SanDisk SDP3B - Initialize Drive Parameters - 91 H; Read Buffer - E4 H

SDP3B FlashDisk Product Manual
SanDisk SDP3B FlashDisk Product Manual © 1998 SANDISK CORPORATION 65
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) X
Cyl Low (4) X
Sec Num (3) X
Sec Cnt (2) Number of Sectors
Feature (1) X
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 SDP3B
FlashDisk is “Formatted” with one head and
sector per track value, the same SDP3B
FlashDisk 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) X
Cyl Low (4) X
Sec Num (3) X
Sec Cnt (2) X
Feature (1) X
The Read Buffer command enables the host to
read the current contents of the SDP3B
FlashDisk’s sector buffer. This command has the
same protocol as the Read Sector(s) command.