diff --git a/include/spdk/dif.h b/include/spdk/dif.h
index 684afad4c..440809e19 100644
--- a/include/spdk/dif.h
+++ b/include/spdk/dif.h
@@ -110,8 +110,8 @@ struct spdk_dif_error {
  * \param md_size Metadata size in a block.
  * \param md_interleave If true, metadata is interleaved with block data.
  * If false, metadata is separated with block data.
- * \param dif_loc DIF location. If true, DIF is set in the last 8 bytes of metadata.
- * If false, DIF is in the first 8 bytes of metadata.
+ * \param dif_loc DIF location. If true, DIF is set in the first 8 bytes of metadata.
+ * If false, DIF is in the last 8 bytes of metadata.
  * \param dif_type Type of DIF.
  * \param dif_flags Flag to specify the DIF action.
  * \param init_ref_tag Initial reference tag. For type 1, this is the
diff --git a/lib/util/dif.c b/lib/util/dif.c
index 04d61e66e..b39b71658 100644
--- a/lib/util/dif.c
+++ b/lib/util/dif.c
@@ -158,7 +158,7 @@ _dif_is_disabled(enum spdk_dif_type dif_type)
 static uint32_t
 _get_guard_interval(uint32_t block_size, uint32_t md_size, bool dif_loc, bool md_interleave)
 {
-	if (dif_loc) {
+	if (!dif_loc) {
 		/* For metadata formats with more than 8 bytes, if the DIF is
 		 * contained in the last 8 bytes of metadata, then the CRC
 		 * covers all metadata up to but excluding these last 8 bytes.
diff --git a/test/unit/lib/util/dif.c/dif_ut.c b/test/unit/lib/util/dif.c/dif_ut.c
index 6859e64d1..99be968a8 100644
--- a/test/unit/lib/util/dif.c/dif_ut.c
+++ b/test/unit/lib/util/dif.c/dif_ut.c
@@ -183,7 +183,7 @@ dif_generate_and_verify_test(void)
 
 	/* The case that DIF is contained in the first 8 bytes of metadata. */
 	_dif_generate_and_verify(&iov,
-				 4096 + 128, 128, false,
+				 4096 + 128, 128, true,
 				 SPDK_DIF_TYPE1, dif_flags,
 				 22, 22,
 				 0x22, 0xFFFF, 0x22,
@@ -191,7 +191,7 @@ dif_generate_and_verify_test(void)
 
 	/* The case that DIF is contained in the last 8 bytes of metadata. */
 	_dif_generate_and_verify(&iov,
-				 4096 + 128, 128, true,
+				 4096 + 128, 128, false,
 				 SPDK_DIF_TYPE1, dif_flags,
 				 22, 22,
 				 0x22, 0xFFFF, 0x22,
@@ -613,11 +613,11 @@ dif_inject_error_and_verify(struct iovec *iovs, int iovcnt,
 {
 	/* The case that DIF is contained in the first 8 bytes of metadata. */
 	_dif_inject_error_and_verify(iovs, iovcnt, block_size, md_size, num_blocks,
-				     inject_flags, false);
+				     inject_flags, true);
 
 	/* The case that DIF is contained in the last 8 bytes of metadata. */
 	_dif_inject_error_and_verify(iovs, iovcnt, block_size, md_size, num_blocks,
-				     inject_flags, true);
+				     inject_flags, false);
 }
 
 static void
@@ -935,12 +935,12 @@ dif_copy_inject_error_and_verify(struct iovec *iovs, int iovcnt, struct iovec *b
 	/* The case that DIF is contained in the first 8 bytes of metadata. */
 	_dif_copy_inject_error_and_verify(iovs, iovcnt, bounce_iov,
 					  block_size, md_size, num_blocks,
-					  inject_flags, false);
+					  inject_flags, true);
 
 	/* The case that DIF is contained in the last 8 bytes of metadata. */
 	_dif_copy_inject_error_and_verify(iovs, iovcnt, bounce_iov,
 					  block_size, md_size, num_blocks,
-					  inject_flags, true);
+					  inject_flags, false);
 }
 
 static void
@@ -1219,11 +1219,11 @@ dix_inject_error_and_verify(struct iovec *iovs, int iovcnt, struct iovec *md_iov
 {
 	/* The case that DIF is contained in the first 8 bytes of metadata. */
 	_dix_inject_error_and_verify(iovs, iovcnt, md_iov, block_size, md_size, num_blocks,
-				     inject_flags, false);
+				     inject_flags, true);
 
 	/* The case that DIF is contained in the last 8 bytes of metadata. */
 	_dix_inject_error_and_verify(iovs, iovcnt, md_iov, block_size, md_size, num_blocks,
-				     inject_flags, true);
+				     inject_flags, false);
 }
 
 static void