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

[Gavin Hemphill]

Derick:
	Apple uses the program md5 rather than md5sum.  Similar functionality.
	G++

On 13-Apr-07, at 7:15 AM, Derick Centeno wrote:

>
>
>> ...I tried to boot the Quad
>> from the DVD without any external devices present.
>>
>> If that had worked, I wouldn't be writing this email.
>>
>> I suspect that I have a bad print of the YDL 5 Install DVD (The
>> sources' DVD mounts properly, though).  I used `pdisk` on OS X to
>> determine the location of the Install DVD, and came across the
>> following:
>>
>> 	Top level command (? for help): L
>> 	pdisk: can't open file '/dev/rdisk1'  (Permission denied)
>> 	pdisk: can't open file '/dev/rdisk0'  (Permission denied)
>> 	
>> 	Partition map (with 512 byte blocks) on '/dev/rdisk2'
>> 	#:                type name    length   base    ( size )
>> 	1: Apple_partition_map Apple        2 @ 1
>> 	2:           Apple_HFS PBOOT  7609424 @ 16      (  3.6G)
>>
>> 	Device block size=512, Number of Blocks=7609440 (3.6G)
>> 	DeviceType=0x1, DeviceId=0x1
>>
>>
> Remember that what Apple has done with open source is modify nearly
> everything to it's taste.  Apple's pdisk for example is probably not
> able to see or read ext3 format which is the format used by YDL.   
> So the
> above doesn't mean anything.  Apple even entirely removed md5sum from
> Darwin, the open source or BSD component of OS X which is standard
> everywhere else (in every other Unix).
>> With the disk number and slice number of YDL's installation
>> partition, I ran `md5 /dev/disk2s2` to verify the checksum.  It
>> returned an `input/output error`.  Even if it had worked, I cannot
>> locate YDL 5's ISO MD5 for Apple Macintosh (the Sony Playstation MD5
>> was easily found at the Argonne National Labs's Yellow Dog mirror).
>>
> As I explained, and this is stated by Apple itself under it's help  
> menu
> -- Apple doesn't use md5sum, it uses another algorithm related to  
> md5sum.
> The bottom line is that all the algorithms Apple uses don't match the
> standard md5sum -- so none of the algorithm variants which Apple now
> uses matter as far as YDL, or any other Linux, and maybe any other  
> Unix,
> is concerned.  None of the variants will produce a sequence ever
> matching a md5sum standard.
>> My intuition tells me that I probably have a bad media.  I hope not
>> because bought the DVD from the YDL store *specifically* because I
>> wanted to avoid having bad burns (I also wanted to go around the
>> office with that nice, big, "I'm on the cutting-edge and you have to
>> wait another two weeks to download the ISO from the mirrors you bunch
>> of freeloaders" smirk).  So, I have a few questions...
>>
>> (1) What is the MD5 correct for the "PBOOT" partition?
>>
>>
> It wouldn't matter if you had the sequence from TSS because currently
> Apple saw fit to remove the standard md5sum algorithm which TSS uses,
> and remains standard as a Unix algorithm universally everywhere except
> in Apple-land.
>> (2) Could the short length of the Apple partition map affect booting
>> from the DVD?
>>
>>
> This has nothing to do with anything, in my view.
>> (3) Are the YDL 5 prints' undersides supposed to be blue?
>>
>>
> Different persons will see different colors or none, depending on  
> their
> eyesight and perhaps even their location.  Although I referred to the
> possibility of the DVDs being Blu-ray, I was really indicating that  
> this
> particular observation is not a useful guide in determining anything.
> Consider this, most persons can see upon reflecting the underside  
> of any
> DVD or CD to light for a short period a range of brightly varying
> colored light similar to a rainbow; people will obviously observe
> different hues and describe them quite differently.
>
> The most useful observation to be concerned about would be, in my  
> view,
> if after burning or having burnt a particular CD or DVD it looked
> exactly like the underside of a blank DVD or CD.  Many more people can
> distinguish that difference; however some cannot.  However in the end,
> isn't reliable either.
>> (4) Is it possible to launch the YDL 5 installer from within YDL 4?
>> (Note: I know the answer will most likely be that I have to boot with
>> YDL 5 to install it, but I'm asking anyway)
>>
> I don't believe that starting from YDL 4 installer and somehow  
> switching
> to YDL 5 is possible.  In my experience, anaconda once started is  
> going
> to expect to run completely through to install that version of YDL.
> Another point is that there are, I believe, variations of anaconda  
> which
> match that version of YDL.
>> (5) Did I just waste $49.95 (plus shipping) on a coaster?  (Note: If
>> so, it'll be used to "coast" my YDL coffee mug)  And...
>>
> Not necessarily.  It depends on considering what you got and what you
> ordered.  It may have been a mix-up, your own or someone else's.
> The good point is at least you're asking.
> If you don't have a PS3, and intended to run YDL 5 on Macs only double
> check to insure that you actually received that version.
>> (6) How can I be absolutely sure that the media is bad, and what can
>> I do about getting a replacement?, and...
>>
>
> Given what I explained above regarding what Apple chose to do  
> regarding
> Darwin and standard Unix commands -- you can't test or do anything  
> with
> OS X as far as engaging in a reliable test.  Re-reading the  
> description
> of when you did, try this:
>
> 1.  make sure that there is a Linux partition on your hard drive
> formatted and prepared for YDL.
> 2.  when the mac powers up then insert the DVD.
> 3.  before the mac runs OS X, then press the C or option key.  On  
> my own
> laptop, I press one of these keys just after boot and hold them down
> until the expected action begins.
>
> Good Luck....
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