Defect Descriptor; Figure 52. Defect Descriptor - Block Format - IBM IC35L036UWDY10 - Ultrastar 36.7 GB Hard Drive Specifications

1. The drive cannot locate a required defect list nor determine that the list exists.
2. The drive encounters an unrecoverable error while accessing a required defect list.
! IP (Initialization Pattern) bit must be set to zero. The drive initializes all data with zeros.
! DSP (Disable Saving Parameters) bit must be set to zero. The drive saves all the MODE SELECT
savable parameters during the format operation.
! Immed (Immediate) bit set to zero requests that status be returned at the end of the format operation.
An immediate bit set to one requests that status be returned immediately. GOOD Status is returned
following the CDB validation and transfer of data in the DATA OUT phase. If the immediate format
operation terminates in error, Deferred Error Sense data is generated. With the immediate bit set to
one, the Link bit must be set to zero.

8.4.2 Defect descriptor

The Defect List Length field specifies the total length in bytes of the defect descriptors that follow. The
drive has an implementation limitation for the number of defect descriptors. The number of defect
descriptors shall be less than 128. The defect list length must be equal to four times the number of defect
descriptors to follow for the BLOCK format or eight times the number of defect descriptors to follow for the
BYTES FROM INDEX and PHYSICAL SECTOR format. Otherwise the command is terminated with
CHECK CONDITION STATUS, the sense key is set to ILLEGAL REQUEST, and the additional sense
code is set to INVALID FIELD In PARAMETER LIST. The defect descriptors must specify the defect
based on the current Format Device parameters reported by the MODE SENSE command.
The drive supports three Defect List formats.
8.4.2.1 Block format
The Block format of the defect list supported by the drive is by logical block where the location of defective
sectors is given by their LBA.
Byte
7
(MSB)
0
1
2
3
4n -
4n +3

Figure 52. Defect descriptor - Block format.

Format of the defect list sent during the DATA OUT phase when FmtData set to one.
Bit
6 5 4
Defective Logical Block Address
Defective Logical Block Address n
Ultrastar 146Z10 hard disk drive specifications
3 2 1
53
0
(LSB)