"Luc Kumps" <NOkumpsS
...@pandora.be> wrote in message
...
> Did you:
> - empty the Recycle Bin
> - empty the cache of your Browser?
> Luc
> "Laurent RAVEL" <lra...@referentiel.com> wrote in message
> news:90qon6$5gj$1@wanadoo.fr...
> > Hi KlausL,
> > > I assume that "Go" stands for "GByte" - true?
> > yes.
> > > It assumes that the drive size is 1 GByte, that you have a FAT
> > partition and that your cluster
> > > size is 16 kBytes (which is the default for drives from 513 - 1023
> > MBytes.)
> > yes.
> > > Disk space = (sum of all file sizes) + 8kBytes*(number of files) +
> > > 8kBytes*(number of folders)
> > > Did you include hidden files in your calculations?
> > Yes
> > I recalculate with your formula and disk space is
> > Disk space = 1 GB - (560 MB + (8Kb * 13447) + (8Kb * 784)+ 2 MB + 20
MB)
> > = 1024 - (560 + (10756/1024) + (6272/1024) + 22
> > = 1024 - 694 = 330 MB
This formula is only an approximation. The problem here is that if file
sizes are 'random', then the _average_ loss because of the cluster size
will be 8K, and the formula will be correct. Unfortunately, while larger
files may meet these requirements, there are a lot of small files, that
have only a few bytes in size, and the waste in these cases will tend to
be nearer to 16K, than 8K. This leads to the 'real' loss being a lot
larger than expected in some cases. A 'shortcut' for instance will have a
size of under 1.5KB, and will allways waste therefore about 14k.
Personally on a Windows system, I'd expect the 'average loss' to be nearer
3/4 the cluster size...
It is also worth remembering that if the partition is even one byte 'over'
1GB, the loss will double.
> > Win Nt says 110 MB, the difference is important : 220 MB for space
> > consumed by long file names and folders with large numbers of files
> > inside.
Cluster sizes are a problem. It is more efficient to use larger clusters,
but costs a lot in storage, especially when there are a lot of small
files. If (for instance) you converted to NTFS, the default cluster chosen
using the 'convert' tool, is only 512bytes, giving relatively tiny losses.
However for users wanting more speed, using a larger cluster size
(especially given the relatively low cost of disk storage), is better.
The difference between the 'real' size, and the size from explorer, is
available by running 'chkdsk'. This will report the allocation unit size
(which gives the important figure for 'max waste - in the formula, 16KB
was assumed, but if you have 32KB, the figures will double...), and the
actual sizes used by the files.
Best Wishes
