When you are asked to install a new 80Gb hard drive and to keep the existing 10Gb drive for data storage. There is a CD writer installed as the secondary master.

Prior to installation, plan how your new drives are to be installed.

When planning the installation of new drives, there are a few considerations to keep in mind. In this case, we have a new 80GB hard drive and an existing 10GB drive for data storage, with a CD writer already installed as the secondary master.

Here's a step-by-step plan for installing the new drives:

1. Identify the current configuration: Check how the existing drives are currently connected. Determine the cables and connectors being used, as well as the current master and slave settings.

2. Determine an appropriate configuration: Based on the information provided, we need to install the new 80GB hard drive while keeping the existing 10GB drive for data storage. Since we have a CD writer installed as the secondary master, we should use the primary IDE channel for the hard drives.

3. Define the master and slave settings: The new 80GB hard drive will be the primary master, which means it will be the main drive and connected to the end connector on the IDE cable. The existing 10GB drive will be the primary slave, connected to the middle connector on the same IDE cable.

4. Connect the new 80GB hard drive: Power down the computer and unplug it from the power source. Open the computer case and locate an available hard drive bay. Connect one end of the IDE cable to the motherboard's primary IDE connector and the other end to the back of the new 80GB hard drive. Make sure to align the pins correctly. Also, make sure to connect power to the new hard drive using a SATA or Molex power connector.

5. Connect the existing 10GB drive: Since we're using the primary IDE channel, one end of the IDE cable is already connected to the motherboard. Connect the middle connector of the same IDE cable to the back of the existing 10GB drive. Again, make sure the pins are aligned correctly. Connect power to the existing drive as well.

6. Verify the settings: Double-check that the master and slave settings are correctly set on the drives. This may involve setting jumpers or using cable select settings, depending on the specific hardware.

7. Close the computer case: Once all the connections and settings are in place, carefully close the computer case. Make sure all screws or fasteners are secured.

8. Power on and check BIOS settings: Power on the computer and access the BIOS settings. Confirm that both drives are detected by the system. If necessary, make any required adjustments in the BIOS to ensure proper recognition and boot order.

Following this plan should allow you to install the new 80GB hard drive while preserving the existing 10GB drive for data storage, with the CD writer already installed as the secondary master.