diff --git a/libisofs/ecma119.c b/libisofs/ecma119.c
index a1ac681..8de00dd 100755
--- a/libisofs/ecma119.c
+++ b/libisofs/ecma119.c
@@ -146,6 +146,7 @@ calc_dir_size(struct ecma119_write_target *t,
 	      struct ecma119_tree_node *dir)
 {
 	size_t i;
+	size_t newlen;
 
 	assert(dir->type == ECMA119_DIR);
 
@@ -157,7 +158,13 @@ calc_dir_size(struct ecma119_write_target *t,
 	for (i = 0; i < dir->dir.nchildren; i++) {
 		struct ecma119_tree_node *ch = dir->dir.children[i];
 
-		dir->dir.len += ch->dirent_len + ch->susp.non_CE_len;
+		newlen = dir->dir.len + ch->dirent_len + ch->susp.non_CE_len;
+		if ((newlen % 2048) < (dir->dir.len % 2048)) {
+			dir->dir.len = newlen + (2048 - (dir->dir.len % 2048));
+		}
+		else {
+			dir->dir.len += ch->dirent_len + ch->susp.non_CE_len;
+		}
 		dir->dir.CE_len += ch->susp.CE_len;
 	}
 	t->total_dir_size += round_up(dir->dir.len + dir->dir.CE_len,
@@ -567,7 +574,10 @@ write_one_dir(struct ecma119_write_target *t,
 	      uint8_t *buf)
 {
 	size_t i;
+	int j;
+	size_t len;
 	uint8_t *orig_buf = buf;
+	uint8_t *prior_buf = buf;
 
 	assert(dir->type == ECMA119_DIR);
 	/* write the "." and ".." entries first */
@@ -579,7 +589,18 @@ write_one_dir(struct ecma119_write_target *t,
 
 	for (i = 0; i < dir->dir.nchildren; i++) {
 		write_one_dir_record(t, dir->dir.children[i], -1, buf);
-		buf += ((struct ecma119_dir_record*) buf)->len_dr[0];
+		len = ((struct ecma119_dir_record*) buf)->len_dr[0];
+		if ((buf + len - prior_buf) >= 2048) {
+			for (j = len - 1; j >= 0; j--) {
+				prior_buf[2048 + j] = buf[j];
+				buf[j] = 0;
+			}
+			prior_buf += 2048;
+			buf = prior_buf + len;
+		}
+		else {
+			buf += ((struct ecma119_dir_record*) buf)->len_dr[0];
+		}
 	}
 
 	/* write the susp continuation areas */
diff --git a/libisofs/joliet.c b/libisofs/joliet.c
index d64675b..34be4d1 100644
--- a/libisofs/joliet.c
+++ b/libisofs/joliet.c
@@ -101,6 +101,7 @@ joliet_calc_dir_size(struct ecma119_write_target *t,
 		     struct joliet_tree_node *root)
 {
 	size_t i;
+	size_t newlen;
 	struct joliet_tree_node *ch;
 
 	assert(root && ISO_ISDIR(root->iso_self));
@@ -108,7 +109,13 @@ joliet_calc_dir_size(struct ecma119_write_target *t,
 	root->len = 68; /* for "." and ".." entries */
 	for (i = 0; i < root->nchildren; i++) {
 		ch = root->children[i];
-		root->len += ch->dirent_len;
+		newlen = root->len + ch->dirent_len;
+		if ((newlen % 2048) < (root->len % 2048)) {
+			root->len = newlen + (2048 - (root->len % 2048));
+		}
+		else {
+			root->len += ch->dirent_len;
+		}
 		if (ISO_ISDIR(ch->iso_self))
 			joliet_calc_dir_size(t, ch);
 	}
@@ -305,7 +312,10 @@ write_one_dir(struct ecma119_write_target *t,
 	      uint8_t *buf)
 {
 	size_t i;
+	int j;
+	size_t len;
 	uint8_t *orig_buf = buf;
+	uint8_t *prior_buf = buf;
 
 	assert(ISO_ISDIR (dir->iso_self));
 	/* write the "." and ".." entries first */
@@ -317,7 +327,18 @@ write_one_dir(struct ecma119_write_target *t,
 
 	for (i = 0; i < dir->nchildren; i++) {
 		write_one_dir_record(t, dir->children[i], -1, buf);
-		buf += ((struct ecma119_dir_record*) buf)->len_dr[0];
+		len = ((struct ecma119_dir_record*) buf)->len_dr[0];
+		if ((buf + len - prior_buf) >= 2048) {
+			for (j = len - 1; j >= 0; j--) {
+				prior_buf[2048 + j] = buf[j];
+				buf[j] = 0;
+			}
+			prior_buf += 2048;
+			buf = prior_buf + len;
+		}
+		else {
+			buf += ((struct ecma119_dir_record*) buf)->len_dr[0];
+		}
 	}
 
 	assert (buf - orig_buf == dir->len);