diff --git a/shared-module/storage/__init__.c b/shared-module/storage/__init__.c
index aa3bcc6867..5864307fd5 100644
--- a/shared-module/storage/__init__.c
+++ b/shared-module/storage/__init__.c
@@ -30,6 +30,7 @@
 
 #include "extmod/vfs.h"
 #include "py/mperrno.h"
+#include "py/mphal.h"
 #include "py/obj.h"
 #include "py/runtime.h"
 #include "shared-bindings/microcontroller/__init__.h"
@@ -159,6 +160,8 @@ void common_hal_storage_remount(const char *mount_path, bool readonly, bool disa
 }
 
 void common_hal_storage_erase_filesystem(void) {
+    usb_disconnect();
+    mp_hal_delay_ms(1000);
     filesystem_init(false, true); // Force a re-format.
     common_hal_mcu_reset();
     // We won't actually get here, since we're resetting.
diff --git a/supervisor/shared/usb/usb.c b/supervisor/shared/usb/usb.c
index 36b5ec05d6..e8541669ad 100644
--- a/supervisor/shared/usb/usb.c
+++ b/supervisor/shared/usb/usb.c
@@ -74,6 +74,10 @@ void usb_init(void) {
 #endif
 }
 
+void usb_disconnect(void) {
+    tud_disconnect();
+}
+
 void usb_background(void) {
     if (usb_enabled()) {
         #if CFG_TUSB_OS == OPT_OS_NONE
diff --git a/supervisor/usb.h b/supervisor/usb.h
index 2a447c3686..0dead3e265 100644
--- a/supervisor/usb.h
+++ b/supervisor/usb.h
@@ -45,6 +45,7 @@ void init_usb_hardware(void);
 // Shared implementation.
 bool usb_enabled(void);
 void usb_init(void);
+void usb_disconnect(void);
 
 // Propagate plug/unplug events to the MSC logic.
 void usb_msc_mount(void);