USB img NetBSD-7.0.1-amd64-install.img does not boot

[Matthias Apitz <guru%unixarea.de@localhost>]

Hello,

I'm a long time user of FreeBSD (since 1995) and run CURRENT on my
laptops and netbooks, all compiled from SVN. I only say this to
underline that I have certain experience with such stuff.

I wanted to give NetBSD a try on my Acer C720 (aka Chromebook, but
switched to LegacyBoot mode) and fetched the USB image. I wrote it with
dd(1) to the USB key and it is there and even mountable in FreeBSD:

# fdisk da0

******* Working on device /dev/da0 *******
parameters extracted from in-core disklabel are:
cylinders=961 heads=64 sectors/track=32 (2048 blks/cyl)

parameters to be used for BIOS calculations are:
cylinders=961 heads=64 sectors/track=32 (2048 blks/cyl)

Media sector size is 512
Warning: BIOS sector numbering starts with sector 1
Information from DOS bootblock is:
The data for partition 1 is:
sysid 169 (0xa9),(NetBSD)
    start 2048, size 1124352 (549 Meg), flag 80 (active)
	beg: cyl 0/ head 32/ sector 33;
	end: cyl 70/ head 29/ sector 23
The data for partition 2 is:
<UNUSED>
The data for partition 3 is:
<UNUSED>
The data for partition 4 is:
<UNUSED>


$ ls /mnt

altroot
amd64
bin
boot
boot.cfg
dev
etc
install.sh
...


but it does not boot:

Booting from Hard Disk ...
NetBSD MBR boot
Error Disk read error
Booting from Floppy....
Boot failed: could not read the boot disk

No bootable device.

What could I have done wrong? Thanks

Vy 73

         matthias

-- 
Matthias Apitz, ✉ guru%unixarea.de@localhost, ⌂ http://www.unixarea.de/  ☎ +49-176-38902045
"Wer übersieht, dass wir uns den anderen weggenommen haben und sie uns wiederhaben wollen,
kann von den Kämpfen der letzten Tage keinen verstehen. Und kann natürlich auch keinen
dieser Kämpfe bestehen." Hermann Kant in jW 1.10.1989