askDisks = getListQuorum("strict", set.setDriveCount)
					}
				}

				// Special case: ask all disks if the drive count is 4
				if set.setDriveCount == 4 || askDisks > len(disks) {
					askDisks = len(disks) // use all available drives
				}

				var fallbackDisks []StorageAPI
				if askDisks > 0 && len(disks) > askDisks {
					rand.Shuffle(len(disks), func(i, j int) {

				prefixWalkCh := make(chan itemOrErr[ObjectInfo], 100)
				if err := api.Walk(ctx, r.Source.Bucket, prefix, prefixWalkCh, WalkOptions{
					Marker:   lastObject,
					Filter:   selectObj,
					AskDisks: walkQuorum,
				}); err != nil {
					cancelCause(err)
					xioutil.SafeClose(walkCh)
					return
				}
				for obj := range prefixWalkCh {
					walkCh <- obj
				}
			}