Error Message:

You have asked Setup to remove the partition name on computer name. To delete this partition, press L. WARNING: All data on the partition will be lost! To return to the previous screen without deleting the partition, press ESC.

Explanation:

If you delete a partition, all the data on that partition is deleted.

User Action:

Press L to delete the partition. Press Esc to return to the previous screen without deleting the partition.