diff --git a/ports/esp32/modules/_boot.py b/ports/esp32/modules/_boot.py
index 651fc7b10c..96af581f38 100644
--- a/ports/esp32/modules/_boot.py
+++ b/ports/esp32/modules/_boot.py
@@ -1,13 +1,13 @@
 import gc
-import os
+import vfs
 from flashbdev import bdev
 
 try:
     if bdev:
-        os.mount(bdev, "/")
+        vfs.mount(bdev, "/")
 except OSError:
     import inisetup
 
-    vfs = inisetup.setup()
+    inisetup.setup()
 
 gc.collect()
diff --git a/ports/esp32/modules/inisetup.py b/ports/esp32/modules/inisetup.py
index 2003864e9f..4e9b462fb3 100644
--- a/ports/esp32/modules/inisetup.py
+++ b/ports/esp32/modules/inisetup.py
@@ -1,4 +1,4 @@
-import os
+import vfs
 from flashbdev import bdev
 
 
@@ -38,12 +38,12 @@ def setup():
     check_bootsec()
     print("Performing initial setup")
     if bdev.info()[4] == "vfs":
-        os.VfsLfs2.mkfs(bdev)
-        vfs = os.VfsLfs2(bdev)
+        vfs.VfsLfs2.mkfs(bdev)
+        fs = vfs.VfsLfs2(bdev)
     elif bdev.info()[4] == "ffat":
-        os.VfsFat.mkfs(bdev)
-        vfs = os.VfsFat(bdev)
-    os.mount(vfs, "/")
+        vfs.VfsFat.mkfs(bdev)
+        fs = vfs.VfsFat(bdev)
+    vfs.mount(fs, "/")
     with open("boot.py", "w") as f:
         f.write(
             """\
@@ -54,4 +54,4 @@ def setup():
 #webrepl.start()
 """
         )
-    return vfs
+    return fs
diff --git a/ports/esp8266/boards/ESP8266_GENERIC/board.md b/ports/esp8266/boards/ESP8266_GENERIC/board.md
index 96fbab617a..e8d63fcead 100644
--- a/ports/esp8266/boards/ESP8266_GENERIC/board.md
+++ b/ports/esp8266/boards/ESP8266_GENERIC/board.md
@@ -13,7 +13,7 @@ Note: v1.12-334 and newer (including v1.13) require an ESP8266 module with
 2MiB of flash or more, and use littlefs as the filesystem by default.  When
 upgrading from older firmware please backup your files first, and either
 erase all flash before upgrading, or after upgrading execute
-`os.VfsLfs2.mkfs(bdev)`.
+`vfs.VfsLfs2.mkfs(bdev)`.
 
 ### OTA builds
 Over-The-Air (OTA) builds of the ESP8266 firmware are also provided.
diff --git a/ports/esp8266/modules/_boot.py b/ports/esp8266/modules/_boot.py
index 06b372990a..00a0d6550f 100644
--- a/ports/esp8266/modules/_boot.py
+++ b/ports/esp8266/modules/_boot.py
@@ -1,12 +1,12 @@
 import gc
 
 gc.threshold((gc.mem_free() + gc.mem_alloc()) // 4)
-import os
+import vfs
 from flashbdev import bdev
 
 if bdev:
     try:
-        os.mount(bdev, "/")
+        vfs.mount(bdev, "/")
     except:
         import inisetup
 
diff --git a/ports/esp8266/modules/inisetup.py b/ports/esp8266/modules/inisetup.py
index 3f3edcf6d0..20bb28e80b 100644
--- a/ports/esp8266/modules/inisetup.py
+++ b/ports/esp8266/modules/inisetup.py
@@ -1,4 +1,4 @@
-import os
+import vfs
 import network
 from flashbdev import bdev
 
@@ -36,7 +36,7 @@ def fs_corrupted():
             """\
 The filesystem starting at sector %d with size %d sectors looks corrupt.
 You may want to make a flash snapshot and try to recover it. Otherwise,
-format it with os.VfsLfs2.mkfs(bdev), or completely erase the flash and
+format it with vfs.VfsLfs2.mkfs(bdev), or completely erase the flash and
 reprogram MicroPython.
 """
             % (bdev.start_sec, bdev.blocks)
@@ -48,9 +48,9 @@ def setup():
     check_bootsec()
     print("Performing initial setup")
     wifi()
-    os.VfsLfs2.mkfs(bdev)
-    vfs = os.VfsLfs2(bdev)
-    os.mount(vfs, "/")
+    vfs.VfsLfs2.mkfs(bdev)
+    fs = vfs.VfsLfs2(bdev)
+    vfs.mount(fs, "/")
     with open("boot.py", "w") as f:
         f.write(
             """\
diff --git a/ports/mimxrt/boards/TEENSY40/format.py b/ports/mimxrt/boards/TEENSY40/format.py
index 75e5aa95ca..1204ac240c 100644
--- a/ports/mimxrt/boards/TEENSY40/format.py
+++ b/ports/mimxrt/boards/TEENSY40/format.py
@@ -1,11 +1,11 @@
 # format.py
 # Re-create the file system
 
-import os
+import vfs
 import mimxrt
 
 bdev = mimxrt.Flash()
 
-os.VfsLfs2.mkfs(bdev, progsize=256)
-vfs = os.VfsLfs2(bdev, progsize=256)
-os.mount(vfs, "/")
+vfs.VfsLfs2.mkfs(bdev, progsize=256)
+fs = vfs.VfsLfs2(bdev, progsize=256)
+vfs.mount(fs, "/")
diff --git a/ports/mimxrt/modules/_boot.py b/ports/mimxrt/modules/_boot.py
index 56f12a4ce1..fa3b780434 100644
--- a/ports/mimxrt/modules/_boot.py
+++ b/ports/mimxrt/modules/_boot.py
@@ -3,17 +3,18 @@
 # Note: the flash requires the programming size to be aligned to 256 bytes.
 
 import os
+import vfs
 import sys
 import mimxrt
 from machine import Pin
 
 bdev = mimxrt.Flash()
 try:
-    vfs = os.VfsLfs2(bdev, progsize=256)
+    fs = vfs.VfsLfs2(bdev, progsize=256)
 except:
-    os.VfsLfs2.mkfs(bdev, progsize=256)
-    vfs = os.VfsLfs2(bdev, progsize=256)
-os.mount(vfs, "/flash")
+    vfs.VfsLfs2.mkfs(bdev, progsize=256)
+    fs = vfs.VfsLfs2(bdev, progsize=256)
+vfs.mount(fs, "/flash")
 os.chdir("/flash")
 sys.path.append("/flash")
 sys.path.append("/flash/lib")
@@ -27,8 +28,8 @@ except:
 
         sdcard = SDCard(1)
 
-        fat = os.VfsFat(sdcard)
-        os.mount(fat, "/sdcard")
+        fat = vfs.VfsFat(sdcard)
+        vfs.mount(fat, "/sdcard")
         os.chdir("/sdcard")
         sys.path.append("/sdcard")
     except:
diff --git a/ports/nrf/examples/mountsd.py b/ports/nrf/examples/mountsd.py
index 315205c695..3752259615 100644
--- a/ports/nrf/examples/mountsd.py
+++ b/ports/nrf/examples/mountsd.py
@@ -20,7 +20,7 @@ Direct wiring on SD card (SPI):
   ---------------------------------
 """
 
-import os
+import os, vfs
 from machine import SPI, Pin
 from sdcard import SDCard
 
@@ -28,7 +28,7 @@ from sdcard import SDCard
 def mnt():
     cs = Pin("P22", mode=Pin.OUT)
     sd = SDCard(SPI(0), cs)
-    os.mount(sd, "/")
+    vfs.mount(sd, "/")
 
 
 def list():
diff --git a/ports/nrf/examples/seeed_tft.py b/ports/nrf/examples/seeed_tft.py
index fc0617f20b..f53b560226 100644
--- a/ports/nrf/examples/seeed_tft.py
+++ b/ports/nrf/examples/seeed_tft.py
@@ -44,7 +44,7 @@ Example usage of SD card reader:
     tf = mount_tf()
     os.listdir()
 """
-import os
+import vfs
 import time
 import framebuf
 
@@ -54,7 +54,7 @@ from sdcard import SDCard
 
 def mount_tf(self, mount_point="/"):
     sd = SDCard(SPI(0), Pin("P15", mode=Pin.OUT))
-    os.mount(sd, mount_point)
+    vfs.mount(sd, mount_point)
 
 
 class ILI9341:
diff --git a/ports/nrf/modules/scripts/_mkfs.py b/ports/nrf/modules/scripts/_mkfs.py
index 02e8dabce2..601f9558eb 100644
--- a/ports/nrf/modules/scripts/_mkfs.py
+++ b/ports/nrf/modules/scripts/_mkfs.py
@@ -1,19 +1,19 @@
-import os, nrf
+import vfs, nrf
 
 try:
-    from os import VfsLfs1
+    from vfs import VfsLfs1
 
-    os.VfsLfs1.mkfs(nrf.Flash())
+    vfs.VfsLfs1.mkfs(nrf.Flash())
 except ImportError:
     try:
-        from os import VfsLfs2
+        from vfs import VfsLfs2
 
-        os.VfsLfs2.mkfs(nrf.Flash())
+        vfs.VfsLfs2.mkfs(nrf.Flash())
     except ImportError:
         try:
-            from os import VfsFat
+            from vfs import VfsFat
 
-            os.VfsFat.mkfs(nrf.Flash())
+            vfs.VfsFat.mkfs(nrf.Flash())
         except ImportError:
             pass
         except OSError as e:
diff --git a/ports/rp2/modules/_boot.py b/ports/rp2/modules/_boot.py
index 099e5aba05..71cb28d682 100644
--- a/ports/rp2/modules/_boot.py
+++ b/ports/rp2/modules/_boot.py
@@ -1,4 +1,4 @@
-import os
+import vfs
 import machine, rp2
 
 
@@ -6,10 +6,10 @@ import machine, rp2
 # Note: the flash requires the programming size to be aligned to 256 bytes.
 bdev = rp2.Flash()
 try:
-    vfs = os.VfsLfs2(bdev, progsize=256)
+    fs = vfs.VfsLfs2(bdev, progsize=256)
 except:
-    os.VfsLfs2.mkfs(bdev, progsize=256)
-    vfs = os.VfsLfs2(bdev, progsize=256)
-os.mount(vfs, "/")
+    vfs.VfsLfs2.mkfs(bdev, progsize=256)
+    fs = vfs.VfsLfs2(bdev, progsize=256)
+vfs.mount(fs, "/")
 
-del os, bdev, vfs
+del vfs, bdev, fs
diff --git a/ports/rp2/modules/_boot_fat.py b/ports/rp2/modules/_boot_fat.py
index 02a2df9bab..5220584455 100644
--- a/ports/rp2/modules/_boot_fat.py
+++ b/ports/rp2/modules/_boot_fat.py
@@ -1,15 +1,14 @@
-import os
+import vfs
 import machine, rp2
 
 
 # Try to mount the filesystem, and format the flash if it doesn't exist.
 bdev = rp2.Flash()
 try:
-    vfs = os.VfsFat(bdev)
-    os.mount(vfs, "/")
+    fs = vfs.VfsFat(bdev)
 except:
-    os.VfsFat.mkfs(bdev)
-    vfs = os.VfsFat(bdev)
-os.mount(vfs, "/")
+    vfs.VfsFat.mkfs(bdev)
+    fs = vfs.VfsFat(bdev)
+vfs.mount(fs, "/")
 
-del os, bdev, vfs
+del vfs, bdev, fs
diff --git a/ports/samd/modules/_boot.py b/ports/samd/modules/_boot.py
index 93522e2ea3..f4053e2cdd 100644
--- a/ports/samd/modules/_boot.py
+++ b/ports/samd/modules/_boot.py
@@ -1,21 +1,21 @@
 import gc
-import os
+import vfs
 import samd
 import sys
 
 bdev = samd.Flash()
 
 # Try to mount the filesystem, and format the flash if it doesn't exist.
-fs_type = os.VfsLfs2 if hasattr(os, "VfsLfs2") else os.VfsLfs1
+fs_type = vfs.VfsLfs2 if hasattr(vfs, "VfsLfs2") else vfs.VfsLfs1
 
 try:
-    vfs = fs_type(bdev, progsize=256)
+    fs = fs_type(bdev, progsize=256)
 except:
     fs_type.mkfs(bdev, progsize=256)
-    vfs = fs_type(bdev, progsize=256)
-os.mount(vfs, "/")
+    fs = fs_type(bdev, progsize=256)
+vfs.mount(fs, "/")
 sys.path.append("/lib")
 
-del vfs, fs_type, bdev, os, samd, sys
+del fs, fs_type, bdev, vfs, samd, sys
 gc.collect()
 del gc