Set Features (Efh) - IBM DTCA-23240 - Travelstar 3.2 GB Hard Drive Specifications

12.26 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
C R C U N C 0 I D N
0 0 0
Figure 90. Set Features Command (EFh)
The Set Feature command establishes the following parameters which affect the execution of certain features
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
05H Enable Adaptive mode
44H 28 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
85H Disable Adaptive mode
AAH Enable read look-ahead feature
BBH 4 bytes of ECC apply on Read Long/Write Long commands
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O E M Specifications of DTCA-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
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