INFORMATION RECORDING DEVICE and DATA-FLOW CONTROLLER FOR THE DEVICE

Provided are an information recording device and a data flow controlling method of the same for transferring only an error-corrected sub-unit constituting a part of corrected data when the corrected data is to be returned from error correction means to an external buffer. As solving means, an information recording device records on a recording medium data obtained by adding a correction code to user data of a plurality of bytes transferred from a higher-level device, corrects an error in the data read from the recording medium by use of the correction code, and transfers the user data to the higher-level device. The information recording device includes: an external buffer for temporarily storing the data read from the recording medium; error correction means which corrects an error in the data transferred from the external buffer to generate corrected data, which divides the corrected data into a plurality of sub-units, and which adds a transfer flag to the sub-units including the corrected data; and data flow means which transfers to the external buffer only a sub-unit having the transfer flag added thereto when the corrected data is to be transferred from the error correction means to the external buffer, and which rewrites only a part corresponding to the sub-unit in the data stored in the external buffer.