diff --git a/src/blobstore/implementations/onblocks/BlobStoreOnBlocks.cpp b/src/blobstore/implementations/onblocks/BlobStoreOnBlocks.cpp
index ea054728..31647c60 100644
--- a/src/blobstore/implementations/onblocks/BlobStoreOnBlocks.cpp
+++ b/src/blobstore/implementations/onblocks/BlobStoreOnBlocks.cpp
@@ -27,8 +27,8 @@ using datanodestore::DataNodeStore;
 using datatreestore::DataTreeStore;
 using parallelaccessdatatreestore::ParallelAccessDataTreeStore;
 
-BlobStoreOnBlocks::BlobStoreOnBlocks(unique_ref<BlockStore> blockStore, uint64_t blocksizeBytes)
-        : _dataTreeStore(make_unique_ref<ParallelAccessDataTreeStore>(make_unique_ref<DataTreeStore>(make_unique_ref<DataNodeStore>(make_unique_ref<ParallelAccessBlockStore>(std::move(blockStore)), blocksizeBytes)))) {
+BlobStoreOnBlocks::BlobStoreOnBlocks(unique_ref<BlockStore> blockStore, uint64_t physicalBlocksizeBytes)
+        : _dataTreeStore(make_unique_ref<ParallelAccessDataTreeStore>(make_unique_ref<DataTreeStore>(make_unique_ref<DataNodeStore>(make_unique_ref<ParallelAccessBlockStore>(std::move(blockStore)), physicalBlocksizeBytes)))) {
 }
 
 BlobStoreOnBlocks::~BlobStoreOnBlocks() {
@@ -52,8 +52,8 @@ void BlobStoreOnBlocks::remove(unique_ref<Blob> blob) {
     _dataTreeStore->remove((*_blob)->releaseTree());
 }
 
-uint64_t BlobStoreOnBlocks::blocksizeBytes() const {
-    return _dataTreeStore->blocksizeBytes();
+uint64_t BlobStoreOnBlocks::virtualBlocksizeBytes() const {
+    return _dataTreeStore->virtualBlocksizeBytes();
 }
 
 uint64_t BlobStoreOnBlocks::numBlocks() const {
diff --git a/src/blobstore/implementations/onblocks/BlobStoreOnBlocks.h b/src/blobstore/implementations/onblocks/BlobStoreOnBlocks.h
index b915c95b..92234543 100644
--- a/src/blobstore/implementations/onblocks/BlobStoreOnBlocks.h
+++ b/src/blobstore/implementations/onblocks/BlobStoreOnBlocks.h
@@ -16,7 +16,7 @@ class ParallelAccessDataTreeStore;
 
 class BlobStoreOnBlocks final: public BlobStore {
 public:
-  BlobStoreOnBlocks(cpputils::unique_ref<blockstore::BlockStore> blockStore, uint64_t blocksizeBytes);
+  BlobStoreOnBlocks(cpputils::unique_ref<blockstore::BlockStore> blockStore, uint64_t physicalBlocksizeBytes);
   ~BlobStoreOnBlocks();
 
   cpputils::unique_ref<Blob> create() override;
@@ -25,7 +25,8 @@ public:
   void remove(cpputils::unique_ref<Blob> blob) override;
 
   //TODO Test blocksizeBytes/numBlocks/estimateSpaceForNumBlocksLeft
-  uint64_t blocksizeBytes() const override;
+  //virtual means "space we can use" as opposed to "space it takes on the disk" (i.e. virtual is without headers, checksums, ...)
+  uint64_t virtualBlocksizeBytes() const override;
   uint64_t numBlocks() const override;
   uint64_t estimateSpaceForNumBlocksLeft() const override;
 
diff --git a/src/blobstore/implementations/onblocks/datanodestore/DataNodeStore.cpp b/src/blobstore/implementations/onblocks/datanodestore/DataNodeStore.cpp
index c61a8be1..9e0eaad5 100644
--- a/src/blobstore/implementations/onblocks/datanodestore/DataNodeStore.cpp
+++ b/src/blobstore/implementations/onblocks/datanodestore/DataNodeStore.cpp
@@ -20,8 +20,8 @@ namespace blobstore {
 namespace onblocks {
 namespace datanodestore {
 
-DataNodeStore::DataNodeStore(unique_ref<BlockStore> blockstore, uint64_t blocksizeBytes)
-: _blockstore(std::move(blockstore)), _layout(blocksizeBytes) {
+DataNodeStore::DataNodeStore(unique_ref<BlockStore> blockstore, uint64_t physicalBlocksizeBytes)
+: _blockstore(std::move(blockstore)), _layout(_blockstore->blockSizeFromPhysicalBlockSize(physicalBlocksizeBytes)) {
 }
 
 DataNodeStore::~DataNodeStore() {
@@ -96,7 +96,7 @@ uint64_t DataNodeStore::estimateSpaceForNumNodesLeft() const {
   return _blockstore->estimateNumFreeBytes() / _layout.blocksizeBytes();
 }
 
-uint64_t DataNodeStore::blocksizeBytes() const {
+uint64_t DataNodeStore::virtualBlocksizeBytes() const {
   return _layout.blocksizeBytes();
 }
 
diff --git a/src/blobstore/implementations/onblocks/datanodestore/DataNodeStore.h b/src/blobstore/implementations/onblocks/datanodestore/DataNodeStore.h
index 4cbe2339..01939d30 100644
--- a/src/blobstore/implementations/onblocks/datanodestore/DataNodeStore.h
+++ b/src/blobstore/implementations/onblocks/datanodestore/DataNodeStore.h
@@ -21,7 +21,7 @@ class DataInnerNode;
 
 class DataNodeStore final {
 public:
-  DataNodeStore(cpputils::unique_ref<blockstore::BlockStore> blockstore, uint64_t blocksizeBytes);
+  DataNodeStore(cpputils::unique_ref<blockstore::BlockStore> blockstore, uint64_t physicalBlocksizeBytes);
   ~DataNodeStore();
 
   static constexpr uint8_t MAX_DEPTH = 10;
@@ -42,7 +42,7 @@ public:
   void removeSubtree(cpputils::unique_ref<DataNode> node);
 
   //TODO Test blocksizeBytes/numBlocks/estimateSpaceForNumBlocksLeft
-  uint64_t blocksizeBytes() const;
+  uint64_t virtualBlocksizeBytes() const;
   uint64_t numNodes() const;
   uint64_t estimateSpaceForNumNodesLeft() const;
   //TODO Test overwriteNodeWith(), createNodeAsCopyFrom(), removeSubtree()
diff --git a/src/blobstore/implementations/onblocks/datatreestore/DataTreeStore.h b/src/blobstore/implementations/onblocks/datatreestore/DataTreeStore.h
index 4e253728..78d0455d 100644
--- a/src/blobstore/implementations/onblocks/datatreestore/DataTreeStore.h
+++ b/src/blobstore/implementations/onblocks/datatreestore/DataTreeStore.h
@@ -26,7 +26,7 @@ public:
   void remove(cpputils::unique_ref<DataTree> tree);
 
   //TODO Test blocksizeBytes/numBlocks/estimateSpaceForNumBlocksLeft
-  uint64_t blocksizeBytes() const;
+  uint64_t virtualBlocksizeBytes() const;
   uint64_t numNodes() const;
   uint64_t estimateSpaceForNumNodesLeft() const;
 
@@ -44,8 +44,8 @@ inline uint64_t DataTreeStore::estimateSpaceForNumNodesLeft() const {
     return _nodeStore->estimateSpaceForNumNodesLeft();
 }
 
-inline uint64_t DataTreeStore::blocksizeBytes() const {
-    return _nodeStore->blocksizeBytes();
+inline uint64_t DataTreeStore::virtualBlocksizeBytes() const {
+    return _nodeStore->virtualBlocksizeBytes();
 }
 
 }
diff --git a/src/blobstore/implementations/onblocks/parallelaccessdatatreestore/ParallelAccessDataTreeStore.h b/src/blobstore/implementations/onblocks/parallelaccessdatatreestore/ParallelAccessDataTreeStore.h
index 533a5146..beea020e 100644
--- a/src/blobstore/implementations/onblocks/parallelaccessdatatreestore/ParallelAccessDataTreeStore.h
+++ b/src/blobstore/implementations/onblocks/parallelaccessdatatreestore/ParallelAccessDataTreeStore.h
@@ -27,7 +27,7 @@ public:
   void remove(cpputils::unique_ref<DataTreeRef> tree);
 
   //TODO Test blocksizeBytes/numBlocks/estimateSpaceForNumBlocksLeft
-  uint64_t blocksizeBytes() const;
+  uint64_t virtualBlocksizeBytes() const;
   uint64_t numNodes() const;
   uint64_t estimateSpaceForNumNodesLeft() const;
 
@@ -38,8 +38,8 @@ private:
   DISALLOW_COPY_AND_ASSIGN(ParallelAccessDataTreeStore);
 };
 
-inline uint64_t ParallelAccessDataTreeStore::blocksizeBytes() const {
-    return _dataTreeStore->blocksizeBytes();
+inline uint64_t ParallelAccessDataTreeStore::virtualBlocksizeBytes() const {
+    return _dataTreeStore->virtualBlocksizeBytes();
 }
 
 inline uint64_t ParallelAccessDataTreeStore::numNodes() const {
diff --git a/src/blobstore/interface/BlobStore.h b/src/blobstore/interface/BlobStore.h
index bf7c0653..9110f9dd 100644
--- a/src/blobstore/interface/BlobStore.h
+++ b/src/blobstore/interface/BlobStore.h
@@ -22,7 +22,8 @@ public:
 
   virtual uint64_t numBlocks() const = 0;
   virtual uint64_t estimateSpaceForNumBlocksLeft() const = 0;
-  virtual uint64_t blocksizeBytes() const = 0;
+  //virtual means "space we can use" as opposed to "space it takes on the disk" (i.e. virtual is without headers, checksums, ...)
+  virtual uint64_t virtualBlocksizeBytes() const = 0;
 };
 
 }
diff --git a/src/cryfs/config/CryConfig.cpp b/src/cryfs/config/CryConfig.cpp
index 46338c00..7e07bb10 100644
--- a/src/cryfs/config/CryConfig.cpp
+++ b/src/cryfs/config/CryConfig.cpp
@@ -33,7 +33,7 @@ CryConfig CryConfig::load(const Data &data) {
   cfg._encKey = pt.get("cryfs.key", "");
   cfg._cipher = pt.get("cryfs.cipher", "");
   cfg._version = pt.get("cryfs.version", "0.8"); // CryFS 0.8 didn't specify this field, so if the field doesn't exist, it's 0.8.
-  cfg._blocksizeBytes = pt.get<uint64_t>("cryfs.blocksizeBytes", 32 * 1024); // CryFS <= 0.9.2 used a 32KB block size.
+  cfg._blocksizeBytes = pt.get<uint64_t>("cryfs.blocksizeBytes", 32832); // CryFS <= 0.9.2 used a 32KB block size which was this physical block size.
   return cfg;
 }
 
diff --git a/src/cryfs/filesystem/CryDevice.cpp b/src/cryfs/filesystem/CryDevice.cpp
index 1d010b08..e24aabea 100644
--- a/src/cryfs/filesystem/CryDevice.cpp
+++ b/src/cryfs/filesystem/CryDevice.cpp
@@ -138,7 +138,7 @@ void CryDevice::statfs(const bf::path &path, struct statvfs *fsstat) {
   callFsActionCallbacks();
   uint64_t numUsedBlocks = _fsBlobStore->numBlocks();
   uint64_t numFreeBlocks = _fsBlobStore->estimateSpaceForNumBlocksLeft();
-  fsstat->f_bsize = _fsBlobStore->blocksizeBytes();
+  fsstat->f_bsize = _fsBlobStore->virtualBlocksizeBytes();
   fsstat->f_blocks = numUsedBlocks + numFreeBlocks;
   fsstat->f_bfree = numFreeBlocks;
   fsstat->f_bavail = numFreeBlocks;
diff --git a/src/cryfs/filesystem/cachingfsblobstore/CachingFsBlobStore.h b/src/cryfs/filesystem/cachingfsblobstore/CachingFsBlobStore.h
index 6915b03f..47e19cb7 100644
--- a/src/cryfs/filesystem/cachingfsblobstore/CachingFsBlobStore.h
+++ b/src/cryfs/filesystem/cachingfsblobstore/CachingFsBlobStore.h
@@ -24,7 +24,7 @@ namespace cryfs {
             cpputils::unique_ref<SymlinkBlobRef> createSymlinkBlob(const boost::filesystem::path &target);
             boost::optional<cpputils::unique_ref<FsBlobRef>> load(const blockstore::Key &key);
             void remove(cpputils::unique_ref<FsBlobRef> blob);
-            uint64_t blocksizeBytes() const;
+            uint64_t virtualBlocksizeBytes() const;
             uint64_t numBlocks() const;
             uint64_t estimateSpaceForNumBlocksLeft() const;
 
@@ -81,8 +81,8 @@ namespace cryfs {
             _cache.push(key, std::move(baseBlob));
         }
 
-        inline uint64_t CachingFsBlobStore::blocksizeBytes() const {
-            return _baseBlobStore->blocksizeBytes();
+        inline uint64_t CachingFsBlobStore::virtualBlocksizeBytes() const {
+            return _baseBlobStore->virtualBlocksizeBytes();
         }
 
         inline uint64_t CachingFsBlobStore::numBlocks() const {
diff --git a/src/cryfs/filesystem/fsblobstore/DirBlob.cpp b/src/cryfs/filesystem/fsblobstore/DirBlob.cpp
index 9b4d188c..849b3243 100644
--- a/src/cryfs/filesystem/fsblobstore/DirBlob.cpp
+++ b/src/cryfs/filesystem/fsblobstore/DirBlob.cpp
@@ -138,7 +138,7 @@ void DirBlob::statChildExceptSize(const Key &key, struct ::stat *result) const {
 #endif
   //TODO Move ceilDivision to general utils which can be used by cryfs as well
   result->st_blocks = blobstore::onblocks::utils::ceilDivision(result->st_size, (off_t)512);
-  result->st_blksize = _fsBlobStore->blocksizeBytes();
+  result->st_blksize = _fsBlobStore->virtualBlocksizeBytes();
 }
 
 void DirBlob::chmodChild(const Key &key, mode_t mode) {
diff --git a/src/cryfs/filesystem/fsblobstore/FsBlobStore.h b/src/cryfs/filesystem/fsblobstore/FsBlobStore.h
index 583f56b0..3d2ac248 100644
--- a/src/cryfs/filesystem/fsblobstore/FsBlobStore.h
+++ b/src/cryfs/filesystem/fsblobstore/FsBlobStore.h
@@ -25,7 +25,7 @@ namespace cryfs {
             uint64_t numBlocks() const;
             uint64_t estimateSpaceForNumBlocksLeft() const;
 
-            uint64_t blocksizeBytes() const;
+            uint64_t virtualBlocksizeBytes() const;
 
         private:
 
@@ -75,8 +75,8 @@ namespace cryfs {
             };
         }
 
-        inline uint64_t FsBlobStore::blocksizeBytes() const {
-            return _baseBlobStore->blocksizeBytes();
+        inline uint64_t FsBlobStore::virtualBlocksizeBytes() const {
+            return _baseBlobStore->virtualBlocksizeBytes();
         }
     }
 }
diff --git a/src/cryfs/filesystem/parallelaccessfsblobstore/ParallelAccessFsBlobStore.h b/src/cryfs/filesystem/parallelaccessfsblobstore/ParallelAccessFsBlobStore.h
index cca1b3e4..36beac14 100644
--- a/src/cryfs/filesystem/parallelaccessfsblobstore/ParallelAccessFsBlobStore.h
+++ b/src/cryfs/filesystem/parallelaccessfsblobstore/ParallelAccessFsBlobStore.h
@@ -26,7 +26,7 @@ namespace cryfs {
             cpputils::unique_ref<SymlinkBlobRef> createSymlinkBlob(const boost::filesystem::path &target);
             boost::optional<cpputils::unique_ref<FsBlobRef>> load(const blockstore::Key &key);
             void remove(cpputils::unique_ref<FsBlobRef> blob);
-            uint64_t blocksizeBytes() const;
+            uint64_t virtualBlocksizeBytes() const;
             uint64_t numBlocks() const;
             uint64_t estimateSpaceForNumBlocksLeft() const;
 
@@ -58,8 +58,8 @@ namespace cryfs {
             };
         }
 
-        inline uint64_t ParallelAccessFsBlobStore::blocksizeBytes() const {
-            return _baseBlobStore->blocksizeBytes();
+        inline uint64_t ParallelAccessFsBlobStore::virtualBlocksizeBytes() const {
+            return _baseBlobStore->virtualBlocksizeBytes();
         }
 
         inline uint64_t ParallelAccessFsBlobStore::numBlocks() const {
diff --git a/test/blobstore/implementations/onblocks/datanodestore/DataNodeStoreTest.cpp b/test/blobstore/implementations/onblocks/datanodestore/DataNodeStoreTest.cpp
index 05ee7f59..243d08c0 100644
--- a/test/blobstore/implementations/onblocks/datanodestore/DataNodeStoreTest.cpp
+++ b/test/blobstore/implementations/onblocks/datanodestore/DataNodeStoreTest.cpp
@@ -135,3 +135,16 @@ TEST_F(DataNodeStoreTest, NumNodesIsCorrectAfterRemovingANode) {
   nodeStore->remove(std::move(node));
   EXPECT_EQ(1u, nodeStore->numNodes());
 }
+
+TEST_F(DataNodeStoreTest, PhysicalBlockSize_Leaf) {
+  auto leaf = nodeStore->createNewLeafNode();
+  auto block = blockStore->load(leaf->key()).value();
+  EXPECT_EQ(BLOCKSIZE_BYTES, block->size());
+}
+
+TEST_F(DataNodeStoreTest, PhysicalBlockSize_Inner) {
+  auto leaf = nodeStore->createNewLeafNode();
+  auto node = nodeStore->createNewInnerNode(*leaf);
+  auto block = blockStore->load(node->key()).value();
+  EXPECT_EQ(BLOCKSIZE_BYTES, block->size());
+}
\ No newline at end of file