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ATA Command Description
5.1.8. Initialize Drive Parameters—91H
Bit ->
7
Command (7)
C/D/H (6)
X
Cyl High (5)
Cyl Low (4)
Sec Num (3)
Sec Cnt (2)
Feature (1)
This command enables the host to set the number of sectors per track and the number of heads per cylinder. Only the
Sector Count and the Card/Drive/Head registers are used by this command.
NOTE: SanDisk recommends NOT using this command in any system because DOS determines the offset to the
Boot Record based on the number of heads and sectors per track. If a CompactFlash Memory Card is
"Formatted" with one head and sector per track value, the same CompactFlash Card will not operate
correctly with DOS configured with another heads and sectors per track value.
5.1.9. Read Buffer—E4H
Bit ->
7
Command (7)
C/D/H (6)
Cyl High (5)
Cyl Low (4)
Sec Num (3)
Sec Cnt (2)
Feature (1)
The Read Buffer command enables the host to read the current contents of the CompactFlash Memory Card's sector
buffer. This command has the same protocol as the Read Sector(s) command.
5-10
Table 5-11. Initialize Drive Parameters
6
5
4
91H
0
X
Drive
Number of Sectors
Table 5-12. Read Buffer
6
5
4
E4H
X
Drive
®
CompactFlash
Memory Card Product Manual, Rev. 10.0 © 2002 SANDISK CORPORATION
3
2
Max Head (no. of heads-1)
X
X
X
X
3
2
X
X
X
X
X
X
1
0
1
0
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