diff --git a/cmd/boostd/recover.go b/cmd/boostd/recover.go
index 04b155827..3c108f7a0 100644
--- a/cmd/boostd/recover.go
+++ b/cmd/boostd/recover.go
@@ -19,6 +19,7 @@ import (
 	"github.com/filecoin-project/boost/piecedirectory"
 	bdclient "github.com/filecoin-project/boostd-data/client"
 	"github.com/filecoin-project/boostd-data/model"
+	"github.com/filecoin-project/dagstore/mount"
 	"github.com/filecoin-project/go-address"
 	"github.com/filecoin-project/go-commp-utils/writer"
 	"github.com/filecoin-project/go-jsonrpc"
@@ -33,7 +34,6 @@ import (
 	"github.com/google/uuid"
 	"github.com/ipfs/go-cid"
 	"github.com/ipfs/go-cidutil/cidenc"
-	carv2 "github.com/ipld/go-car/v2"
 	"github.com/mitchellh/go-homedir"
 	"github.com/multiformats/go-multibase"
 	"github.com/urfave/cli/v2"
@@ -461,7 +461,7 @@ func (dr *DisasterRecovery) CompleteSector(s abi.SectorNumber) error {
 }
 
 // safeUnsealSector tries to return a reader to an unsealed sector or times out
-func safeUnsealSector(ctx context.Context, sectorid abi.SectorNumber, offset abi.UnpaddedPieceSize, piecesize abi.PaddedPieceSize) (io.ReadCloser, bool, error) {
+func safeUnsealSector(ctx context.Context, sectorid abi.SectorNumber, offset abi.UnpaddedPieceSize, piecesize abi.PaddedPieceSize) (mount.Reader, bool, error) {
 	mid, _ := address.IDFromAddress(maddr)
 
 	sid := abi.SectorID{
@@ -474,7 +474,7 @@ func safeUnsealSector(ctx context.Context, sectorid abi.SectorNumber, offset abi
 		logger.Errorw("storage find sector", "err", err)
 	}
 
-	var reader io.ReadCloser
+	var reader mount.Reader
 	var isUnsealed bool
 
 	done := make(chan struct{})
@@ -507,7 +507,7 @@ func safeUnsealSector(ctx context.Context, sectorid abi.SectorNumber, offset abi
 	logger.Debugw("sa.IsUnsealed return true", "sector", sectorid)
 
 	go func() {
-		reader, err = sa.UnsealSector(ctx, sectorid, offset, piecesize.Unpadded())
+		reader, err = sa.UnsealSectorAt(ctx, sectorid, offset, piecesize.Unpadded())
 		if err != nil {
 			logger.Errorw("sa.UnsealSector return error", "sector", sectorid, "err", err)
 			return
@@ -574,25 +574,12 @@ func processPiece(ctx context.Context, sectorid abi.SectorNumber, chainDealID ab
 	if err != nil {
 		return err
 	}
+	defer reader.Close()
 	if !isUnsealed {
 		return fmt.Errorf("sector %d is not unsealed", sid)
 	}
 
 	dr.Sectors[sid].Deals[cdi].IsUnsealed = true
-
-	readerAt := reader.(Reader)
-
-	opts := []carv2.Option{carv2.ZeroLengthSectionAsEOF(true)}
-	rr, err := carv2.NewReader(readerAt, opts...)
-	if err != nil {
-		return err
-	}
-
-	drr, err := rr.DataReader()
-	if err != nil {
-		return err
-	}
-
 	dr.Sectors[sid].Deals[cdi].GotDataReader = true
 
 	if !ignoreLID { // populate LID
@@ -657,7 +644,7 @@ func processPiece(ctx context.Context, sectorid abi.SectorNumber, chainDealID ab
 
 	if !ignoreCommp { // commp over data reader
 		w := &writer.Writer{}
-		_, err = io.CopyBuffer(w, drr, make([]byte, writer.CommPBuf))
+		_, err = io.CopyBuffer(w, reader, make([]byte, writer.CommPBuf))
 		if err != nil {
 			return fmt.Errorf("copy into commp writer: %w", err)
 		}
@@ -670,9 +657,6 @@ func processPiece(ctx context.Context, sectorid abi.SectorNumber, chainDealID ab
 		encoder := cidenc.Encoder{Base: multibase.MustNewEncoder(multibase.Base32)}
 		_ = encoder
 
-		//fmt.Println("CommP CID: ", encoder.Encode(commp.PieceCID))
-		//fmt.Println("Piece size: ", types.NewInt(uint64(commp.PieceSize.Unpadded().Padded())))
-
 		if !commp.PieceCID.Equals(piececid) {
 			return fmt.Errorf("calculated commp doesnt match on-chain data, expected %s, got %s", piececid, commp.PieceCID)
 		}
@@ -776,13 +760,6 @@ func getActorAddress(ctx context.Context, cctx *cli.Context) (maddr address.Addr
 	return maddr, nil
 }
 
-type Reader interface {
-	io.Closer
-	io.Reader
-	io.ReaderAt
-	io.Seeker
-}
-
 func createLogger(logPath string) (*zap.SugaredLogger, error) {
 	logCfg := zap.NewDevelopmentConfig()
 	logCfg.OutputPaths = []string{"stdout", logPath}