diff --git a/rtfs/lib/fs/rtfs/init.lua b/rtfs/lib/fs/rtfs/init.lua
index a037187..1f55527 100644
--- a/rtfs/lib/fs/rtfs/init.lua
+++ b/rtfs/lib/fs/rtfs/init.lua
@@ -1,3 +1,6 @@
+local fs = fs or require "filesystem"
+local component = require "component"
+local computer = require "computer"
 local cache = (package.loaded["fs.rtfs"] or {}).cache or {hitsR=0, hitsW=0, missesR=0, missesW=0}
 local proxy = {}
 local rtfs = {proxy=proxy, cache=cache}
diff --git a/rtfs/lib/fs/rtfs/v1.lua b/rtfs/lib/fs/rtfs/v1.lua
index 70358da..1680b58 100644
--- a/rtfs/lib/fs/rtfs/v1.lua
+++ b/rtfs/lib/fs/rtfs/v1.lua
@@ -1,3 +1,4 @@
+local fs = fs or require "filesystem"
 local common = require "fs.rtfs"
 local rtfs, proxy = {}, setmetatable({},{__index=common.proxy})
 local ieformat = ">I2I8I8c46" -- type (4 bits) and index (12 bits), start sector (32 bits), lenth in bytes (32 bits), name/path (46 bytes)
@@ -373,7 +374,7 @@ function proxy:compactIndex(ti)
  return ri
 end
 
-function rtfs.mount(p)
+function rtfs.mount(p,ro)
  local d = common.getProxy(p)
  local p = setmetatable({}, {__index=proxy})
  p.d = d
@@ -420,7 +421,7 @@ function rtfs.mount(p)
  function p.spaceTotal()
   return p.capacity - (math.ceil(p.isize / (p.blockSize / iesize))*p.blockSize) - p.blockSize
  end
- p.isReadOnly = p.d.isReadOnly
+ p.isReadOnly = p.d.isReadOnly or function() return ro or false end
 
  function p.list(name)
   name = fnormalize(name)