Re: install/53531: The ISO files you have for download are bad. They have a megabyte of zeros on the front.

[Dave Huang <khym%azeotrope.org@localhost>]

The following reply was made to PR install/53531; it has been noted by GNATS.

From: Dave Huang <khym%azeotrope.org@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: netbsd-bugs%netbsd.org@localhost
Subject: Re: install/53531: The ISO files you have for download are bad. They
 have a megabyte of zeros on the front.
Date: Thu, 16 Aug 2018 15:31:36 -0500 (CDT)

 On Thu, 16 Aug 2018, richard.rodman%gmail.com@localhost wrote:
 >> How-To-Repeat:
 > click on the ISO link. The file downloads pretty fast, which is good, and the size matches (around 700MB), but the file is unusable because it has a megabyte (or more) of zeros on the front of it.
 
 You don't mention which ISO link you're talking about; there are many on 
 NetBSD.org... but I tried 
 https://cdn.netbsd.org/pub/NetBSD/NetBSD-8.0/images/NetBSD-8.0-amd64.iso 
 and 
 https://cdn.netbsd.org/pub/NetBSD/NetBSD-8.0/images/NetBSD-8.0-i386.iso 
 and both look fine to me.
 
 >> Description:
 > Download files on this site are not usable .ISO files. They have a megabyte of zeros on the front (use od -x blah.iso | more).
 
 Keep in mind that od -x shows the byte offset in octal, not hexadecimal.
 I ran "od -x NetBSD-8.0-i386.iso" and got:
 
 0000000 0000 0000 0000 0000 0000 0000 0000 0000
 *
 0100000 4301 3044 3130 0001 654e 4274 4453 2020
 0100020 2020 2020 2020 2020 2020 2020 2020 2020
 ...
 
 the 0100000 means there are 32K of zeroes at the front, not a megabyte.
 And that's normal and correct for an ISO (it's the "system area", which
 is unused in ISO 9660; it may have other stuff on a hybrid CD, like a
 MacOS partition map).
 
 In any case, https://ftp.netbsd.org/pub/NetBSD/security/hashes/NetBSD-8.0_hashes.asc
 has hashes of all the ISOs. Check that your download matches.
 and SHA512 checksums of the ISO files (