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C141-E230 7-1
CHAPTER 7 Error Analysis
7.1 Error Analysis Information Collection
7.2 Sense Data Analysis
This chapter explains in detail how sense data collected from a disk drive is used for troubleshooting. Sense
data reflects an error in the disk drive, and helps with troubleshooting.
A sense key, additional sense code, and additional sense code qualifier, taken from various sense data are
repeated. Also in this chapter, troubleshooting is performed using these three codes. Unless otherwise
specified, "sense data" means the above three codes. When sense data is represented as (x-xx-xx), the
leftmost x is a sense key, the middle xx is an additional sense code, and the rightmost x is an additional sense
code qualifier.
7.1 Error Analysis Information Collection
7.1.1 Sense data
When HDDs post a CHECK CONDITION status, the current command or queued command is
cleared. In such a case, the HDDs generate sense data about the command-issuing INIT. The INIT
can read the sense data by reading the sense data added to the response frame of the command where
an error occurred (Auto Sense function).
7.1.2 Sense key, additional sense code, and additional sense code qualifier
If an error is detected in a disk drive, the error status is indicated in the sense data collected from the
disk drive. Figure 7.1 shows the positions of a sense key, additional sense code, and additional sense
code qualifier.