"offline" media check of install DVD?

[Charles Curley]

On Tue, Jan 02, 2007 at 01:17:24PM +1100, Danny Yee wrote:
> Peter Gordon wrote:
> > Each ISOs directory contains a file called SHA1SUM that contains the
> > SHA-1 hashes of the images. You can use a tool called sha1sum to
> > calculate this hash from the image and compare it to the content of the
> > SHA1SUM file.
>  
> I wanted to check the burn, not the download.  But your message gave
> me half what I wanted.
> 
> I ended up doing the following
> 
> * looked at how big the iso image was and divided that by 512 to get
>   the number of blocks in it
> * dd if=/dev/dvd of=check.iso count=blocks
> * sha1sum check.iso
> * compared that with the SHA1SUM file

"sha1sum /dev/dvd" would have saved you a step. In Unix or Linux,
everything is a file. Everything.

Of course, if the downloaded image is broken, it (and any DVDs) are
useless, so the first step is to check the image:

sha1sum -c SHA1SUM

(assuming you have the SHA1SUM file handy.)

-- 

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