Hitachi, Ltd.

Hitachi Global Storage Technologies Japan, Ltd.

Koji Kodama

Hideaki Amano

Katsuhiro Tsuneta

Yuichi Koizumi

Atsushi Ito

Hiroshi Nishida

Tomoyuki Ohno

Hiroaki Ohta

Yusuke Miyamoto

Kojiro Hayashi

An information storing device and an information processing device having a memory for registering a plurality of working modes at recording/reproduction and a switching circuit for selecting one of the plurality of working modes, which select the optimum working mode automatically or by an instruction of an operator according to power supply capacity of a device of higher rank to effect recording/reproduction.

Information storing device and method for controlling same to record/reproduce information by selecting one of working modes

Information storing device and method for controlling same to record/reproduce information by selection one of working modes

An information storing device and an information processing device having a memory for registering a plurality of working modes at recording/reproduction and a switching circuit for selecting one of the plurality of working modes, which select the optimum working mode automatically or by an instruction of ah operator according to power supply capacity of a device of higher rank to effect recording/reproduction.

The electric circuit,is electrically separated into two portions, a first electric circuit portion,and a second electric circuit portion,which processes a small analog signal. The ground,of the first electric circuit portion can be connected to the ground,of the host unit. The ground and power supply lines of the amplifier,in the assembly,are connected directly to those of the second electric circuit portion, respectively. An optical data and signals transmitting/receiving member, such as a photocoupler,, transmits and receives data and signals between the first electric circuit portion and the second electric circuit portion and is provided between both these portions. An enclosure,encloses and shields electro-magnetically the whole device with an electric conductor. A conductive connecting member,is provided between the electric conductor of the enclosure and the ground,of the host unit.

Disk device and removable magnetic disk device with electrically separated circuit portions for improved electro-magnetic compatibility

Information storing device and method for controlling same to

The electric circuit 108 is electrically separated into two portions, a first electric circuit portion 109 and a second electric circuit portion 110 which processes a small analog signal. The ground 126 of the first electric circuit portion can be connected to the ground 125 of the host unit. The ground and power supply lines of the amplifier 107 in the assembly 102 are connected directly to those of the second electric circuit portion, respectively. An optical data and signals transmitting/receiving member, such as a photocoupler 114, transmits and receives data and signals between the first electric circuit portion and the second electric circuit portion and is provided between both these portions. An enclosure 101 encloses and shields electro-magnetically the whole device with an electric conductor. A conductive connecting member 123 is provided between the electric conductor of the enclosure and the ground 124 of the host unit.

Disk device and removable magnetic disk device with electrically

A magnetic disk unit has a magnetic head-disk stickiness eliminating mechanism suitable for a small-sized, low power consumption type magnetic disk unit of a high recording density. The magnetic disk unit has a housing in which is enclosed a magnetic disk medium made of glass, a spindle and a spindle motor for driving the magnetic medium in rotation, a slider for supporting a magnetic head and an actuator for positioning the magnetic head. An impact force applying mechanism mounted adjacent the housing applies an impact force to the housing for manually imposing a predetermined certain impact force on the housing. By applying an impact force manually to the housing before use of the magnetic disk unit or when the disk unit becomes inoperative due to sticking, it is possible to easily eliminate the sticking phenomenon between the magnetic head and the magnetic disk medium, thus permitting operation of the magnetic disk unit.

Magnetic disk unit with an impact force applying mechanism

Configuration for implementing a control unit of a disk apparatus having functions of high-precision head positioning control and data read/write control and sophisticated interface function with a small size and a low cost. A driver control microprocessor for embedded digital servo processing has a memory of a relatively small capacity and is suited for high-speed processing and an A/D converter. An interface function control microprocessor for generalized control of an interface function device with respect to a high rank device has a memory of a relatively large capacity and is suited for low-speed processing. The driver control microprocessor and the interface function control microprocessor are mounted within a single IC package.

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Odawara, Japan

Koji Kodama