Shingled magnetic recording (SMR) disk drive with verification of written data
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United States of America Patent
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Mar 4, 2014
Grant Date -
Jun 13, 2013
app pub date -
Dec 12, 2011
filing date -
Dec 12, 2011
priority date (Note) -
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Abstract
A “write-squeeze-verify” method is used for verification of the data that has been written in the annular bands of a shingled magnetic recording disk drive. The writing of data along a track overwrites a portion of the previously written track and thus “squeezes” the data of the previously written track to thereby form a “shingled data track” (SDT). The data in each SDT is read back and verified by an error correction check using error correction bits associated with the data written in the SDT, or by comparing the readback data with the data stored in memory. If the data read back is not verified, a write error counter is incremented and a write error frequency is calculated. One or more attempts to write the data can be performed. If the data in the SDT cannot be verified after the attempted rewrite(s), then a “re-try fail” is reported.
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