[fat] align start of data region to MB

* Closes #2387

Author: slackingfred

src/format_fat32.c

@@ -175,6 +175,7 @@ BOOL FormatLargeFAT32(DWORD DriveIndex, uint64_t PartitionOffset, DWORD ClusterS
 	DWORD BytesPerSect = 0;
 	DWORD SectorsPerCluster = 0;
 	DWORD TotalSectors = 0;
+	DWORD AlignSectors = 0;
 	DWORD SystemAreaSize = 0;
 	DWORD UserAreaSize = 0;
 	ULONGLONG qTotalSectors = 0;
@@ -295,7 +296,6 @@ BOOL FormatLargeFAT32(DWORD DriveIndex, uint64_t PartitionOffset, DWORD ClusterS
 	SectorsPerCluster = ClusterSize / BytesPerSect;
 
 	pFAT32BootSect->bSecPerClus = (BYTE)SectorsPerCluster;
-	pFAT32BootSect->wRsvdSecCnt = (WORD)ReservedSectCount;
 	pFAT32BootSect->bNumFATs = (BYTE)NumFATs;
 	pFAT32BootSect->wRootEntCnt = 0;
 	pFAT32BootSect->wTotSec16 = 0;
@@ -310,6 +310,13 @@ BOOL FormatLargeFAT32(DWORD DriveIndex, uint64_t PartitionOffset, DWORD ClusterS
 	FatSize = GetFATSizeSectors(pFAT32BootSect->dTotSec32, pFAT32BootSect->wRsvdSecCnt,
 		pFAT32BootSect->bSecPerClus, pFAT32BootSect->bNumFATs, BytesPerSect);
 
+	// Update reserved sector count so that the start of data region is aligned to a MB boundary
+	SystemAreaSize = ReservedSectCount + NumFATs * FatSize;
+	AlignSectors = (1 * MB) / BytesPerSect;
+	SystemAreaSize = (SystemAreaSize + AlignSectors - 1) / AlignSectors * AlignSectors;
+	ReservedSectCount = SystemAreaSize - NumFATs * FatSize;
+
+	pFAT32BootSect->wRsvdSecCnt = (WORD)ReservedSectCount;
 	pFAT32BootSect->dFATSz32 = FatSize;
 	pFAT32BootSect->wExtFlags = 0;
 	pFAT32BootSect->wFSVer = 0;

src/rufus.rc

@@ -33,7 +33,7 @@ LANGUAGE LANG_NEUTRAL, SUBLANG_NEUTRAL
 IDD_DIALOG DIALOGEX 12, 12, 232, 326
 STYLE DS_SETFONT | DS_MODALFRAME | DS_CENTER | WS_MINIMIZEBOX | WS_POPUP | WS_CAPTION | WS_SYSMENU
 EXSTYLE WS_EX_ACCEPTFILES
-CAPTION "Rufus 4.4.2098"
+CAPTION "Rufus 4.4.2099"
 FONT 9, "Segoe UI Symbol", 400, 0, 0x0
 BEGIN
     LTEXT           "Drive Properties",IDS_DRIVE_PROPERTIES_TXT,8,6,53,12,NOT WS_GROUP
@@ -392,8 +392,8 @@ END
 //
 
 VS_VERSION_INFO VERSIONINFO
- FILEVERSION 4,4,2098,0
- PRODUCTVERSION 4,4,2098,0
+ FILEVERSION 4,4,2099,0
+ PRODUCTVERSION 4,4,2099,0
  FILEFLAGSMASK 0x3fL
 #ifdef _DEBUG
  FILEFLAGS 0x1L
@@ -411,13 +411,13 @@ BEGIN
             VALUE "Comments", "https://rufus.ie"
             VALUE "CompanyName", "Akeo Consulting"
             VALUE "FileDescription", "Rufus"
-            VALUE "FileVersion", "4.4.2098"
+            VALUE "FileVersion", "4.4.2099"
             VALUE "InternalName", "Rufus"
             VALUE "LegalCopyright", "� 2011-2024 Pete Batard (GPL v3)"
             VALUE "LegalTrademarks", "https://www.gnu.org/licenses/gpl-3.0.html"
             VALUE "OriginalFilename", "rufus-4.4.exe"
             VALUE "ProductName", "Rufus"
-            VALUE "ProductVersion", "4.4.2098"
+            VALUE "ProductVersion", "4.4.2099"
         END
     END
     BLOCK "VarFileInfo"