install/52399: NetBSD install USB does not boot

[tavmem%gmail.com@localhost]

>Number:         52399
>Category:       install
>Synopsis:       NetBSD install USB does not boot
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    install-manager
>State:          open
>Class:          support
>Submitter-Id:   net
>Arrival-Date:   Thu Jul 13 14:30:01 +0000 2017
>Originator:     Tom Szczesny
>Release:        NetBSD-7.1-amd64-install.img
>Organization:
retired
>Environment:
Linux new-host-4 4.8.6-300.fc25.x86_64 #1 SMP Tue Nov 1 12:36:38 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
>Description:
Have unzipped img:
[tom@new-host-4 netbsd]$ ls
NetBSD-7.1-amd64-install.img

Successfully copied to USB:
[tom@new-host-4 netbsd]$ sudo dd if=NetBSD-7.1-amd64-install.img of=/dev/sdb1 bs=32k

Using Dell Inspiron 13 (7000 Series)
Dell bios recognizes only 2 boot options:  Fedora and Windows

Fedora disk utility reports:
Model:  General USB Flash Disk (0100)
Partitioning:  Master Boot Record
Device:  /dev/sdb1
Partition Type:  0xa9 (Bootable)
Contents:  Unknown
>How-To-Repeat:
You would probably need to try this on a Dell Inspiron 13 (7000 Series)
>Fix: