Integral Peripherals, Inc.

Storage Technology Corporation

Amcodyne Incorporated

Integral Peripeherals, Inc.

James F Hopper

John H Blagaila

Michael R Utenick

James H Morehouse

Steven Bernard Volk

David M Furay

James A Dunckley

Thomas A Klein

Nicholas J Bucska

Disclosed is a rigid disk drive information storage device which includes a rigid disk having a diameter in the range of about 45-50 mm., with a housing having a footprint that includes a width of about 51 mm. and utilizing a rotary actuator for positioning read/write recording elements across the surface of the disk. The disk storage devices further includes a footprint with a length of about 70 mm., includes dynamic loading apparatus for loading the read/write recording elements into operative relationship with the disk and further includes an inertial latch for preventing rotation of the actuator when the drive is subjected to a rotational force.

Miniature hard disk drive with EMI protection and single permanent

An embedded servo system for a disk drive is disclosed. An asymmetrical position sub-field reduces the overhead of the disk position system. The sub-field includes at least two normal frame pairs and only one quadrature frame pair interleaved with one of the normal pairs to form the asymmetrical position sub-field. The prerecorded embedded servo information in each track of the disk includes a multiplicity of different length servo fields, i.e, each track includes at least two types of servo fields where the first type has a first length and the second type has a second length that is different from the first length. The length of a servo field refers to the number of prerecorded bytes in the servo field. The multiplicity of different length servo fields includes a first type having a full track address sub-field and a second type having a modulo track address sub-field in place of the full track address sub-field. In another embodiment, the multiplicity of different length servo fields includes the first and second types of servo fields and a third type of servo field. The third type of servo field includes only track following information and no track address information, i.e., the third type of servo field is a position only servo field. The servo fields of differing lengths are interleaved in each track of the disk. The servo fields are chosen to provide a high seek sampling rate in comparison to the required performance and a reduction in the servo overhead. Increased track following sampling is provided to make the read/write head less likely to move off track in response to external forces on the disk drive. Disk drives with different types of servo fields interleaved are particularly well-suited for small portable computers.

Disk drive embedded servo system having a servo field with an

Disclosed is a disk drive information storage device having a housing and a disk means for recording and reproducing information. The disk drive information storage device utilizes an actuator comprising a body portion supported by the housing for rotation about an axis, and a load beam connected to the body portion for rotation of a first end of the load beam in a plane substantially parallel to a surface of the disk means. The load beam includes an elongated lift tab having a free end which extends beyond the first end of the load beam, with the lift tab extending along an axis which is skewed from the centerline of the load beam. A slider body including a transducer for recording and reproducing information from the disk is supported by the load beam at a position intermediate the first end of the load beam and the axis of rotation of the body portion. A cam assembly is provided on the housing adjacent to the edge of the disk means, the cam assembly including a cam surface positioned in operative relationship with the lift tab. In one embodiment, the housing has a first external dimension of about 51 mm. In another embodiment, the disk means has a diameter in the range of from about 45 mm to about 50 mm.

Miniature disk drive with dynamic head loading with skewed lifting tab

In an embedded servo system for a disk drive, prerecorded servo information in each track of the disk includes a multiplicity of different length servo fields. Each track includes at least two types of servo fields where the first type and the second type have different lengths. The length of a servo field refers to the number of prerecorded bytes in the servo field. The multiplicity of different length servo fields includes a first type having a full track address sub-field and a second type having a modulo track address sub-field in place of the full track address sub-field. One embodiment includes the first and second types of servo fields and a third type of servo field. The third type of servo field includes only track following information and no track address information. The servo fields of differing lengths are interleaved in each track of the disk. The servo fields are chosen to provide a high seek sampling rate in comparison to the required performance and a reduction in the servo overhead. Increased track following sampling is provided to make the read/write head less likely to move off track in response to external forces on the disk drive. Disk drives with different types of servo fields interleaved are particularly well-suited for small portable computers.

Servo field scheme for high sampling rate and reduced overhead embedded

Disclosed is a disk drive information storage device which includes a disk for recording and reproducing information, with the disk drive information storage device having a housing with a baseplate which includes a peripheral portion having a lip which extends circumferentially around the peripheral portion and the cover also includes a peripheral portion with a free edge at the periphery of the cover such that when the baseplate is engaged with the cover the overlap of the free edge of the baseplate and the free edge of the lip provides shielding to the internal components of the disk drive from electromagnetic interference, which my be present in the environment in which the disk drive is utilized. The disk utilized in the disk drive has a diameter in the range of from about 45 mm to about 50 mm. The housing of the disk drive has a first external dimension of about 51 mm and a second external dimension of about 70 mm.

Disk drive information storage device with baseplate and cover having

Disclosed is a disk drive information storage device which, in one embodiment, includes a disk having a diameter in the range of about 45 to 50 min., with a housing and a spin motor. In another embodiment, the disk drive information storage device includes a disk, a housing having a first external dimension of about 51 mm., and a spin motor. The spin motor includes a rotor and a stator, with either the rotor or the stator having a plurality of winding structures associated therewith, and the other having a plurality of magnetic poles. Each winding structure is made up of two winding portions, with only one winding portion being used to drive the rotor relative to the stator upon drive currents being applied to the winding structure, but with both winding portions being used to generate back electromotive force when drive current is cut off from the winding structure. This generated electromotive force is used to actuate an actuator drive motor to unload the read/write heads from the disk surface. As an alternative, each winding is made of a single winding, and the winding structures are used successively to drive the motor relative to the stator, but with at least two winding portions generating back electromotive force when drive current is cut off. The housing of the disk drive information storage device, in one embodiment, further includes a second external dimension of about 70 mm. and a dynamic loading apparatus for loading the read/write recording elements into the operative relationship with the disk.

Miniature hard disk drive with spin motor for portable computer

An apparatus is provided for removing invalid read signal peaks which are detected during a disk read operation. In one embodiment, the apparatus converts the analog read-back signal from the disk into a pair of signals, a raw data signal being indicative of the signal peaks read from the disk and a raw polarity signal being indicative of the polarity of such peaks. The raw data signal is inputted to a phase lock loop, which outputs a strobe signal. The raw data signal and the raw polarity signal are made synchronous with the strobe signal in a reclocking circuit. The data and polarity signals outputted by the reclocking circuit are synchronously applied to a qualifying circuit, the output therefrom being free of invalid data.

Method and apparatus for qualifying data

An address mark detection circuit for use in a magnetic disk data storage unit is disclosed which features a Mealy sequential machine for providing a sequence of logical steps for the testing of sampled data in the search for an address mark; comparison between a given address mark and sampled data is eliminated. In a preferred embodiment, the specific mark to be detected is a first high frequency field followed by a second lower frequency field. The data is repeatedly sampled, and a digital frequency detector is used to provide a two bit signal to the sequential machine for stepping it in a direction corresponding to the frequency of the sample. The circuit allows elimination of means for detection of rotational position sensing information from a dedicated disk surface and elaborate phase-locked-loop circuitry for generating a data rate clocking signal in favor of simple and reliable logic circuitry.

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Louisville, CO, United States of America

James F Hopper