Efficient multichannel data format using variable-length headers

摘要

In one embodiment, a computer-implemented method includes writing a data set to a first write section of a magnetic medium and rewriting at least some of the data set as rewritten CWI-4 sets to a rewrite section of the magnetic medium. The data set includes a plurality of sub data sets, each sub data set including a data array organized in rows and columns. Each row of the data array includes four interleaved C1 codewords (a CWI-4). A first portion of the data set is stored as CWI-4 sets to the first write section of the magnetic medium with first headers. Each rewritten CWI-4 set is stored to the rewrite section of the magnetic medium as a number of rewritten CWI-4s having corresponding rewrite headers. Also, a length of any one of the rewrite headers is greater than a length of any one of the first headers.

主权项

1. A computer-implemented method, comprising:
writing a data set to a first write section of a magnetic medium, the data set comprising a plurality of sub data sets, each sub data set comprising a data array organized in rows and columns, each row of the data array comprising four interleaved C1 codewords (a CWI-4), wherein a first portion of the data set is stored as CWI-4 sets to the first write section of the magnetic medium with first headers, a CWI-4 set comprising a fixed number of M concurrently written CWI-4s having M corresponding first headers; and rewriting at least some of the data set as rewritten CWI-4 sets to a rewrite section of the magnetic medium, wherein each rewritten CWI-4 set is stored to the rewrite section of the magnetic medium as M rewritten CWI-4s having M corresponding rewrite headers, wherein the rewritten CWI-4 sets are determined based on errors being detected in CWI-4s stored in the first write section of the magnetic medium, and wherein a length of any one of the rewrite headers is greater than a length of any one of the first headers.