diff --git a/MdeModulePkg/Bus/Scsi/ScsiDiskDxe/ScsiDisk.c b/MdeModulePkg/Bus/Scsi/ScsiDiskDxe/ScsiDisk.c
index a85cc94ae6..3e19fad064 100644
--- a/MdeModulePkg/Bus/Scsi/ScsiDiskDxe/ScsiDisk.c
+++ b/MdeModulePkg/Bus/Scsi/ScsiDiskDxe/ScsiDisk.c
@@ -692,6 +692,11 @@ ScsiDiskWriteBlocks (
     goto Done;
   }
 
+  if (Media->ReadOnly) {
+    Status = EFI_WRITE_PROTECTED;
+    goto Done;
+  }
+
   if (BufferSize == 0) {
     Status = EFI_SUCCESS;
     goto Done;
@@ -1048,6 +1053,11 @@ ScsiDiskWriteBlocksEx (
     goto Done;
   }
 
+  if (Media->ReadOnly) {
+    Status = EFI_WRITE_PROTECTED;
+    goto Done;
+  }
+
   if (BufferSize == 0) {
     if ((Token != NULL) && (Token->Event != NULL)) {
       Token->TransactionStatus = EFI_SUCCESS;