diff --git a/headers/private/storage/DiskSystem.h b/headers/private/storage/DiskSystem.h
index 1c50363da2..605dba3847 100644
--- a/headers/private/storage/DiskSystem.h
+++ b/headers/private/storage/DiskSystem.h
@@ -40,14 +40,6 @@ public:
 	bool SupportsInitializingChild(BPartition *child,
 								   const char *diskSystem) const;
 
-	bool SupportsParentSystem(BPartition *child) const;
-	bool SupportsParentSystem(const char *system) const;
-		// True in most cases. NULL == raw device.
-	bool SupportsChildSystem(BPartition *child, const char *system) const;
-	bool SupportsChildSystem(const char *system) const;
-		// False for most file systems, true for most partitioning
-		// systems.
-
 	status_t ValidateResize(BPartition *partition, off_t *size) const;
 	status_t ValidateResizeChild(BPartition *child, off_t *size) const;
 	status_t ValidateMove(BPartition *partition, off_t *start) const;
@@ -58,6 +50,8 @@ public:
 	status_t ValidateCreateChild(BPartition *partition, off_t *start,
 								 off_t *size, const char *type,
 								 const char *parameters) const;
+	status_t ValidateInitialize(BPartition *partition, char *name,
+								const char *parameters) const;
 
 	status_t GetNextSupportedType(BPartition *partition, int32 *cookie,
 								  char *type) const;
@@ -70,10 +64,12 @@ public:
 	bool IsSubSystemFor(BPartition *parent) const;
 
 private:
+	status_t _SetTo(disk_system_id id);
 	status_t _SetTo(user_disk_system_info *info);
 	void _Unset();
 
 	friend class BDiskDeviceRoster;
+	friend class BPartition;
 
 	disk_system_id	fID;
 	BString			fName;
diff --git a/src/kits/storage/DiskSystem.cpp b/src/kits/storage/DiskSystem.cpp
index bdb5bd390b..3824362775 100644
--- a/src/kits/storage/DiskSystem.cpp
+++ b/src/kits/storage/DiskSystem.cpp
@@ -301,6 +301,20 @@ BDiskSystem::ValidateCreateChild(BPartition *partition, off_t *start,
 				start, size, type, parameters);
 }
 
+// ValidateInitialize
+status_t
+BDiskSystem::ValidateInitialize(BPartition *partition, char *name,
+								const char *parameters) const
+{
+	if (InitCheck() != B_OK)
+		return InitCheck();
+// parameters may be NULL
+	if (!name || !partition || !partition->_IsShadow())
+		return B_BAD_VALUE;
+	return _kern_validate_initialize_partition(fID, partition->_ShadowID(),
+											   name, parameters);
+}
+
 // GetNextSupportedType
 status_t
 BDiskSystem::GetNextSupportedType(BPartition *partition, int32 *cookie,
@@ -351,6 +365,20 @@ BDiskSystem::IsSubSystemFor(BPartition *parent) const
 			&& _kern_is_sub_disk_system_for(fID, parent->_ShadowID()));
 }
 
+// _SetTo
+status_t
+BDiskSystem::_SetTo(disk_system_id id)
+{
+	_Unset();
+	if (id < 0)
+		return fID;
+	user_disk_system_info info;
+	status_t error = _kern_get_disk_system_info(id, &info);
+	if (error != B_OK)
+		return (fID = error);
+	return _SetTo(&info);
+}
+
 // _SetTo
 status_t
 BDiskSystem::_SetTo(user_disk_system_info *info)