--- DISK3.ASM	2024-04-26 22:35:22.545000000 -0700
+++ disk3.bak	2024-04-26 22:25:28.000000000 -0700
@@ -121,61 +121,65 @@
 	JCXZ    WRTEOFJ                 ;Make the file length = sf_position
 	ADD     AX,CX
 	ADC     DX,0                    ; AX:DX=byte after last byte accessed
 ;
 ; Make sure divide won't overflow
 ;
 	MOV     BX,ES:[BP.dpb_sector_size]
 ;       CMP     DX,BX                   ;F.C. >32mb  16 bit sector check        ;AN000;
 ;       JAE     WrtErr                  ;F.C. >32mb                             ;AN000;
 
 	CALL    DIV32                   ;F.C. perform 32 bit divide             ;AN000;
 	MOV     BX,AX                   ; Save last full sector
+	PUSH    [HIGH_SECTOR]           ;F.C. >32mb                             ;AN000;        
 	OR      DX,DX
 	JNZ     CALCLUS
 	SUB     AX,1                    ; AX must be zero base indexed          ;AC000;
 	SBB     [HIGH_SECTOR],0         ;F.C. >32mb                             ;AN000;
 CALCLUS:
-	PUSH    [HIGH_SECTOR]           ;F.C. >32mb                             ;AN000;
 	CALL    SHR32                   ;F.C. >32mb                             ;AN000;
 	POP     [HIGH_SECTOR]           ;F.C. >32mb                             ;AN000;
 
 ;       SHR     AX,CL                   ; Last cluster to be accessed
 	PUSH    AX
 	PUSH    DX                      ; Save the size of the "tail"
 	PUSH    ES
 	LES     DI,[THISSFT]
 	Assert  ISSFT,<ES,DI>,"DiskWrite/CalClus"
 	MOV     AX,WORD PTR ES:[DI.sf_size]
 	MOV     DX,WORD PTR ES:[DI.sf_size+2]
 	POP     ES
 
 
 
 	PUSH    AX                      ;F.C. >32mb                             ;AN000;
 	MOV     AX,DX                   ;F.C. >32mb                             ;AN000;
 	XOR     DX,DX                   ;F.C. >32mb                             ;AN000;
 	DIV     ES:[BP.dpb_sector_size] ;F.C. >32mb                             ;AN000;
 	MOV     [HIGH_SECTOR_TEMP],AX   ;F.C. >32mb                             ;AN000;
+	MOV     [VALSEC+2],AX           ;F.C. >32mb                             ;AN000;
 	POP     AX                      ;F.C. >32mb                             ;AN000;
 
 	DIV     ES:[BP.dpb_sector_size]
 	MOV     CX,AX           ; Save last full sector of current file
 	OR      DX,DX
 	JZ      NORNDUP
 	ADD     AX,1            ; Round up if any remainder                     ;AC000;
-	ADC     [HIGH_SECTOR_TEMP],0    ;F.C. >32mb                             ;AN000;
+	ADC     [VALSEC+2],0            ;F.C. >32mb                             ;AN000;
 NORNDUP:
-	PUSH    [HIGH_SECTOR_TEMP]      ;F.C. >32mb                             ;AN000;
-	POP     WORD PTR [VALSEC+2]     ;F.C. >32mb                             ;AN000;
+	NOP     ; Unneccessary but used to preserve alignment with
+	NOP     ; previous code and ensure binary comparison with
+	NOP     ; official fix
+	NOP
+	NOP
 	MOV     WORD PTR [VALSEC],AX  ;Number of sectors that have been written
 	XOR     AX,AX
 	MOV     WORD PTR [GROWCNT],AX
 	MOV     WORD PTR [GROWCNT+2],AX
 	POP     AX
 
 	MOV     DI,[HIGH_SECTOR]        ;F.C. >32mb                             ;AN000;
 	CMP     DI,[HIGH_SECTOR_TEMP]   ;F.C. >32mb                             ;AN000;
 	JB      NOGROW                  ;F.C. >32mb                             ;AN000;
 	JZ      lowsec                  ;F.C. >32mb                             ;AN000;
 	SUB     BX,CX                   ;F.C. >32mb                             ;AN000;
 	SBB     DI,[HIGH_SECTOR_TEMP]   ;F.C. >32mb di:bx no. of sectors        ;AN000;