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Defect Descriptors of Block Format

Index Format (100b)

Index pulse describes start position of each track on the drive. The first four bytes of Index format contain defect

cylinders and defect heads.

Defect Descriptors of Index Format

（MSB）

Cylinder Number of Defect Block

（LSB）

Heads

（MSB）

Defect Position Bytes after Index

（LSB）

The rest 4 bytes contain defect position came from index and measured by Byte. If the value is FFFFFFFFh in the

first 4 bytes, we consider the whole disk to be damaged. Because drives support different sector length, only

index format can be used for defect list format (that is PList) by HDD vendors.

FFFFFFFFh is often considered as -1, it corresponds to the interpretation of signed int. Although -1 is easier than

FFFFFFFFh in pronunciation, the number digit is not clear.

（MSB）

Block Number of Defect Block

（LSB）

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 52 53

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Seagate ST39251LC Manuale Utente Pagina 44