Configuring an unassigned drive as the verification drive  260  IBM TS4500 R6 Tape Library Guide Figure 4-90 Verification drives After all of the required drives are set, the drives display as verification drives, as shown in  Figure 4-90. Figure 4-89 Drive configuration for media verification A warning message appears to inform you that this drive will not be available for media  access and it will not be visible to hosts. This drive can be used for media verification only, as  shown in Figure 4-89. Repeat this task for all drives that you configure for media verification. To configure an unassigned drive for media verification, from the main menu, select  Drives Drives by Logical Library , select  Unassigned drives , and select the drive from the list to  use as a verification drive. 