Introduction:

This DC-290 card is an enhanced IDE controller.
This card will support enhanced IDE hard drives as well as ATAPI CD-ROMs and
other ATAPI devices.

There is much confusion surrounding Enhanced IDE. Here is some important 
information on enhanced IDE and how it relates to using this card:

Motherboard BIOS:  The capabilities of your Motherboard BIOS determine what
you can use this card for, as well as how you will use it. Your BIOS probably
breaks down into one of two categories: 
1. One that has LBA Support and supports 4 hard drives
2. One that does not have LBA Support and supports only 2 hard drives

LBA Support: Logical Block Addressing support enables your operating system
to see the entire capacity of a drive bigger than 528MB.
4 Hard Drive Support: Supports 2 hard drives on the primary IDE channel, as
well as 2 on the secondary channel.

If your system was made before 1995, chances are good that you do not have
LBA support or support for 4 hard drives. On the other hand, if your system
was made after 1995, your BIOS should have LBA and 4 hard drives support.
To find out, enter your CMOS Setup on bootup. With some systems this is done
by pressing delete, [cntrl]+esc, or F2...
Once in the Setup, there should be an option such as "Standard Setup". In
this screen, you should see the setup for the floppy drives, hard drives, ect.
If there is support for only 2 hard drives, C and D, in this screen, your
system probably DOES NOT support LBA. If there is support for 4 hard drives
in this screen, your system most likely DOES support LBA. 

If your system DOES support LBA and 4 Hard Drives:  It is enhanced IDE
compatible. You will use the autodetect function in your CMOS to detect the
hard drive parameters. The only functions that the drivers for this card will
serve in this case is for compatibility with certain operating systems and
speed enhancement.

If your system DOES NOT support LBA and 4 Hard Drives: It is not enhanced IDE
compatible and only supports a maximum of 528MB on 2 hard drives. In this
case, the drivers for this card are used to access the full capacity of
drives other than the C: drive. The C: drive is limited to 528MB because the
C: (boot) drive needs to be setup in the BIOS in order for the system to boot,
however, the CMOS only supports 528MB. Once the system boots, however, the
drivers can be loaded to control the other drives, so those drives are not
setup in your CMOS Setup. In the CMOS, only the C: drive is setup,the others
are set to "not installed" or "none".  So, with this type of BIOS, you can
control: a C: (boot) drive with a capacity of 528MB or less, plus 3 other
hard drives of any capacity...

There are ways to get around the <528MB limitation on your boot drive if you
have a BIOS that does not support LBA. One would be a BIOS upgrade for the
motherboard (contact your system vendor). The other would be software that
comes with the hard drive for this purpose (contact hard drive vendor).
Another way would be to use a card with an ON-BOARD BIOS. Basically this
card would provide the LBA support that your motherboard CMOS lacks, thereby
allowing the system to function as if it had a Motherboard BIOS that supports
LBA (the DC-290 DOES NOT have an On-Board BIOS).

So, in general if your BIOS supports LBA (type 1 above), you use the BIOS on
the motherboard to setup your hard drives.
If your BIOS is type 2 above, you only setup drive C: in your CMOS Setup and
use the drivers for this card to control the other drives.