[wplug] using dd to get 1474560 bytes

[Gentgeen]

That did not do it for me.  I accidentally posted this same email to the K12LTSP list, and one of their replies confermes what I was originally thinking, that something was wrong with the script.  The other reply was --

[SNIP]
Looks to me like the mbcd script is using the wrong tool. The results
of du -b will vary depending on the kind of filesystem on which the 
file resides. On a fat filesystem du reports a floppy image as 1474560
while on ext3 it's 1478656.

-- 
	Mike Wescott
[/SNIP]

On Sun, 11 Jul 2004 11:43:02 -0400
"Poyner, Brandon" <bpoyner at ccac.edu> wrote:

> Give this a try, I'm not certain it will help but it forces dd to not truncate the output file.  
>  
> dd if=/dev/fd0 of=floppy.img bs=1024 count=1440 conv=notrunc
>  
> du -b really prints the apparent size, according to the man page.
>  
>               print apparent sizes,  rather  than  disk  usage;  although  the
>               apparent  size is usually smaller, it may be larger due to holes
>               in ('sparse') files, internal  fragmentation,  indirect  blocks,
>               and the like
> 
> 	-----Original Message----- 
> 	From: Gentgeen [mailto:gentgeen at linuxmail.org] 
> 	Sent: Sat 7/10/2004 10:38 PM 
> 	To: wplug 
> 	Cc: 
> 	Subject: [wplug] using dd to get 1474560 bytes
> 	
> 	
> 
> 	I have a strange problems, I am trying to make a multi-boot CD, using
> 	MBCD.  (This is a script/program found at
> 	http://cowww.epfl.ch/~swalter/mbcd/) It is a really great way for me to
> 	get a number of my own boot floppies onto one CD, and reduce the clutter
> 	in my toolbox. 
> 	
> 	I made an image of a boot floppy using 'dd if=/dev/fd0 of=floppy.img'
> 	and did not see any errors.  when I do a 'ls -l' it shows floppy.img to
> 	be 1474560 bytes.  But when I do a 'du -b' it shows floppy.img to be
> 	1478656 bytes.  Now the mbcd script uses the 'du -b' method to verify
> 	the size of the image, and requires it to be  1474560 or 2949120 bytes.
> 	
> 	So what am I doing wrong?  I tried adding bs=1474560 and bs=2x80x18b to
> 	the 'dd' command, but no change.  I have also tried it with 3 different
> 	boot floppies.
> 	
> 	
> 	
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Associate yourself with men of good quality if you esteem your own 
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