excellent magnetic properties with various sizes. A disc type magnetic recording medium is disclosed, comprising a substantially non-magnetic layer and a magnetic layer provided on a non-magnetic support in this order, said magnetic layer comprising a ferromagnetic metal fine powder or ferromagnetic hexagonal ferrite fine powder dispersed in a binder, wherein said non-magnetic support is an aramide or polyethylene naphthalate having a central plane average surface roughness SRa of not more than 10 mm and there is the following relationship between the thickness d (.mu.m) of the non-magnetic support and the outermost diameter D (mm) of the recording area:1.25.ltoreq.D/d.ltoreq.2.50 (when the non-magnetic support is an aramide)1.00.ltoreq.D/d.ltoreq.2.