if err != nil {
		return setRestoreHeaderFn(oi, err)
	}
	defer gr.Close()

	// rehydrate the parts back on disk as per the original xl.meta prior to transition
	for _, partInfo := range oi.Parts {
		hr, err := hash.NewReader(ctx, io.LimitReader(gr, partInfo.Size), partInfo.Size, "", "", partInfo.Size)
		if err != nil {
			return setRestoreHeaderFn(oi, err)
		}