BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram showing schematically an entire configuration of a hard disk drive (HDD) according to an embodiment of the present invention.
FIG. 2 is a diagram schematically showing a data format of data written on a magnetic disk according to an embodiment of the present invention.
FIG. 3 is a block diagram showing schematically a configuration used to manage defective sectors under normal operating conditions of the HDD according to an embodiment of the present invention.
FIGS. 4(
a) to 4(c) schematically show methods of registering defective sectors in each PDM format according to an embodiment of the present invention, wherein FIG. 4(a) schematically shows a single-sector entry format, FIG. 4(b) a multi-sector entry format, and FIG. 4(c) a two-dimensional sector entry format.
FIG. 5 schematically shows an example of a PDM of the single-sector entry format according to an embodiment of the present invention.
FIG. 6 schematically shows an example of a PDM of the multi-sector entry format according to an embodiment of the present invention.
FIG. 7 schematically shows an example of a PDM of the two-dimensional sector entry format according to an embodiment of the present invention.
FIG. 8 is a diagram showing, for each PDM format according to an embodiment of the present invention, the kind of data stored in one entry and the maximum number of defective sectors that can be registered in one entry.
FIG. 9 shows an example of the number of entries that can be stored in each PDM format.
FIG. 10 is a block diagram showing schematically a configuration used to generate a PDM and register defective sectors on the PDM according to an embodiment of the present invention.
FIG. 11 is a flow chart that shows registration of defective sectors on a PDM in a SRST according to an embodiment of the present invention.