Subject: Re: dd from raw devices
To: Peter Seebach <>
From: Bill Studenmund <>
List: current-users
Date: 05/24/2000 15:29:04
On Wed, 24 May 2000, Peter Seebach wrote:

> So, I was looking at a NetBSD 1.4.2 CD, and I noticed that it claims to have
> ~110,000 sectors in cd0a, which is about right if they're 512-byte sectors,
> but it also claims to have 2048-byte sectors.  The end result is that I can
> 'dd' at least a full gigabyte off of a ~550-580MB CD-ROM.

What is doing this claiming?

> Feature?  Bug?  I certainly found it surprising.  I was using bs=2k, I'm not
> sure if that's relevant.  (Hmm.  Nope, same problem using bs=512)

No, that just means that dd will read and write bs bytes at a time.

Take care,