Subject: Re: 2048 bytes/sector devices? (DVD RAMs, Fujitsu MO's, etc)
To: Ignatios Souvatzis <is@netbsd.org>
From: Reinoud Zandijk <reinoud@netbsd.org>
List: tech-kern
Date: 06/30/2005 19:05:03
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On Wed, Jun 29, 2005 at 08:49:26PM +0100, David Laight wrote:
> On Tue, Jun 28, 2005 at 11:40:28AM +0200, Ignatios Souvatzis wrote:
> > On Mon, Jun 27, 2005 at 02:26:55PM -0700, Tom Nakamura wrote:
> > The problem isn't _reading the devices_, it's interaction of the filesystem
> > with the underlying block size.
> 
> And working out what numbers to put in a disklabel/mbr.
> Do you know what the mbe extended partition chain looks like with 2k sectors?
> 
> CDROM/DVD tend to use their own special filesystem types which are designed
> for 2k sector sizes.

ISO9660 is designed for 2k sectors and its sucessor UDF is specified and 
designed to allow every multiple of 512 bytes including say 1536 or 2560 
but also 19456 bytes/sector; it might even be persuaded to work for 
everyting >= 512 bytes/sector.

Cheers,
Reinoud

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