diff --git a/src/dos_m65/assets/dos_parts_dir.s b/src/dos_m65/assets/dos_parts_dir.s
index a81e9e89..309d3703 100644
--- a/src/dos_m65/assets/dos_parts_dir.s
+++ b/src/dos_m65/assets/dos_parts_dir.s
@@ -40,6 +40,7 @@ dir_types:
 	!pet "prg", $00          ; PRG
 	!pet "usr", $00          ; USR
 	!pet "rel", $00          ; REL
+	!pet "cbm", $00          ; CBM-style partition
 	!pet "dir", $00          ; directory
 
 ; File types below are not mandatory
diff --git a/src/dos_m65/dev_sdcard/fs_hvsr_util_nextdirentry.s b/src/dos_m65/dev_sdcard/fs_hvsr_util_nextdirentry.s
index 5db911a3..4aeef26c 100644
--- a/src/dos_m65/dev_sdcard/fs_hvsr_util_nextdirentry.s
+++ b/src/dos_m65/dev_sdcard/fs_hvsr_util_nextdirentry.s
@@ -114,7 +114,7 @@ fs_hvsr_util_nextdirentry:
 
 	; Set the type to directory
 
-	lda #$05
+	lda #$06
 	bra @detect_attributes
 
 @entity_file:
@@ -169,7 +169,7 @@ fs_hvsr_util_nextdirentry:
 
 @lpext_found:
 
-	cpy #$10
+	cpy #$14
 	+beq fs_hvsr_util_nextdirentry     ; file extension 'DIR' does not mean this is a directory
 	tya
 
@@ -179,7 +179,7 @@ fs_hvsr_util_nextdirentry:
 	ror
 	inc
 
-	cmp #$06                           ; mark some file types (not SEQ/PRG/USR/REL/DIR) as read-only
+	cmp #$07                           ; mark some file types (not SEQ/PRG/USR/REL/CBM/DIR) as read-only
 	bcc @detect_attributes
 	ora #$40
 
diff --git a/src/dos_m65/utils/util_dir_filter.s b/src/dos_m65/utils/util_dir_filter.s
index 1c0adcdd..07751dee 100644
--- a/src/dos_m65/utils/util_dir_filter.s
+++ b/src/dos_m65/utils/util_dir_filter.s
@@ -85,7 +85,7 @@ util_dir_filter:
 
 @require_dir:
 
-	lda #$05
+	lda #$06
 
 	eor PAR_FTYPE
 	and #%00111111