}
	buf.Write(frag)
	return buf.String(), err
}

// WriteTo implements io.WriterTo.
// This may make multiple calls to the [Reader.Read] method of the underlying [Reader].
// If the underlying reader supports the [Reader.WriteTo] method,
// this calls the underlying [Reader.WriteTo] without buffering.
func (b *Reader) WriteTo(w io.Writer) (n int64, err error) {
	b.lastByte = -1
	b.lastRuneSize = -1

	if b.r < b.w {

		dstEntry,
		dstEntry + ".meta",
	}

	// cleanup existing paths first across all drives.
	er.cleanupMultipartPath(ctx, paths...)

	g := errgroup.WithNErrs(len(disks))

	// Rename file on all underlying storage disks.
	for index := range disks {
		g.Go(func() error {
			if disks[index] == nil {
				return errDiskNotFound
			}

	opts.ReplicationRequest = sourceReplReq
	putObjectPart := objectAPI.PutObjectPart

	partInfo, err := putObjectPart(ctx, bucket, object, uploadID, partID, pReader, opts)
	if err != nil {
		// Verify if the underlying error is signature mismatch.
		writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
		return
	}

	etag := partInfo.ETag
	if kind, encrypted := crypto.IsEncrypted(mi.UserDefined); encrypted {

	for index := range disks {
		metadata[index].SetTierFreeVersionID(fvID)
	}

	diskVersions := make([][]byte, len(disks))
	dataDirs := make([]string, len(disks))
	// Rename file on all underlying storage disks.
	for index := range disks {
		g.Go(func() error {
			if disks[index] == nil {
				return errDiskNotFound
			}

			// Pick one FileInfo for a disk at index.
			fi := metadata[index]