Defect Descriptor - IBM DDRS-39130 - Ultrastar 9.1 GB Hard Drive Specifications

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 fol-
lowing the CDB validation and transfer of data in the Data Out phase. If the immediate format opera-
tion terminates in error, Deferred Error Sense data is generated. With the immediate bit set to one, the
Link bit must be set to zero.

7.4.2 Defect Descriptor

The Defect List Length field specifies the total length in bytes of the defect descriptors that follow. The
Target has an implementation limitation for number of defect descriptors. The number of defect descriptor
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
F R O M INDEX and PHYSICAL SECTOR format, otherwise the command is terminated with Check Con-
dition 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 parame-
ters reported by the Mode Sense command.
The Target supports three Defect List formats.
7.4.2.1 Block Format
The Block format of the defect list supported by the file is by logical block where the location of defective
sectors is given by their LBA.
Byte
7 6
0 (MSB)
1
2
3
4n -
4n + 3
Figure 57. Defect Descriptor - Block Format. Format of the defect list sent during the data out phase when FmtData
set to one.
7.4.2.2 Bytes From Index Format
Each defect descriptor for the Bytes From Index format specifies that the sector containing this byte be
marked defective. The defect descriptor is comprised of the cylinder number of the defect, the head number
of the defect, and the defect bytes from index.
68
O E M Spec. of DDRS-3xxxx
Bit
5 4 3
Defective Logical Block Address
Defective Logical Block Address n
2 1 0
(LSB)