Subject: Re: Supporting sector size != DEV_BSIZE -- patches
To: Aaro J Koskinen <akoskine@cc.helsinki.fi>
From: Manuel Bouyer <bouyer@antioche.eu.org>
List: tech-kern
Date: 06/03/2002 23:59:44
On Tue, Jun 04, 2002 at 12:53:57AM +0300, Aaro J Koskinen wrote:
> On Mon, 3 Jun 2002, Manuel Bouyer wrote:
> 
> > On Mon, Jun 03, 2002 at 12:49:34PM -0700, Bill Studenmund wrote:
> > > The main locus of the question is what have people been doing so far when
> > > they use non-512-byte sectors? Yes, we have hacks for CDs. But what have
> > > the MO folks been doing? Any MO users who can speak up?
> >
> > Well, all the MO I have have 512-byte blocks. I'm not sure there is
> > that much MO drives with larger block size.
> 
> Check the data sheets of any MO drive! The sector size is media
> specific. E.g. Sony's drives can be used with 512, 1024, 2048 and 4096
> bytes/sector discs. Bigger capacity discs usually have non-512-byte
> sectors. There may be also performance penalty with 512-byte sectors (I
> think 512 bytes/sector is only supported for backwards compatibility
> with legacy systems that do not support other sector sizes, and there's
> some kind of emulation in drives).

Yes, I know there exists. But, although I've seen a number of 512-byte
MO, from various manufacturers, I've never seen a non-512-byte one.
That's why I wonder if there are that much around ...

-- 
Manuel Bouyer <bouyer@antioche.eu.org>
--