[ydl-gen] [YDL5] Install DVD won't boot (bad media?) and related questions

[Derick Centeno]

Hi Jon and other participants on this thread:

I considered what was recommended regarding md5.  I decided to try md5 
as well as cksum with all it's various options (in sequence), and cksum 
from with Terminal.
I downloaded an .iso file from TSS itself, and kept a record of the 
official md5sum defined by TSS.  The expected output would be matched 
against what TSS stated it should be.

Each command was run in sequence with one option.
In EVERY case, each output of these commands produced an output which 
did not match the official TSS value.
I'm sure everyone is aware that each character of the entire sequence of 
the TSS value must match perfectly.
When it does not match perfectly the entire file must be suspect.

Despite this result, perhaps this particular file was garbled during 
download. 

As to downloading and compiling md5sum or other commands which Apple 
removed, this can become a losing battle as with every Apple update  
the  range of changes
they make to Darwin and OS X continues according to their whim.  Since 
they are essentially listening to no one and making choices according to 
their view of what users want -- I don't see a resolution other than to 
abandon OS X as a reliable testing platform.

Jon "NeoAmsterdam" Levy wrote:
>> ...BSD component of OS X which is standard
>> everywhere else (in every other Unix).
>>     
>
> I am well aware that Apple mooches the best bits of BSD as they see  
> fit for Darwin, much as they reworked System V to dovetail with  
> System 7.0.1 in A/UX 3.x (still my favorite UNIX-variant).
>
> With regards to `pdisk`, I was relying on Mac OS X's inability to  
> recognize the partition's format.  That would have indicated the  
> possibility of the DVD being FAT-32, ext2/3, ISO-9660, et al.  Since  
> `pdisk` did not return the expected `No valid block 1 on '/dev/ 
> rdisk2'` error, but rather showed the disc to have an Apple partition  
> map, my interests were piqued.  As it turns out, YDL 4.1's Disc 1 has  
> a similar partition map and uses HFS (standard).
>
> I am no expert in Open Firmware or bootloaders (no matter how hard I  
> try to be), but this makes sense: the first disc has(had?) to be  
> bootable on Old World Macs, but discs 2-4 are needed only when a  
> rudimentary Linux is already running.  As a result they are in  
> ISO-9660 and thus lack an Apple partition map.  Indeed, they could  
> have been ext2/ext3.  Had that been the case, I would have installed  
> ext2fsx on Mac OS X and rummaged around the disc for clues.
>
> With regards to MD5, I disagree fully.  I checked my stash of YDL 4.1  
> ISOs against Argonne's and the MD5s match.  Perhaps Apple's `md5`  
> utility has changed somewhere in the past, but I can say with  
> certainty that since 10.2.8 on forward `md5` works "as expected".   
> Please `man md5`.
>
>