[Coco] Another RBFMAN Question
gene.heskett at verizon.net
Wed Jun 13 00:19:03 EDT 2007
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?
>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. :)
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