diff --git a/exfat/fsck/main.c b/exfat/fsck/main.c
new file mode 100644
index 0000000..c90e3f9
--- /dev/null
+++ b/exfat/fsck/main.c
@@ -0,0 +1,172 @@
+/*
+	main.c (02.09.09)
+	exFAT file system checker.
+
+	Copyright (C) 2011, 2012  Andrew Nayenko
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdio.h>
+#include <string.h>
+#include <exfat.h>
+#include <exfatfs.h>
+#include <inttypes.h>
+
+#define exfat_debug(format, ...)
+
+uint64_t files_count, directories_count;
+
+static int nodeck(struct exfat* ef, struct exfat_node* node)
+{
+	const cluster_t cluster_size = CLUSTER_SIZE(*ef->sb);
+	cluster_t clusters = (node->size + cluster_size - 1) / cluster_size;
+	cluster_t c = node->start_cluster;
+	int rc = 0;
+
+	while (clusters--)
+	{
+		if (CLUSTER_INVALID(c))
+		{
+			char name[EXFAT_NAME_MAX + 1];
+
+			exfat_get_name(node, name, EXFAT_NAME_MAX);
+			exfat_error("file `%s' has invalid cluster 0x%x", name, c);
+			rc = 1;
+			break;
+		}
+		if (BMAP_GET(ef->cmap.chunk, c - EXFAT_FIRST_DATA_CLUSTER) == 0)
+		{
+			char name[EXFAT_NAME_MAX + 1];
+
+			exfat_get_name(node, name, EXFAT_NAME_MAX);
+			exfat_error("cluster 0x%x of file `%s' is not allocated", c, name);
+			rc = 1;
+		}
+		c = exfat_next_cluster(ef, node, c);
+	}
+	return rc;
+}
+
+static void dirck(struct exfat* ef, const char* path)
+{
+	struct exfat_node* parent;
+	struct exfat_node* node;
+	struct exfat_iterator it;
+	int rc;
+	size_t path_length;
+	char* entry_path;
+
+	if (exfat_lookup(ef, &parent, path) != 0)
+		exfat_bug("directory `%s' is not found", path);
+	if (!(parent->flags & EXFAT_ATTRIB_DIR))
+		exfat_bug("`%s' is not a directory (0x%x)", path, parent->flags);
+	if (nodeck(ef, parent) != 0)
+		return;
+
+	path_length = strlen(path);
+	entry_path = malloc(path_length + 1 + EXFAT_NAME_MAX);
+	if (entry_path == NULL)
+	{
+		exfat_error("out of memory");
+		return;
+	}
+	strcpy(entry_path, path);
+	strcat(entry_path, "/");
+
+	rc = exfat_opendir(ef, parent, &it);
+	if (rc != 0)
+	{
+		free(entry_path);
+		exfat_put_node(ef, parent);
+		exfat_error("failed to open directory `%s'", path);
+		return;
+	}
+	while ((node = exfat_readdir(ef, &it)))
+	{
+		exfat_get_name(node, entry_path + path_length + 1, EXFAT_NAME_MAX);
+		exfat_debug("%s: %s, %"PRIu64" bytes, cluster %u", entry_path,
+				IS_CONTIGUOUS(*node) ? "contiguous" : "fragmented",
+				node->size, node->start_cluster);
+		if (node->flags & EXFAT_ATTRIB_DIR)
+		{
+			directories_count++;
+			dirck(ef, entry_path);
+		}
+		else
+		{
+			files_count++;
+			nodeck(ef, node);
+		}
+		exfat_put_node(ef, node);
+	}
+	exfat_closedir(ef, &it);
+	exfat_put_node(ef, parent);
+	free(entry_path);
+}
+
+static void fsck(struct exfat* ef)
+{
+	exfat_print_info(ef->sb, exfat_count_free_clusters(ef));
+	dirck(ef, "");
+}
+
+static void usage(const char* prog)
+{
+	fprintf(stderr, "Usage: %s [-v] <device>\n", prog);
+	exit(1);
+}
+
+int main(int argc, char* argv[])
+{
+	char** pp;
+	const char* spec = NULL;
+	struct exfat ef;
+
+	printf("exfatfsck %u.%u.%u\n",
+			EXFAT_VERSION_MAJOR, EXFAT_VERSION_MINOR, EXFAT_VERSION_PATCH);
+
+	for (pp = argv + 1; *pp; pp++)
+	{
+		if (strcmp(*pp, "-v") == 0)
+		{
+			puts("Copyright (C) 2011, 2012  Andrew Nayenko");
+			return 0;
+		}
+		else if (spec == NULL)
+			spec = *pp;
+		else
+			usage(argv[0]);
+	}
+	if (spec == NULL)
+		usage(argv[0]);
+
+	if (exfat_mount(&ef, spec, "ro") != 0)
+		return 1;
+
+	printf("Checking file system on %s.\n", spec);
+	fsck(&ef);
+	exfat_unmount(&ef);
+	printf("Totally %"PRIu64" directories and %"PRIu64" files.\n",
+			directories_count, files_count);
+
+	fputs("File system checking finished. ", stdout);
+	if (exfat_errors != 0)
+	{
+		printf("ERRORS FOUND: %d.\n", exfat_errors);
+		return 1;
+	}
+	puts("No errors found.");
+	return 0;
+}