[Coco] Another RBFMAN Question

[Darren A.]

Thanks Gene,

I wasn't really concerned about the wasted sector. I just needed to confirm 
how things worked. The example I gave was just for conceptual purposes.

Darren

--

>
>On Tuesday 12 June 2007, Darren A. wrote:
> >Does anyone know if the sectors/clusters containing the ID Sector and
> >Allocation Map on an RBF disk are included in the Allocation Map?
> >
>Yes they are included.
>
> >If so, on a disk with more than one sector-per-cluster, is everything 
>else
> >excluded from the cluster(s) containing LSN 0 and the Allocation Map?
>
>Yes AFAIK.
>
> >For
> >example, if there are 4 sectors-per-cluster, and the Allocation Map 
>occupies
> >sectors 1 and 2, is sector 3 wasted?
>
>Yes.  But look at it this way, if the drive is big enough to need 4 sector
>clusters, (that is over half a gig right there) then one can afford to 
>waste
>a sector, or even 3 in this case, without worrying about running out of 
>disk.
>Besides that, your example is a bit unreal.  If the disk needed 4 sector
>clusters, the allocation map, which cannot exceed 65535 bytes total or 256
>sectors, is going to be at least half that in physical sector count, or 
>over
>32768 bytes.  At 256 bytes per sector, that will be a minimum of 128 
>sectors
>just for the allocation map.  That's 32+ clusters, so you aren't going to 
>be
>worried about sector 3 at all.   OTOH, since lsn0 is included in the same
>allocation as the start of the allocation bitmap, sectors 130-131 could be
>wasted under the right conditions. :)
>
> >Thanks,
> >Darren
> >
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>
>
>--
>Cheers, Gene
>"There are four boxes to be used in defense of liberty:
>  soap, ballot, jury, and ammo. Please use in that order."
>-Ed Howdershelt (Author)
>Reality is just a convenient measure of complexity.
>		-- Alvy Ray Smith
>
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