[ydl-gen] [YDL5] Install DVD won't boot (bad media?) and related questions
Derick Centeno
aguilarojo at verizon.net
Fri Apr 13 08:25:39 MDT 2007
Dear Gavin:
Similar function yes, but not precise or exact in tune with what the
standard md5sum sequence generates.
Try it; any of those available in Tiger or Panther. See for yourself.
An earlier version of Panther did, at one time, within the Terminal use
and contain the md5sum algorithm. I know because I used it and
recommended it's use back then; but Apple chose to remove even that from
Terminal. That leaves OS X users with nothing to verify a standard
Linux .iso or other download using the standard md5sum algorithm.
There is no way to compare standard md5sum output reported in Unix/Linux
packages with the variants Apple uses.
For the the numbers generated by these variants to be meaningful to
users, vendors would have to use the same variants at their end when
their packages are created.
Then and only then would the Apple algorithm variant be useful as a
comparison.
But why go through choosing a commercial and proprietary (Apple) variant
when there exists the still current and useful open source standard?
Apple is free to do what and as it wishes... however in this situation,
it's a completely useless choice to those who use Linux.
There may be open source BSD variants of what Apple uses; however again
vendors creating Linux packages would have to use them. Most don't;
md5sum is what is used. Again Apple is following it's own way which has
nothing to do with Linux.
------------------------------------------------------------------------
Gavin Hemphill wrote:
> 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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