Information recording device, data-flow controller for the device, and control method for the data-flow

Abstract

An information recording device for transferring error-corrected subunits only partially, when the corrected data is returned from error correcting means to an external buffer, and a data-flow controlmethod for the device. The information recording device records the data, in which a correction code is added to user data of plural bytes transferred from a host device, in a recording medium, corrects an error of the data read from the recording medium, with the correction code, and transfers the user data to the host device. The information recording device comprises an external buffer for temporarily storing the data read from the recording medium, error correcting means for correcting the error of the data transferred from the external buffer thereby to create the correction data, and for dividing the corrected data into a plurality of subunits thereby to attach a transfer flag to the subunits containing the corrected data, and data-flow means for transferring only the subunit havingthe transfer flag attached thereto, to the external buffer when the corrected data is sent from the error correcting means to the external buffer, and for rewriting only the portion of the subunits of the data stored in the external buffer.

Description

technical field [0001] The present invention relates to data flow control of an information recording device that efficiently transfers data recorded on a recording medium. [0002] More specifically, the present invention relates to an LTO (Linear Tape Open) type tape drive for efficiently transferring error correction data from an ECC engine to an external buffer, its data flow controller, and its data flow control method. Background technique [0003] In recent years, the demand for information recording devices has been increasing due to the advancement of digitalization of society, and the increase in capacity and recording density of information recording devices has been rapidly progressing. In an actual use environment, a large-capacity information recording device requires high-speed transmission of a large amount of data from a higher-level device (host) as needed. [0004] In particular, a magnetic tape drive occupies an important position as a large-scale buffer...

AI Technical Summary

Problems solved by technology

However, in Patent Document 1, all transfers are performed to the external buffer by burst transfer regardless of the presence or absence of error correction data, so the data transfer efficiency between the iterative code error correction device and the external buffer has not yet been improved.

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