Aha!
I finally found why I couldn't use the iso9660 image on an usb stick.
Fix:
diff --git a/gnu/build/file-systems.scm b/gnu/build/file-systems.scm
index b6930497d..7f2c5dcb0 100644
--- a/gnu/build/file-systems.scm
+++ b/gnu/build/file-systems.scm
@@ -398,7 +398,7 @@ not valid header was found."
(match (string-tokenize line)
(((= string->number major) (= string->number minor)
blocks name)
- (if (partition? name major minor)
+ (if #t ;(partition? name major minor)
(loop (cons name parts))
(loop parts))))))))))
Then it works fine on CD, on USB stick, whereever.
Is there a reason why (disk-partitions) second-guesses the Linux kernel and
filters out some entries from /proc/partitions ?
