diff --git a/bdevice.py b/bdevice.py
index 309982f..8b274c4 100644
--- a/bdevice.py
+++ b/bdevice.py
@@ -61,3 +61,6 @@ class BlockDevice:
             return self._a_bytes >> self._nbits
         if op == 5:  # BP_IOCTL_SEC_SIZE
             return self._block_size
+        if op == 6:  # Erase
+            return 0
+
diff --git a/fram/FRAM.md b/fram/FRAM.md
index 98e02ec..2547866 100644
--- a/fram/FRAM.md
+++ b/fram/FRAM.md
@@ -233,13 +233,7 @@ cp('/flash/main.py','/fram/')
 See `upysh` in [micropython-lib](https://github.com/micropython/micropython-lib.git)
 for other filesystem tools for use at the REPL.
 
-# 6. ESP8266
-
-Currently the ESP8266 does not support concurrent mounting of multiple
-filesystems. Consequently the onboard flash must be unmounted (with
-`uos.umount()`) before the FRAM can be mounted.
-
-# 7. References
+# 6. References
 
 [Adafruit board](http://www.adafruit.com/product/1895)
 [Chip datasheet](https://cdn-learn.adafruit.com/assets/assets/000/043/904/original/MB85RC256V-DS501-00017-3v0-E.pdf?1500009796)
diff --git a/i2c/I2C.md b/i2c/I2C.md
index e2a2709..bbc5be0 100644
--- a/i2c/I2C.md
+++ b/i2c/I2C.md
@@ -265,9 +265,3 @@ cp('/flash/main.py','/eeprom/')
 
 See `upysh` in [micropython-lib](https://github.com/micropython/micropython-lib.git)
 for other filesystem tools for use at the REPL.
-
-# 6. ESP8266
-
-Currently the ESP8266 does not support concurrent mounting of multiple
-filesystems. Consequently the onboard flash must be unmounted (with
-`uos.umount()`) before the EEPROM can be mounted.
diff --git a/spi/SPI.md b/spi/SPI.md
index 3f6bfdf..b537e94 100644
--- a/spi/SPI.md
+++ b/spi/SPI.md
@@ -259,9 +259,3 @@ cp('/flash/main.py','/eeprom/')
 
 See `upysh` in [micropython-lib](https://github.com/micropython/micropython-lib.git)
 for other filesystem tools for use at the REPL.
-
-# 6. ESP8266
-
-Currently the ESP8266 does not support concurrent mounting of multiple
-filesystems. Consequently the onboard flash must be unmounted (with
-`uos.umount()`) before the EEPROM can be mounted.