5. After making that configuration change to the drive, you see a new icon in front of it to  show you the new role (Figure 8-6). Note:  The MVD flag for a tape drive is a global setting, which means that after it is  assigned, the drive keeps its role as an MVD even it is unassigned and then assigned to a  new logical library. Unassigning does not disable this role. To unassign a drive from being an MVD, follow the same procedure again, and select (after  the right-click)  Use for Media Access . This action changes the drive role back to normal  operation for the attached host application to this logical library. Figure 8-7 shows you the TS4500 web interface dialog box for enabling automatic media  verification on an existing logical library. You must go to the Cartridges by Logical Library  page. Then, select  Modify Media Verification  for the selected logical library. The Automatic  Media Verification dialog box opens where you can enter the media verification schedule. By using this dialog box, you can enable/disable an automatic media verification schedule.  Then, you can configure how often the media should be verified and the first verification date.  Finally, you can select the MVDs, which are selected by the library to perform the scheduled  media verification test. Figure 8-7 Modify Media Verification dialog box to set up a schedule Figure 8-6 Display a tape drive as the media verification drive through the TS4500 web interface 262  IBM Spectrum Archive Enterprise Edition V1.2.6: Installation and Configuration Guide