The screenshot shows the OUI Specify Oracle Cluster Registry (OCR) Location window. The introductory text on this windows says "The Oracle Cluster Registry (OCR) stores cluster and database configuration information. Specify a cluster file system file or a shared raw device containing at least 256MB of free space that is accessible from all of the nodes in the cluster."
There are two available options to choose for OCR Configuration. The first option, Normal Redundancy, is followed by the text "Choose this option to enable the Oracle Clusterware to manage OCR mirroring. You will need an additional 100 MB of disk space for the mirrored copy." The second option, External Redundancy, is followed by the text "Choose this option if you are using your disk management system to provide OCR redundancy". The screenshot shows the Normal Redundancy option as selected.
Below the OCR Configuration options section, the Specify OCR Location text entry field contains the value /dev/sda1. The Specify OCR Mirror Location field has the value /dev/sdb1.
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At the bottom of the screenshot are the following buttons, from left to right: Help, Installed Products, Back, Next, Install (grayed out), and Cancel.