IBM IC35L036UWDY10 Hard Drive Specifications - Page 241

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 (that is, Bring-up operation, Read/Write operation, or SMART Alert). 12.2.12.1 Power On Reset/Initialization Error (Sense Key 02h) For failures in the bring-up operation the Vendor Unique Error information bytes 20 and 21 will contain "POR Step" which indicates where the failure was detected, 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 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Description Jumper Setting - Disable Auto Spin-Up Format Corrupted - Degraded Mode Soft Reset Occurred RAM ERP Not Ready Not Used Not Used Start Spinning Initialization by Usage Table Figure 208. Sense Data Byte 20 for POR STEP Sense Data Byte 21 Description Bit 7 Bit 6 RAM Table Validation Head Test Processing Bit 5 Loading Read-Only Table Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Loading Overlay Code Loading RAM Code Starting Spindle Motor Initiate Microcode Loading Testing Sector Buffer RAM Figure 209. Sense Data Byte 21 for POR STEP Ultrastar 146Z10 hard disk drive specifications 225