Identify Device Data; Exceptions In Address Offset Mode - IBM DBCA-204860 - Travelstar 4.8 GB Hard Drive Specifications

B e f o r e E n a b l e A d d r e s s O f f s e t M o d e
A r e s e r v e d a r e a h a s b e e n c r e a t e d u s i n g a n o n v o l a t i l e S e t M a x c o m m a n d .
U s e r A c c e s s i b l e A r e a
L B A 0
A f t e r E n a b l e A d d r e s s O f f s e t M o d e
T h e f o r m e r r e s e r v e d a r e a i s n o w t h e u s e r a c c e s s i b l e a r e a .
T h e f o r m e r u s e r a c c e s s i b l e a r e a i s n o w t h e r e s e r v e d a r e a .
A f t e r S e t M a x A d d r e s s C o m m a n d u s i n g t h e V a l u e R e t u r n e d b y R e a d M a x
A d d r e s s
Figure 55. Device address map before and after Set Feature

10.9.2 Identify Device Data

Identify Device data word 83 bit 7 indicates the device supports the Address Offset Feature.
Identify Device data word 86 bit 7 indicates the device is in Address Offset mode.

10.9.3 Exceptions in Address Offset Mode

Any commands which access sectors across the original native maximum LBA are rejected with error, even if
the access protection is removed by an Set Max Address command.
Read Look Ahead operation does not be carried out, even if it is enabled by Set Feature command.
R e s e r v e d A r e a
L B A R L B A M
U s e r A c c e s s i b l e R e s e r v e d A r e a
A r e a ( f o r m e r
R e s e r v e d A r e a )
L B A 0 L B A M R
U s e r A c c e s s i b l e A r e a
L B A 0
( f o r m e r U s e r A c c e s s i b l e
A r e a )
General Operation Descriptions
L B A M
L B A M
85