摘要:
The present invention relates to an automated storage system comprising a frame member including a surface (10) and a plurality of openings (11a) extending through the surface, a plurality of storage cells (15) located on one side of the surface, each storage cell being accessible through one of the openings in the surface and being adapted to contain a storage device (8, 9), at least one storage handling device (7, 16) capable of handling a storage device mounted therein, and at least one accessor (6) for transferring data storage devices between the storage handling device and the storage cells. According to the invention the system is characterised in that the frame member surface (10) extends horizontally and the accessor (6) is adapted to move over the horizontal surface.
摘要:
Direct overwriting of encoded data along a track in a magneto-optic recording medium (10) is described. A laser (24) beam, not modulated by data, is directed at the active side of the medium to locally heat the width of one track for conditioning it for direct overwriting. A magnetic head (30) comprising an inductor and a capacitance in parallel with the inductor is movable in an appropriate manner to a selectable track. While the head is in alignment with the beam, current of a preselected polarity is supplied from a current source to the inductor. The current source is disconnected to reverse the field of the magnetic head by reciprocation of energy between the inductor and capacitance. Once the magnetic field is reversed, current is supplied to the inductor for maintaining the field until the next field reversal, the reversal times being determined by the data to be written. For pulse width modulation recording, the current normally supplied to the inductor is of one polarity and that supplied following the reversal is of opposite polarity; whereas for pulse position modulation recording, the current supplied to the inductor is of the same polarity before and after reversal. The inductor is preferably mounted for movement on a voice coil actuator and thereby maintained at a predetermined fixed distance from the medium.
摘要:
Data storage apparatus in which the concentric tracks on a disc are divided into bands (B₀,B₁). A plurality of encoders (7) are used to record data of different densities using different run length limited codes depending on the radial position of the band of tracks. A complementary plurality of decoders (9) are used to generate the decoded read signal.
摘要:
A discrete track magnetic record disk is provided with a plurality of angularly spaced servo sectors (18), each sector being formed of a plurality of discrete blocks (32, 34, 36, 38) of magnetic material which are magnetically polarised in the disk's circumferential direction. These discrete servo blocks (32, 34, 36, 38) and the discrete magnetic tracks (20, 22, 24) are formed at the same time during the fabrication of the record disk so that each servo block is precisely and permanently radially aligned with an associated discrete data track. Following the fabrication of the disk, each of the servo blocks is exposed to the magnetic field generated by passing a direct current (DC) through a recording head. In this manner each of the servo blocks becomes magnetised in the circumferential direction and thereby presents two discrete magnetic transitions to a servo read head or a read/write head.
摘要:
Data storage apparatus in which the concentric tracks on a disc are divided into bands (B₀,B₁). A plurality of encoders (7) are used to record data of different densities using different run length limited codes depending on the radial position of the band of tracks. A complementary plurality of decoders (9) are used to generate the decoded read signal.
摘要:
Direct overwriting of encoded data along a track in a magneto-optic recording medium (10) is described. A laser (24) beam, not modulated by data, is directed at the active side of the medium to locally heat the width of one track for conditioning it for direct overwriting. A magnetic head (30) comprising an inductor and a capacitance in parallel with the inductor is movable in an appropriate manner to a selectable track. While the head is in alignment with the beam, current of a preselected polarity is supplied from a current source to the inductor. The current source is disconnected to reverse the field of the magnetic head by reciprocation of energy between the inductor and capacitance. Once the magnetic field is reversed, current is supplied to the inductor for maintaining the field until the next field reversal, the reversal times being determined by the data to be written. For pulse width modulation recording, the current normally supplied to the inductor is of one polarity and that supplied following the reversal is of opposite polarity; whereas for pulse position modulation recording, the current supplied to the inductor is of the same polarity before and after reversal. The inductor is preferably mounted for movement on a voice coil actuator and thereby maintained at a predetermined fixed distance from the medium.
摘要:
A discrete track magnetic record disk is provided with a plurality of angularly spaced servo sectors (18), each sector being formed of a plurality of discrete blocks (32, 34, 36, 38) of magnetic material which are magnetically polarised in the disk's circumferential direction. These discrete servo blocks (32, 34, 36, 38) and the discrete magnetic tracks (20, 22, 24) are formed at the same time during the fabrication of the record disk so that each servo block is precisely and permanently radially aligned with an associated discrete data track. Following the fabrication of the disk, each of the servo blocks is exposed to the magnetic field generated by passing a direct current (DC) through a recording head. In this manner each of the servo blocks becomes magnetised in the circumferential direction and thereby presents two discrete magnetic transitions to a servo read head or a read/write head.