diff --git a/Source/HBIOS/md.asm b/Source/HBIOS/md.asm
index 9c26c860..ac1fd6e8 100644
--- a/Source/HBIOS/md.asm
+++ b/Source/HBIOS/md.asm
@@ -378,6 +378,8 @@ MD_SECM1:				; DESIRED SECTOR IS IN BUFFER
 	PUSH	IX
 	CALL	MD_FERAS		; ERASE 4K SECTOR
 	POP	IX
+	OR	A
+	RET	NZ			; RETURN IF ERROR
 ;
 	PUSH	HL
 	PUSH	DE
@@ -405,9 +407,9 @@ MD_SECM1:				; DESIRED SECTOR IS IN BUFFER
 	LD	IX,MD_F4KBUF		; WRITE THE SECTOR
 	CALL	MD_FWRIT
 	POP	IX
-
+;
 	XOR	A
-
+;
 	RET
 ;
 MD_LBA4K	.DW	$FFFF		; LBA OF CURRENT SECTOR
@@ -613,7 +615,7 @@ MDSTR_LEN	.TEXT	"LEN=$"
 ;==================================================================================================
 ;
 #IF (MDFFENABLE)
-FF_TGT		.EQU	0B7BFH		; TARGET CHIP FOR R/W FILESYSTEM
+MD_TGTDEV	.EQU	0B7BFH		; TARGET CHIP FOR R/W FILESYSTEM 39SF040
 ;
 ;======================================================================
 ; BIOS FLASH INITIALIZATION
@@ -624,7 +626,7 @@ FF_TGT		.EQU	0B7BFH		; TARGET CHIP FOR R/W FILESYSTEM
 ;
 MD_FINIT:
 	LD	A,+(ROMSIZE/512)	; DISLAY NUMBER
-#IF	(MD_FVBS==1)
+#IF (MD_FVBS==1)
 	CALL	NEWLINE			; OF UNITS 
 	PRTS("MD: FLASH=$")
 	CALL	PRTDECB			; CONFIGURED FOR.
@@ -638,7 +640,7 @@ FF_PROBE:
 	LD	L,D			; ON EACH CYCLE THROUGH
 ;	 
 	PUSH	BC
-#IF	(MD_FVBS==1)
+#IF (MD_FVBS==1)
 	CALL	PC_SPACE
 	LD	A,+(ROMSIZE/512)+1
 	SUB	B			; PRINT
@@ -650,8 +652,7 @@ FF_PROBE:
 
 	PUSH	HL
 ;	PUSH	DE
-	LD	HL,FF_TGT		; IF WE MATCH WITH
-;	LD	L,FF_TGT&$FF
+	LD	HL,MD_TGTDEV		; IF WE MATCH WITH
 	XOR	A			; A NON 39SF040
 	SBC	HL,BC			; CHIP SET THE
 	LD	A,(MD_FFSEN)		; R/W FLAG TO R/O
@@ -905,7 +906,7 @@ MD_I_SZ	.EQU	$-MD_FIDENT_R		; SIZE OF RELOCATABLE CODE BUFFER REQUIRED
 ;  RETURN WITH STATUS CODE.
 ;
 ; ON ENTRY DE:HL POINTS TO AN ADDRESS IDENTIFYING THE CHIP
-; ON EXIT  A     RETURNS STATUS FLASH 0=SUCCESS FF=FAIL
+; ON EXIT  A     RETURNS STATUS 0=SUCCESS NZ=FAIL
 ;======================================================================
 ;
 MD_FERAS:
@@ -928,7 +929,7 @@ MD_FERAS:
 ;
 ; ON ENTRY BC CONTAINS BANK AND SECTOR DATA
 ;          A  CONTAINS CURRENT BANK 
-; ON EXIT  A  RETURNS STATUS FLASH 0=SUCCESS FAIL=NZ
+; ON EXIT  C  RETURNS STATUS 0=SUCCESS NZ=FAIL
 ;======================================================================
 ;
 MD_FERAS_R:				; THIS CODE GETS RELOCATED TO HIGH MEMORY
@@ -1005,6 +1006,7 @@ MD_S_SZ	.EQU	$-MD_FERAS_R		; SIZE OF RELOCATABLE CODE BUFFER REQUIRED
 ;
 ; ON ENTRY DE:HL POINTS TO A 32 BIT MEMORY ADDRESS.
 ;          IX    POINTS TO WHERE TO SAVE DATA
+; ON EXIT  NO STATUS IS RETURNED
 ;======================================================================
 ;
 MD_FREAD:
@@ -1088,6 +1090,7 @@ MD_R_SZ	.EQU	$-MD_FREAD_R		; SIZE OF RELOCATABLE CODE BUFFER REQUIRED
 ;
 ; ON ENTRY DE:HL POINTS TO A 32 BIT MEMORY ADDRESS.
 ;          IX    POINTS TO DATA TO BE WRITTEN
+; ON EXIT  NO STATUS IS RETURNED
 ;======================================================================
 ;
 MD_FWRIT:
@@ -1118,7 +1121,7 @@ MD_FWRIT:
 ;          IX POINTS TO DATA TO BE WRITTEN
 ;          DE = 0000 BYTE COUNT
 ;          A  CONTAINS CURRENT BANK 
-; ON EXIT  A  RETURNS STATUS FLASH 0=SUCCESS FF=FAIL
+; ON EXIT  NO STATUS IS RETURNED
 ;======================================================================
 ;
 MD_FWRIT_R:				; THIS CODE GETS RELOCATED TO HIGH MEMORY
@@ -1226,7 +1229,7 @@ MD_FFSEN	.DB	00h		; FLASH FILES SYSTEM ENABLE
 ;
 ;======================================================================
 ;
-#IF (MD_FDBG==0)
+#IF (MD_FDBG==1)
 		.ECHO	"MD_FIDENT_R "
 		.ECHO	MD_I_SZ
 		.ECHO	"\n"