Reserved (Byte 18 Through 19); Vendor Unique Error Information (Byte 20 Through 23) - IBM Ultrastar 36LZX Specifications

12.2.11 Reserved (Byte 18 through 19)

Reserved fields are filled with zero.

12.2.12 Vendor unique error information (Byte 20 through 23)

This field gives detailed information about the error. It contains a unique code which describes where the
error was detected and which piece of hardware or microcode detected the error depending on current
operation (i.e. Power On Reset/Initialization, Read/Write operation, or SMART Alert).
12.2.12.1 Power On Reset/Initialization Error (Sense Key 02h)
While Power On Reset/Initialization is in process, Sense Key 02h "Not Ready" is a possible failure and
the Vendor Unique Error information bytes 20 and 21 will contain "POR Step" which indicates where the
failure was detected during the microcode processing, and the Vendor Unique Error information bytes
22 and 23 will contain "POR Error" which is the reason for failure.
Sense Data
Byte 20
Bit.7 Jumper Setting - Disable Auto Spin-Up
Bit.6 Format Corrupted - Degraded Mode
Bit.5 Soft Reset Occurred
Bit.4 RAM ERP Not Ready
Bit.3 Not Used
Bit.2 Not Used
Bit.1 Start Spinning
Bit.0 Initialization by Usage Table
Sense Data
Byte 21
Bit.7 RAM Table Validation
Bit.6 Head Test Processing
Bit.5 Loading Read-Only Table
Bit.4 Loading Overlay Code
Bit.3 Loading RAM Code
Bit.2 Starting Spindle Motor
Bit.1 Initiate Microcode Loading
Bit.0 Testing Sector Buffer RAM
Figure 191. Sense Data Byte 20 and 21 for POR Step
Description
Description
Ultrastar 36LZX hard disk drive specifications
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