If you have identified any unknown or not required or unwanted disk-group which is actually because some drive still holding the metadata of that disk-group you are seeing this.
Delete this Disk-group either by using disk-group name or serial number of disk-group
# remove disk-groups <Disk-group_name>
That will make the drive in AVAIL state like a new drive
Hope this helps!
Regards
Subhajit
I am an HPE employee
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