diff --git a/cmd/bootdisk.md b/cmd/bootdisk.md
index 21100dc..46cbeef 100644
--- a/cmd/bootdisk.md
+++ b/cmd/bootdisk.md
@@ -9,3 +9,15 @@ I/O size (minimum/optimal): 512 bytes / 512 bytes
 Disklabel type: gpt
 Disk identifier: F...
 ```
+```bash
+df
+```
+```
+/dev/sdc1        4914194  4914194         0 100% /media/sander/Ubuntu 22.04.3 LTS amd64
+/dev/sdc4       55718056     1384  52853880   1% /media/sander/writable
+```
+
+```bash
+sudo umount /dev/sdc1
+sudo umount /dev/sdc4
+```