Solved Windows 7 Pro on SSD showing wrong disc usage information

April 9, 2014 at 02:24:46
Specs: Windows 7, 32 GB
I have Windows 7 Professional on an SSD.

In the drive listing (i.e. after double-clicking Computer), my o/s drive shows that 113 GB has been used.

However, when I get properties for all the folders (including hidden/system folders), it only adds up to 59 GB.

What is the extra data, please?

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April 9, 2014 at 02:33:45
What are you adding, the individual file sizes or the actual space used on the disk which can be different. The file system used can have an effect. FAT32 is worse for this than NTFS although NTFS can be just as bad if you have a lot of very small files.

If you are using NTFS there is the System Volume Information folder which you cannot know the contents offf. Then there is the recycle bin, did you take that into account. I take it you also counted pagefile.sys and hiberfile.sys if it is in use.


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April 9, 2014 at 02:43:24
Try running the Free Disk Usage Analyser on your SSD. It's on this page, third from the top:

It will take account of stuff that Windows Explorer isn't showing. You won't get a true disk usage figure just by adding up the folders you can see.

message edited by phil22

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April 9, 2014 at 19:57:53
✔ Best Answer
To add to what's already been said, this may help:

For example on an NTFS partition with 4 KB clusters a 6 KB file uses 1.5 clusters but the half sector left over is 'owned' by that file and can't be used by another. So the disk space that file occupies is 8 KB even though the file size is 6 KB. That additional space not used by the file is usually called 'slack space'.

In addition to slack space some of the difference you're seeing between disk space and file space may be due to hidden and system files that aren't being shown.

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Related Solutions

April 9, 2014 at 21:04:23
Also read the first few of these:
to get some important tips on your SSD drive

You have to be a little bit crazy to keep you from going insane.

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April 10, 2014 at 02:24:32
Thank you all for your kind and helpful replies. I'm away from the affected computer for a few days - Mother (90) is very ill and I am at her house - so cannot try your suggestions, just yet. I will do so next week. Thank you again. :)

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