You can perform data preparation by using the Select Key button. This operation converts clear data on a disk to encrypted data by using an existing disk key.
To perform data preparation on a clear disk using an existing key option, follow these steps:
1. Select the disk and click Manage Disk Encryption.
a. In the Manage Disk Encryption: Settings screen, click Change disk encryption status.
b. The Current Status will be Clear. Select the required action Encrypt from the Action drop-down list.
c. For data preparation, ensure that the Prepare Data check box is checked.
d. Click Select Key and select a key from the drop-down list.
2. Click Confirm in the next screen.
The percentage of the disk preparation is displayed. Wait until the status shows 100%.
When the data preparation is completed successfully, the disk status turns to Crypto.