I am not sure what you mean by Bypassed disk,
But there are the canned reports available in Ops-Mgr for disk.
dfm report list | grep -i disk
disks summary of all disks
disks-aggr summary of disks attached to aggregates
disks-broken list of all failed disks
disks-spare list of all spare disks
disks-500 list of all 500 GB disks
disks-320 list of all 320 GB disks
disks-300 list of all 300 GB disks
disks-250 list of all 250 GB disks
disks-144 list of all 144 GB disks
disks-136 list of all 136 GB disks
disks-72 list of all 72 GB disks
disks-36 list of all 36 GB disks
disks-18 list of all 18 GB disks
disks-9 list of all 9 GB disks
disks-4 list of all 4 GB disks
disks-2 list of all 2 GB disks
disks-performance-summary performance summary of Disks
#
And these are the list of fields available for Disk catalog using which you can create a Custom Report.
dfm report catalog list Disk
Disk Catalog
Default Display Tab: PhysicalSystems
Fields:
Field Default Name Default Format