diff --git a/Boot-HermitCore-from-a-raw-image.md b/Boot-HermitCore-from-a-raw-image.md
index a65f954..4dec00e 100644
--- a/Boot-HermitCore-from-a-raw-image.md
+++ b/Boot-HermitCore-from-a-raw-image.md
@@ -1,12 +1,12 @@
 Sometime is it useful to boot HermitCore from a raw image. For instance, [Google Compute Platform](https://cloud.google.com/compute/docs/images/import-existing-image) depends on this image format.
 
-In this tutorial, an image will be created for the application _stream_. At first, we create with `dd` an raw file. A size of 50 Mb (=512 block size * 102400 block) is for `stream` large enough.
+In this tutorial, an image will be created for the application _stream_. At first, we create with `dd` an raw file. A size of 1 Gb is the smallest possible size for the Google Compute Platform and *large* enough.
 
 ```bash
-$ dd if=/dev/zero of=stream.raw bs=512 count=102400
-102400+0 records in
-102400+0 records out
-52428800 bytes (52 MB, 50 MiB) copied, 0.138028 s, 380 MB/s
+$ dd if=/dev/zero of=stream.raw bs=1G count=1
+1+0 records in
+1+0 records out
+1073741824 bytes (1.1 GB, 1.0 GiB) copied, 2.10712 s, 510 MB/s
 ```
 
 Like a normal hard disk, we have to partition the image. The following command create one big partition.