Changes between Version 3 and Version 4 of Howto_ReadSmartctlReports_ATA_542.1


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Timestamp:
Sep 2, 2012, 2:53:24 AM (8 years ago)
Author:
Gabriele Pohl
Comment:

UNC and LBA

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  • Howto_ReadSmartctlReports_ATA_542.1

    v3 v4  
    226226<br />
    227227<a name="UNC"></a><h4>UNCorrectable Error in Data</h4>
    228 Some SMART attributes values, that are updated only during <em>off-line data collection</em> activities are labeled "Offline" in column "UPDATED".
     228This refers to data which has been read from the disk, but for which the Error Checking and Correction (ECC) codes are inconsistent. In effect, this means that the data can not be read.
     229In the error log the Logical Block Address (<b><a href="#LBA" title="Logical Block Address"><font color="blue">LBA</font></a></b>) at which the error occurred will be printed in base 10 and base 16.
     230<a name="LBA"></a><h4>Logical Block Address</h4>
     231The LBA is a linear address, which counts 512-byte sectors on the disk, starting from zero. (Because of the limitations of the SMART error log, if the LBA is greater than 0xfffffff, then either no error log entry will be made, or the error log entry will have an incorrect LBA. This may happen for drives with a capacity greater than 128 GiB or 137 GB.) For Linux systems the smartmontools web page has <a href="http://smartmontools.sourceforge.net/badblockhowto.html" title="Bad block HOWTO">instructions</a> about how to convert the LBA address to the name of the disk file containing the erroneous disk sector.
    229232}}}