Set Features (Efh) - IBM DTNA-22160 - Travelstar 2.1 GB Hard Drive Specifications

12.25 Set Features (EFh)

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
B B K U N C 0 I D N
0 0 0
Figure 80. Set Features Command (EFh)
The Set Feature command is to establish the following parameters which affect the execution of certain fea-
tures as shown in below table.
ABT will be set to 1 in the Error Register if the Feature register contains any undefined values.
Output Parameters To The Device
Feature Destination code for this command.
02H Enable write cache (Warning.1)
03H Set transfer mode based on value in sector count register
44H 22 bytes of ECC apply on Read Long/Write Long commands
55H Disable read look-ahead feature
66H Disable reverting to power on defaults
82H Disable write cache
AAH Enable read look-ahead feature
BBH 4 bytes of ECC apply on Read Long/Write Long commands
CCH Enable reverting to power on defaults
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O E M Specifications of DTNA-2xxxx 2.5 inch H D D
7 6 5 4 3 2 1 0
V V V V V V V V
N o t e . 1
1 1 D
1 1 1 0 1 1 1 1
4 3 2 1 0
0 A B T T 0 N A M N
0 0 V 0 0
Warning 1. Hard reset or power off must not be done in 5 seconds after write
command completion when write cache is enabled.
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
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
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
2 1 0
0 V