The following two KB solutions show reasons why false physical disk alerts appear in ControLCenter
emc229380 (similar to the solution mentioned by Yousef)
Fixes to Solution Enabler code was added to 7.3.1 to stop these false disk alerts from appearing in ControlCenter
Upgrade to Solutions Enabler version 7.3.1 with Hotfix 1646 (above version 188.8.131.52 review emc279555)
If you already have Solutions Enabler version 7.3.1 applied and checked the above solutions.
Open an SR with ControlCenter Support and they can look into the issue for you