Set Max Address (F9H) - IBM DBCA-204860 - Travelstar 4.8 GB Hard Drive Specifications

12.27 Set Max Address (F9h)

C o m m a n d B l o c k O u t p u t R e g i s t e r s
R e g i s t e r
D a t a
F e a t u r e
S e c t o r C o u n t
S e c t o r N u m b e r
C y l i n d e r L o w
C y l i n d e r H i g h
D e v i c e / H e a d
C o m m a n d
E r r o r R e g i s t e r
7 6 5
C R C U N C 0 I D N
0 0 0
Figure 96. Set Max Address (F9h)
This command overwrites the max LBA/CYL of H D D in a range of actual device capacities. Once device
receives this command, all accesses beyond that LBA/CYL are rejected with setting ABORT bit in status
register. Identify device command and Identify device D M A command returns the LBA/CYL which is set
via this command as a default value.
Read Native Max Address command should be issued and completed immediately prior to issuing Set Max
Address command. If the device receives Set Max Address command without a prior Read Native Max
Address command, the device aborts the Set Max Address command.
In CHS mode,Cylinder High,Cylinder Low specify the max cylinder number. The Head number of
DEVICE/HEAD and Sector Number are ignored. The default value(See default CHS in Identify device
information) is used for that.
In LBA mode,the Head number of DEVICE/HEAD , Cylinder High, Cylinder Low and Sector Number
specify the max LBA. This command will be set this LBA sa the max LBA of the device.
Output Parameters To The Device
B Option bit for selection whether nonvolatile or volatile. B = 0 is volatile condition.
When B = 1 , MAX LBA/CYL which is set by Set Max Address command is pre-
served by P O R and H A R D RESET. When B = 0 , MAX LBA/CYL which is set by
Set Max Address command will be lost by P O R and H A R D RESET. B = 1 is not
valid when the device is in Address Offset mode, and the command is aborted.
7 6 5 4 3 2 1 0
B
V V V V V V V V
V V V V V V V V
V V V V V V V V
1 L 1 D H H H H
1 1 1 1 1 0 0 1
4 3 2 1 0
0 A B T T 0 N A M N
0 0 V 0 0
C o m m a n d B l o c k I n p u t R e g i s t e r s
R e g i s t e r 7 6 5 4 3 2 1 0
D a t a
E r r o r . . . S e e B e l o w . . .
S e c t o r C o u n t
S e c t o r N u m b e r V V V V V V V V
C y l i n d e r L o w V V V V V V V V
C y l i n d e r H i g h V V V V V V V V
D e v i c e / H e a d
S t a t u s . . . S e e B e l o w . . .
S t a t u s R e g i s t e r
7 6 5 4 3
B S Y R D Y D F D S C D R Q C O R I D X E R R
0 V 0
Command Descriptions
H H H H
2 1 0
0 V
143