For both of these calculations, you need to use the sector count that
is allocated to clusters.
* Data Area: 30016 - 61432496
** Cluster Area: 30016 - 61432479
*** Root Directory: 30016 - 30047
** Non-clustered: 61432480 - 61432496
There are 17 sectors at the end of the Data Area that are not allocated
to a cluster and therefore they are not used in the calculation. So,
use 61432479 instead of 61432496.
brian
On Jul 25, 2005, at 4:39 PM, youcef bichbiche wrote:
> Hi,
> does anyone know how the values shown in fsstat are
> computed for the meta-data range and the content
> cluster range?
>
> if I take the example shown in the informer #18, we
> have a FAT32 file system with with sectors ranging
> from 0-61432496. the data area start at 30016 sector.
>
> according to my understanding the meta-data would be:
> 61432496-30016 = 61402480 addreesable sectors
> each sector can hold 16 meta-data entry (i.e. 512/32)
> so the addressable mata-data range is: 61402480*16
> which gives me: 982439680. because TSK assumes that
> the meta-data range doesnt start from 0 but from 3
> then the result will be 982439683 which different from
> the value given in the informer which is 982439426.
>
> the same thing for the cluster range:
> 61432496-30016 = 61402480
> 61402480/32 = 1918827.5
> why it's being rounded to 1818828 and not 1918827?
>
> My last question is just a recommnedation for this
> wonderful tool. I really think that directory entry
> which contains long file name should show the sequence
> number and the checksum. this will ensure that the
> long file name and short name match up and can help to
> detect hiding data by using unconnected long file name
> entries.
>
> regards
>
> youcef
>
>
>
>
>
>
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