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Solve : Disk occupancy?

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I have two hard discs in my PC. one 20GB and the other 200GB. The 20GB capacity Disc is ‘C’ and  is TOTALLY devoted to Windows XP Professional and all installed programs.  

According to Windows Explorer, ‘C’ has 11.30GB used SPACE and 7.28GB free space for a total of 18.58GB useful space.

According to Windows Explorer too, total occupancy of all programs installed in ‘C’ accounts for 7.101GB.

So WHAT IS THE DIFFERENCE OF 4.199GB DEVOTED TO?
Why do I not have this space available?

I checked my daughter'S PC (one hard disc only) and there is a discrepancy too.It's devoted to some of your hidden system files.

Everybody's devoted. Quote

I have two hard discs in my PC. one 20GB and the other 200GB. The 20GB capacity Disc is ‘C’ and  is totally devoted to Windows XP Professional and all installed programs.  

According to Windows Explorer, ‘C’ has 11.30 GB used space and 7.28 GB free space for a total of 18.58 GB useful space.

According to Windows Explorer too, total occupancy of all programs installed in ‘C’ accounts for 7.101 GB.

So what is the difference of 4.199 GB devoted to?

Why do I not have this space available?

I checked my daughter's PC (one hard disc only) and there is a discrepancy too.


First of all there is a difference between the manufacturer's Metric sizing and the binary size after formatting.

The 20 GB drive is actually 18.6264514923 GB (18·63 GB) giving an initial 'difference' of 1.37 GB

11·30 + 7·28 = 18·58 , and , 20 - 18·58 = 1·42

System Restore hidden files probably.

The 200 GB drive will be 186.26 GB binary.The industry standard for 1GB is 1024MB.
Some manufacturers use a shortened specification of 1000MB so you would lose a chunk of size.

Also your hard drive is 200GB from new, but when you format it you use a portion of the space for the Master Boot Record, Drive Mapping and recording of where the data is stored. A bit like an indices of where your data is when you save it.

If you take a floppy 3.5". From the factory it is 2.12..ish MB but when formatted for use it's 1.44MB.

Your hard drive is larger and so loses, in relation to it's size, that same amount of space.Yes, my calculations are based on an available of 18.58GB for the "supposed" 20GB Disk 'C'.

Before making those calculations I selected the option for displaying ALLfiles INCLUDING the hidden ones and I added up all them.

It's for me hard to believe that could be Sytem Restore hidden files TAKING over 4.2GB of useful space.

If this were the case, is it possible to move them to other disk or to delete at least some of them?What are the makes and models, or are they both the same? It might have a hidden recovery partition.

Is the difference the same at 4.2 GB ?


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