diff --git a/cmd/bootdisk.md b/cmd/bootdisk.md
new file mode 100644
index 0000000..21100dc
--- /dev/null
+++ b/cmd/bootdisk.md
@@ -0,0 +1,11 @@
+# create a bootable disk
+1. sudo fdisk -l
+```
+Disk /dev/sdc: 58,98 GiB, 63333990400 bytes, 123699200 sectors
+Disk model: Flash Disk      
+Units: sectors of 1 * 512 = 512 bytes
+Sector size (logical/physical): 512 bytes / 512 bytes
+I/O size (minimum/optimal): 512 bytes / 512 bytes
+Disklabel type: gpt
+Disk identifier: F...
+```