Product manual

CompactFlash Memory Card Product Manual Preliminary

6.1.8 Initialize Drive Parameters - 91H

Bit -> 7 6 5 4 3 2 1 0

Command (7)

91H

C/D/H (6)

X 0 X Drive Max Head (no. of heads-1)

Cyl High (5)

Cyl Low (4)

Sec Num (3)

Sec Cnt (2)

Number of Sectors

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.

6.1.9 Read Buffer - E4H

Bit -> 7 6 5 4 3 2 1 0

Command (7)

E4H

C/D/H (6)

X Drive X

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.