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Re: dd on CDROM?

On Wed, Oct 31, 2001 at 10:55:41AM +0000, Peter Fairbrother wrote:
> Is there some way to read blocks on a cdrom, eg using dd if=/dev/cd0a etc,
> without unmounting the CD?
> 
> I want to read numbered blocks, but as the CD has dd (and root, no HDD) on
> it I can't easily unmount it. Using dd if=/cdrom doesn't work (NetBSD reads
> the first 2k), and if I use dd if=/dev/cd0a when mounted I get "device
> busy".

I think your 2k problem is you need a bs=32k in your dd command.  Don't know
about the rest, though.

-Dan

-- 
"Burnished gallows set with red
 Caress the fevered, empty mind
 Of man who hangs bloodied and blind
 To reach for wisdom, not for bread."  -- Deoridhe Grimsdaughter