otherwise people will think you can just detach it.

howto/ganeti.md

@@ -727,11 +727,16 @@ never do that.
 
 See also the [upstream procedure](https://docs.ganeti.org/docs/ganeti/3.0/html/admin.html#conversion-of-an-instance-s-disk-type) and [design document](https://docs.ganeti.org/docs/ganeti/3.0/html/design-disk-conversion.html).
 
-### Detaching a disk
+### Removing or detaching a disk
 
-If you need to remove a volume from an instance without destroying data, it's
-possible to detach it. First, you must identify the disk's uuid using
-`gnt-instance info`, then:
+If you need to destroy a volume from an instance, you can use the
+`remove` flag to the `gnt-instance modify` command. First, you must
+identify the disk's uuid using `gnt-instance info`, then:
+
+    gnt-instance modify --disk <uuid>:remove test-01
+
+But maybe you just want to detach the disk without destroying data,
+it's possible to detach it. For this, use the `detach` keyword:
 
     gnt-instance modify --disk <uuid>:detach test-01