Abstract: Approaches for an emergency power off (EPO) power island, for saving critical data to non-volatile memory in the event of an EPO condition, for use in a hard-disk drive (HDD) storage device. The EPO power island includes a controller for detecting an EPO condition. A voltage regulator supplies power from spindle motor back EMF only to the EPO power island and to the non-volatile memory. Thus, the remainder of the hard drive controller (HDC) is isolated from the EPO power island so that it will not corrupt the data as the HDC's power supply is decaying. Using the power provided by the voltage regulator, the EPO power island transfers critical data from a memory internal to the island to a non-volatile memory external to the island, such as to a flash memory chip.

Abstract: Embodiments of the present invention provide techniques for detecting and correcting encoded data. In one embodiment, a system for detecting and correcting errors in a plurality of data bits comprises a static memory configured to store a plurality of data bits; a systematic encoder configured to convert the plurality of data bits into a codeword; a systematic parity check encoder configured to convert the codeword into a syndrome; and a syndrome decoder configured to evaluate the syndrome based on preset criteria used to determine whether the syndrome corresponds to an uncorrectable error. A binary [16, 8, 5] code is used to encode the plurality of data bits.

Abstract: Embodiments of the present invention provide techniques for detecting and correcting encoded data. In one embodiment, a system for detecting and correcting errors in a plurality of data bits comprises a static memory configured to store a plurality of data bits; a systematic encoder configured to convert the plurality of data bits into a codeword; a systematic parity check encoder configured to convert the codeword into a syndrome; and a syndrome decoder configured to evaluate the syndrome based on preset criteria used to determine whether the syndrome corresponds to an uncorrectable error. A binary [16, 8, 5] code is used to encode the plurality of data bits.