[ltp] Re: Bootable CD

[Richard Neill]

If your system will boot from another CD, but not from the Mandrake ISO, 
then the chances are that you have a problem with the disc.

1)check the downloaded .iso file:
	md5sum mandrake_download_9.1rc2_discX.iso
    and compare the result to the md5sum on the Mandrake web page

2)test your disc:
	dd if=/dev/cdrom of=temporary_file.iso
    then
	md5sum temporary_file.iso

If the md5sum is wrong, you have a coaster! The read from disc, md5sum 
process may take 15 minutes.

Most of the time, you can just do:
	cat /dev/cdrom | md5sum
But for some reason, which I don't understand, this only gives the right 
answer most of the time, and not always - so you're safer using dd and 
writing to a file.

If your disc md5sum is right, and your BIOS is set correctly, then you 
have probably found a bug in mandrake9.1rc2.

[Have just re-read the man page - I think you can shortcut everything 
with:	'dd if=/dev/cdrom | md5sum'	]


Richard







Frank Roberts - SOTL wrote:
> Thanks Richard
> 
> If can not make bootable CD but must make bootable images then it probabely 
> would be prudent to ask the real question.
> 
> I downloaded Mandrake 9.1rc2 and then proceded to copy it to disk by use of 
> the previously mentiones command and by XCDRoast.
> 
> In short it will not boot the box to start installation; Md 9.0 which I have 
> as a commerical box set does.
> 
> Assumming that the download is perfect - it was done over a line that is 
> better than a T3 - does anyone have any thoughts on what is going wrong.
> 
> Thanks
> Frank
> 
> On Wednesday 19 March 2003 18:53, Richard Neill wrote:
> 
>>You don't make a "bootable CD", you make a "bootable iso image"
>>and then record that to cd.
>>
>>'man mkisofs' will help.
>>
>>Sorry that's rather brief - I can't remember how to actually do it. Hope
>>it's slightly useful anyway.
>>
>>Richard
> 
> 
> On Wednesday 19 March 2003 18:51, Frank Roberts - SOTL wrote:
> 
>>>One can copy a CD image from HD to CD by:
>>>cdrecord -dev=0,2,0 -speed=12 -data <file name>.iso
>>>for a data iso on my Thinkpad
>>>
>>>One can likewise make a bootable floppie by:
>>>dd if=/dev/fd0 of=boot.img bs=8192
>>>
>>>So, how soes one make a bootable CD?
>>>cdrecord -dev=0,2,0 -speed=12 boot.img <file name>.iso
>>>
>>>I know well at least I think boot.img has to be in there somewhere.  So
>>>how does one do this?
>>>
>>>Thanks
>>>Frank
> 
>