Physical Format; Shipped Format (P-List); Reassigned Format (G-List) - IBM Ultrastar 36LZX Specifications

6.0 Physical format

Media defects are remapped to the next available sector during the Format Process in manufacturing.
The mapping from LBA to the physical locations is calculated by an internally maintained table.

6.1 Shipped format (P-List)

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Data areas are optimally used.
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No extra sector is wasted as a spare throughout user data areas.
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All pushes generated by defects are absorbed by spare tracks of the inner zone.
Figure 17. P-List physical format
NOTE: Defects are skipped without any constraint, such as track or cylinder boundary. The calculation
from LBA to physical is done automatically by internal table.

6.2 Reassigned format (G-List)

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G-List is prepared for 3279 LBAs.
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Re-re-assign of the same LBA does not increase G-List entry.
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A cylinder for spare sectors is prepared every 256 physical cylinders.
NOTE: G-List entries are part of the normal maintenance work of hard disk drives. G-List entries are
possible during early drive usage and are caused mainly by handling.
Ultrastar 36LZX hard disk drive specifications
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