Abstract: Aspects of the present embodiment are related to a power supply voltage supply circuit and the disk apparatus that are capable of reducing power consumption in data writing and reading. The power supply voltage supply circuit includes a data processing unit writing data onto a disk medium and/or reading data from the disk medium=having a plurality of zones assigned a cylinder number, a data input-output unit transmitting data to the data processing unit at a transfer rate in accordance with the zones, a power supply voltage supply unit supplying a voltage to the data input-output unit and a control unit controlling the power supply voltage supply unit in order to supply the voltage in accordance with the transfer rate.

Abstract: According to one embodiment, a power supply voltage adjustment circuit includes a determination module and a voltage controller. The determination module determines whether a head is positioned on a data area specified by a command received from a host based on the relationship between the position of the head and the command. The head reads data from or writes data to an information recording medium. When the head is determined not to be positioned on the data area specified by the command, the voltage controller adjusts a target control value of a power supply voltage supplied to a read channel that exchanges information with the head according to a timing from a time point when a servo mark on the information recording medium is detected.

Abstract: Aspects of the present embodiment are related to a power supply voltage supply circuit and the disk apparatus that are capable of reducing power consumption in data writing and reading. The power supply voltage supply circuit includes a data processing unit writing data onto a disk medium and/or reading data from the disk medium=having a plurality of zones assigned a cylinder number, a data input-output unit transmitting data to the data processing unit at a transfer rate in accordance with the zones, a power supply voltage supply unit supplying a voltage to the data input-output unit and a control unit controlling the power supply voltage supply unit in order to supply the voltage in accordance with the transfer rate.

Abstract: A memory apparatus adding a non-volatile memory based on the T13 proposal to a storage medium controller controlling read/write operations of data between a host computer and a storage medium through a volatile memory without an accompanying increase in the number of pins or increase in size, which memory apparatus further introduces an interface control function unit which controls interfacing for compatibility with a volatile memory (SDRAM) and is configured to support the function of control of the non-volatile memory (flash memory) through a volatile memory controller in a storage medium controller.

Abstract: Prior to the loading of a main program, the rotation speed of a disk provided in a hard disk drive is increased to a common rotation speed adapting to all types of hard disk drive. At the common rotation speed and a common recording density, a main program is read from a system area in the disk where the main program is recorded. The main program is written to a RAM provided in a hard disk controller. After control processing of the hard disk drive is handed over to the main program, the rotation speed of the disk is increased to a proper rotation speed for a device. This allows main programs to be loaded in a common way from disks provided in respective hard disk drives independent of the type thereof.

Abstract: In a data processing device, a processor processes data based on a stored program and a buffer manager accesses the data. The data processing device includes a program memory which stores program codes, the program codes being loaded into the program memory and executed by the processor when processing the data. A shared memory stores one of the program codes and the data. A control unit selectively connects one of the processor and the buffer manager to the shared memory based on a select pattern, wherein the shared memory functions to store the program codes when the select pattern is set in a first condition, and the shared memory functions to store the data when the select pattern is set in a second condition.

Abstract: Prior to the loading of a main program, the rotation speed of a disk provided in a hard disk drive is increased to a common rotation speed adapting to all types of hard disk drive. At the common rotation speed and a common recording density, a main program is read from a system area in the disk where the main program is recorded. The main program is written to a RAM provided in a hard disk controller. After control processing of the hard disk drive is handed over to the main program, the rotation speed of the disk is increased to a proper rotation speed for a device. This allows main programs to be loaded in a common way from disks provided in respective hard disk drives independent of the type thereof.

Abstract: An illegal instruction processing method is adapted for a processor which executes programs, and detects execution of an illegal instruction and carries out a retry from an instruction immediately prior to the illegal instruction when the execution of the illegal instruction is detected.

Abstract: A storage apparatus comprises a CPU that provides read/write control of data from/into a magnetic disk, a PLL circuit that generates clock signals having different frequencies, and a selector which selects a clock signal from among the clock signals generated by the PLL circuit according to a control status of the CPU.

Abstract: In a data processing device, a processor processes data based on a stored program and a buffer manager accesses the data. The data processing device includes a program memory which stores program codes, the program codes being loaded into the program memory and executed by the processor when processing the data. A shared memory stores one of the program codes and the data. A control unit selectively connects one of the processor and the buffer manager to the shared memory based on a select pattern, wherein the shared memory functions to store the program codes when the select pattern is set in a first condition, and the shared memory functions to store the data when the select pattern is set in a second condition.

Abstract: An index determining unit determines that a current position in a disk medium corresponds to a true index when reaching a true index pattern of servo information recorded in the disk medium. The determination is used for reading predetermined servo information so as to perform a servo control operation of a disk reading/writing head. The disk medium has the true index pattern in a first portion of the disk medium and also untrue index patterns of servo information in a predetermined number of second portions in proximity to the first portion along a track direction. The true index pattern and the untrue index patterns form a predetermined sequence.