Physical Format; Shipped Format (Plist); Reassigned Format (Glist) - IBM DCAS-32160 - Ultrastar 2.1 GB Hard Drive Specifications

5.0 Physical Format

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

5.1 Shipped Format (PList)

Data areas are optimally used.
No extra sector is wasted as a spare throughout user data areas.
All pushes generated by defects are absorbed by spare tracks of inner zone.
No spare sector at each track or zone. Spare sectors are reserved after max LBA of data area.
P L i s t P h y s i c a l F o r m a t
N N + 1
Defects are skipped without any constraint, such as track or cylinder boundary. The calculation from LBA to physical
is done automatically by internal table.

5.2 Reassigned Format (GList)

252 spare sectors are available at shipment following after Max LBA of data area, and are used by Auto-
matic Defect Reallocation and Reassign Block Command.
G L i s t P h y s i c a l F o r m a t
N N + 1
M a x M a x .
L B A 4 L B A 3
Calculation from LBA to physical is done automatically by internal table.
Copyright IBM Corp. 1996
N + 2
D e f e c t D e f e c t
A
S k i p S k i p
N + 3 N + 4
D e f e c t
R e a s s i g n
M a x M a x M a x
L B A 2 L B A 1 L B A
N + 3
A
N + 6 N + 7
D e f e c t
R e a s s i g n
V V
N + 2 N + 5
S p a r e
N + 8
S p a r e
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