Its own card rather than folded into Storage: Storage is per volume and this is per physical device, and one drive can back several volumes or none the operator sees, so the two do not share a key.
Rows sort failure-first, then unknown, then OK. A failing drive must not sit below the fold on a multi-disk box, and a drive that stopped answering is a weaker claim of health than one that said OK. An unrecognised verdict sorts as unknown rather than last, so a future verdict string cannot bury itself under the healthy drives.
Both agent sources are shown rather than merged, matching the mapped-drive card: when two sources disagree about one drive, that disagreement is the thing worth looking at.
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