diff --git a/boot/freeldr/freeldr/arch/uefi/uefidisk.c b/boot/freeldr/freeldr/arch/uefi/uefidisk.c
index 2d5458d4707..98d19b346f1 100644
--- a/boot/freeldr/freeldr/arch/uefi/uefidisk.c
+++ b/boot/freeldr/freeldr/arch/uefi/uefidisk.c
@@ -415,7 +415,7 @@ UefiSetupBlockDevices(VOID)
         if (EFI_ERROR(Status) || 
             bio == NULL ||
             bio->Media->BlockSize == 0 ||
-            bio->Media->BlockSize > 2048)
+            bio->Media->BlockSize > 4096)
         {
             TRACE("UefiSetupBlockDevices: UEFI has found a block device that failed, skipping\n");
             continue;
diff --git a/boot/freeldr/freeldr/lib/fs/fat.c b/boot/freeldr/freeldr/lib/fs/fat.c
index 1b5ad239e1f..556f8086430 100644
--- a/boot/freeldr/freeldr/lib/fs/fat.c
+++ b/boot/freeldr/freeldr/lib/fs/fat.c
@@ -1369,7 +1369,7 @@ BOOLEAN FatReadVolumeSectors(PFAT_VOLUME_INFO Volume, ULONG SectorNumber, ULONG
     //
     // Seek to right position
     //
-    Position.QuadPart = (ULONGLONG)SectorNumber * 512;
+    Position.QuadPart = (ULONGLONG)SectorNumber * Volume->BytesPerSector;
     Status = ArcSeek(Volume->DeviceId, &Position, SeekAbsolute);
     if (Status != ESUCCESS)
     {
@@ -1380,8 +1380,8 @@ BOOLEAN FatReadVolumeSectors(PFAT_VOLUME_INFO Volume, ULONG SectorNumber, ULONG
     //
     // Read data
     //
-    Status = ArcRead(Volume->DeviceId, Buffer, SectorCount * 512, &Count);
-    if (Status != ESUCCESS || Count != SectorCount * 512)
+    Status = ArcRead(Volume->DeviceId, Buffer, SectorCount * Volume->BytesPerSector, &Count);
+    if (Status != ESUCCESS || Count != SectorCount * Volume->BytesPerSector)
     {
         TRACE("FatReadVolumeSectors() Failed to read\n");
         return FALSE;