Full explanation from the Backblaze folks [1].<p>[1] <a href="https:&#x2F;&#x2F;backblaze.zendesk.com&#x2F;entries&#x2F;98786348--bzvol-is-missing" rel="nofollow">https:&#x2F;&#x2F;backblaze.zendesk.com&#x2F;entries&#x2F;98786348--bzvol-is-mis...</a>