To do so first login as a root user.

Let us assume the iso image name is disk-test.iso

Step # 1: First you need to create a directory /mnt/iso

# mkdir /mnt/iso

Step # 2: mount the iso image to directory /mnt/iso

# mount -o loop disk-test.iso /mnt/iso

Step # 3: To view the mounted iso image data

# cd /mnt/iso