diff --git a/build/params.go b/build/params.go
index 0901bebc7..21c102e9f 100644
--- a/build/params.go
+++ b/build/params.go
@@ -5,6 +5,6 @@ package build
 const UnixfsChunkSize uint64 = 1 << 20
 const UnixfsLinksPerLevel = 1024
 
-const SectorSize = 1024
+const SectorSize = 16 << 20
 
 // TODO: Move other important consts here
diff --git a/node/impl/storminer.go b/node/impl/storminer.go
index 11bfe39f2..41371fa66 100644
--- a/node/impl/storminer.go
+++ b/node/impl/storminer.go
@@ -31,7 +31,7 @@ func (sm *StorageMinerAPI) ActorAddresses(context.Context) ([]address.Address, e
 }
 
 func (sm *StorageMinerAPI) StoreGarbageData(ctx context.Context) (uint64, error) {
-	size := uint64(build.SectorSize - 8) // this is the most data we can fit in a sector. TODO: check if correct
+	size := sectorbuilder.UserBytesForSectorSize(build.SectorSize)
 
 	name := fmt.Sprintf("fake-file-%d", rand.Intn(100000000))
 	sectorId, err := sm.Sectors.AddPiece(name, size, io.LimitReader(rand.New(rand.NewSource(42)), 1016))
diff --git a/storage/sectorblocks/blocks.go b/storage/sectorblocks/blocks.go
index 76b0fe045..cebb8132c 100644
--- a/storage/sectorblocks/blocks.go
+++ b/storage/sectorblocks/blocks.go
@@ -7,6 +7,7 @@ import (
 	"github.com/filecoin-project/go-lotus/node/modules/dtypes"
 	"github.com/ipfs/go-datastore/namespace"
 	"github.com/ipfs/go-datastore/query"
+	blockstore "github.com/ipfs/go-ipfs-blockstore"
 	ipld "github.com/ipfs/go-ipld-format"
 	"sync"
 
@@ -26,10 +27,13 @@ const (
 )
 
 var dsPrefix = datastore.NewKey("/sealedblocks")
+var imBlocksPrefix = datastore.NewKey("/intermediate")
 
 type SectorBlocks struct {
 	*sector.Store
 
+	intermediate blockstore.Blockstore // holds intermediate nodes TODO: consider combining with the staging blockstore
+
 	unsealed *unsealedBlocks
 	keys     datastore.Batching
 	keyLk    sync.Mutex
@@ -38,11 +42,15 @@ type SectorBlocks struct {
 func NewSectorBlocks(sectst *sector.Store, ds dtypes.MetadataDS, sb *sectorbuilder.SectorBuilder) *SectorBlocks {
 	sbc := &SectorBlocks{
 		Store: sectst,
-		keys:  namespace.Wrap(ds, dsPrefix),
+
+		intermediate: blockstore.NewBlockstore(namespace.Wrap(ds, imBlocksPrefix)),
+
+		keys: namespace.Wrap(ds, dsPrefix),
 	}
 
 	unsealed := &unsealedBlocks{ // TODO: untangle this
-		sb:        sb,
+		sb: sb,
+
 		unsealed:  map[string][]byte{},
 		unsealing: map[string]chan struct{}{},
 	}
@@ -60,8 +68,9 @@ type UnixfsReader interface {
 }
 
 type refStorer struct {
-	blockReader UnixfsReader
-	writeRef    func(cid cid.Cid, offset uint64, size uint32) error
+	blockReader  UnixfsReader
+	writeRef     func(cid cid.Cid, offset uint64, size uint32) error
+	intermediate blockstore.Blockstore
 
 	pieceRef  string
 	remaining []byte
@@ -119,7 +128,12 @@ func (r *refStorer) Read(p []byte) (n int, err error) {
 		}
 
 		if len(data) == 0 {
-			panic("Handle intermediate nodes") // TODO: !
+			// TODO: batch
+			// TODO: GC
+			if err := r.intermediate.Put(nd); err != nil {
+				return 0, err
+			}
+			continue
 		}
 
 		if err := r.writeRef(nd.Cid(), offset, uint32(len(data))); err != nil {
@@ -141,7 +155,12 @@ func (st *SectorBlocks) AddUnixfsPiece(ref cid.Cid, r UnixfsReader, keepAtLeast
 		return 0, err
 	}
 
-	refst := &refStorer{blockReader: r, pieceRef: string(SerializationUnixfs0) + ref.String(), writeRef: st.writeRef}
+	refst := &refStorer{
+		blockReader:  r,
+		pieceRef:     string(SerializationUnixfs0) + ref.String(),
+		writeRef:     st.writeRef,
+		intermediate: st.intermediate,
+	}
 
 	return st.Store.AddPiece(refst.pieceRef, uint64(size), refst)
 }
@@ -196,7 +215,7 @@ func (st *SectorBlocks) Has(k cid.Cid) (bool, error) {
 
 func (st *SectorBlocks) SealedBlockstore(approveUnseal func() error) *SectorBlockStore {
 	return &SectorBlockStore{
-		//local:         nil, // TODO: Pass staging
+		intermediate:  st.intermediate,
 		sectorBlocks:  st,
 		approveUnseal: approveUnseal,
 	}
diff --git a/storage/sectorblocks/blockstore.go b/storage/sectorblocks/blockstore.go
index 2087b9b6d..e28e750d0 100644
--- a/storage/sectorblocks/blockstore.go
+++ b/storage/sectorblocks/blockstore.go
@@ -8,7 +8,7 @@ import (
 )
 
 type SectorBlockStore struct {
-	// local        blockstore.Blockstore // staging before GC // TODO: Pass staging
+	intermediate blockstore.Blockstore
 	sectorBlocks *SectorBlocks
 
 	approveUnseal func() error
@@ -38,25 +38,25 @@ func (s *SectorBlockStore) HashOnRead(enabled bool) {
 }
 
 func (s *SectorBlockStore) Has(c cid.Cid) (bool, error) {
-	/*has, err := s.local.Has(c) // TODO: Pass staging
+	has, err := s.intermediate.Has(c)
 	if err != nil {
 		return false, err
 	}
 	if has {
 		return true, nil
-	}*/
+	}
 
 	return s.sectorBlocks.Has(c)
 }
 
 func (s *SectorBlockStore) Get(c cid.Cid) (blocks.Block, error) {
-	/*val, err := s.local.Get(c) // TODO: Pass staging
+	val, err := s.intermediate.Get(c)
 	if err == nil {
 		return val, nil
 	}
 	if err != blockstore.ErrNotFound {
 		return nil, err
-	}*/
+	}
 
 	refs, err := s.sectorBlocks.GetRefs(c)
 	if err != nil {