}
			writers := make([]io.Writer, len(disks))
			for i, disk := range disks {
				if disk == nil {
					continue
				}
				writers[i] = newBitrotWriter(disk, "", "testbucket", "object2", erasure.ShardFileSize(int64(len(data[test.offset:]))), test.algorithm, erasure.ShardSize())
			}
			for j := range disks[:test.offDisks] {
				switch w := writers[j].(type) {
				case *wholeBitrotWriter: