diff --git a/BOOT/boot.asm b/BOOT/boot.asm
index f943d99..30be7ca 100644
--- a/BOOT/boot.asm
+++ b/BOOT/boot.asm
@@ -60,12 +60,12 @@ BEGIN:		in	a,(SLOT3)
 		ld	c,0			; узнать версию ДОС
 		rst	10h
 		ex	de,hl			; hl=тек. версия
-		ld	de,013Ch		; 1.60  d=версия, e=модификация, bc - номер сборки. de = #013E, bc = #0064 dos ver 1.62.100
+		ld	de,#013C		; 1.60  d=версия, e=модификация, bc - номер сборки. de = #013E, bc = #0064 dos ver 1.62.100
 		and	a
 		sbc	hl,de
 		jr	nc,version_ok
 		pop	hl
-		ld	a,9			; индекс строки "Error: Need DSS version 1.60..."
+		ld	a,11			; индекс строки "Error: Need DSS version 1.60..."
 		call	print_string
 		ld	a,-1
 		jp	exit
diff --git a/DSS/DOS_FM.ASM b/DSS/DOS_FM.ASM
index 02e6d30..b34e010 100644
--- a/DSS/DOS_FM.ASM
+++ b/DSS/DOS_FM.ASM
@@ -918,7 +918,7 @@ WOV3:	PUSH	HL
 ; 	LD	DE,#0000
 ; 	ADC	HL,DE
 ; 	RET 
-/////////////////////////////////////
+////////////// NEW //////////////////
 ; in:	HL - CLUSTER
 ; out:	HL:IX - SECTOR
 NSECTOR: DEC	HL
@@ -931,16 +931,16 @@ NSECTOR: DEC	HL
 	RRA
 .loop:	ADD	HL,HL
 	RL	E
-	RL	D
-	RRCA	
+	; RL	D
+	RRA	
 	JP	NC,.loop
 	;
 .skip:	EX	DE,HL
 	LD	XL,E
 	LD	XH,D
 	LD	DE,(FatBuffer.DAT_FRM)	;first data sector
+	XOR	A
 	ADD	IX,DE
-	; A=0
 	LD	D,A
 	LD	E,A
 	ADC	HL,DE
diff --git a/DSS/DOS_X.ASM b/DSS/DOS_X.ASM
index 46c67f8..e101e00 100644
--- a/DSS/DOS_X.ASM
+++ b/DSS/DOS_X.ASM
@@ -239,10 +239,11 @@ RD_BPB:	LD	C,SLOT3
 	 LD	H,(IY+_sBOOT_SEC.RESERVE+1)
 	;
 
-;	LD	E,(IY+#1C)    ;Hidden sec
-;	LD	D,(IY+#1D)
-;	ADD	HL,DE
-;	LD	(FatBuffer.FAT_FRM),HL  ;	first sector FAT
+	; LD	E,(IY+_sBOOT_SEC.HIDDEN)    ;Hidden sec
+	; LD	D,(IY+_sBOOT_SEC.HIDDEN+1)
+	; ADD	HL,DE
+	
+	;LD	(FatBuffer.FAT_FRM),HL  ;	first sector FAT
 	LD	(FatBuffer.FAT1_XX),HL  ;	first sector FAT #1
 	LD	(FatBuffer.FAT2_XX),HL
 
@@ -319,8 +320,7 @@ RD_BPB:	LD	C,SLOT3
 	LD	(FatBuffer.CLU_LEN),HL
 	EX	DE,HL
 	LD	HL,#3FFF	;!TODO FATcacheSize
-	;XOR	A
-	;  A = 0
+	XOR	A
 ;NEXTAD4	;!FIXIT оптимизировать когда понадобится
 .loop4:	INC	A
 	JP	Z,DOS_X_Error.UnknownBPB
@@ -376,8 +376,8 @@ RD_BPB:	LD	C,SLOT3
 ////////////////////////////////////////////////////////////////////////
 
 	LD	DE,(FatBuffer.DAT_FRM)
-;	LD	E,(IY+#1C)    ;Hidden sec
-;	LD	D,(IY+#1D)
+;	LD	E,(IY+_sBOOT_SEC.HIDDEN)    ;Hidden sec
+;	LD	D,(IY+_sBOOT_SEC.HIDDEN+1)
 ;	AND	A
 ;	SBC	HL,DE
 ;	EX	DE,HL
@@ -572,6 +572,9 @@ BACK_CUR_PATH:
 ;///////////////////////////////////////////////////////////////////////
 SCANDRV:
 ;1 [-----------] [-----------] [-----------] [-----------] [-----------]
+	; LD	A,(LDRIVE)
+	; LD	(.old_ldrive),A
+	;
 	CALL	GETBOOT
 	LD	(.old_letter),A	; bootdisk Log.number
 ;	 [-----------]
@@ -603,6 +606,9 @@ SCANDRV:
 	CALL	SETBOOT
 	JR	C,.ERROR_BOOTDRV_DIES
 	LD	(.new_letter),A
+	;
+	LD	A,(.old_letter)
+	LD	(BOOTDRV),A
 ;
 
 ;5 [-----------] [-----------] [-----------] [-----------] [-----------]
@@ -641,14 +647,31 @@ SCANDRV:
 	EX	DE,HL
 	LDDR
 	;	проверяем, не увеличилось ли значение LDRIVE
-	LD	HL,.old_letter
-	LD	A,(LDRIVE)
-	CP	(HL)
-	JR	NC,.no_change_LDRIVE
-	LD	A,(HL)
-	LD	(LDRIVE),A
+	;!TEST
+	 LD	HL,.old_letter
+	 LD	A,(LDRIVE)
+	 CP	(HL)
+	 JR	NC,.no_change_LDRIVE
+	 LD	A,(HL)
+	 LD	(LDRIVE),A
+	 ;
+; .old_ldrive+1:
+	 ;LD	L,0
+	 ;LD	A,(LDRIVE)
+	 ;CP	L
+	 ;JR	NC,.no_change_LDRIVE
+	 ;LD	A,L
+	 ;LD	(LDRIVE),A
+	;
 .no_change_LDRIVE:
 	;
+	; DEC	A
+	; LD	C,Dss.DskInfo
+	; RST	ToDSS
+	; LD	A,(BOOTDRV)
+	; LD	C,Dss.ChDisk
+	; RST	ToDSS
+
 	;;;;;
 .restore_page+1:
 	LD	A,0
diff --git a/DSS/build.txt b/DSS/build.txt
index c2567dc..da4c6e9 100644
--- a/DSS/build.txt
+++ b/DSS/build.txt
@@ -1 +1 @@
-280
\ No newline at end of file
+297
\ No newline at end of file
diff --git a/DSS/defines.inc b/DSS/defines.inc
index 675eadc..5246fad 100644
--- a/DSS/defines.inc
+++ b/DSS/defines.inc
@@ -4,7 +4,7 @@
 
 ;
  DEFINE SHORT_RSTx10_TABLE	0			; укороченная таблица функций rst #10. 96 функций.
- DEFINE COMPILE_UNUSED_CODE	0
+ DEFINE COMPILE_UNUSED_CODE	1
 ;
 
 ;