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Disk cleanup integrity

I have windows 7 professional 64 bit and ran Windows disk clean-up to see how much disk space I could free up.
I was surprised that windows 7 reported that it could free up 326 GB of disk space by removing temporary files alone (not temporary internet files).
Exactly what doe disk clean-up consider to be temporary files and is there any possibility that performing this clean-up could introduce any problems or loss of meaningful data ?
The disk is a solid state 939 GB disk formatted with NTFS and currently has 640GB of used space.
I have made a restore point but I imagine restoration wouldn't reverse the disk clean-up ?

ASKER CERTIFIED SOLUTION

John

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bbao

performing this clean-up could introduce any problems or loss of meaningful data ?

NO.

I imagine restoration wouldn't reverse the disk clean-up ?

CORRECT.

nobus

if a disk cleanup causes loss of data, i'm sure MS would have lots of mails and Phone calls....

SOLUTION

Qlemo

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nobus

you can use windirstat to check what's taking the space : https://windirstat.net/

Roger Alcindor

ASKER

I checked the temporary files folders and couldn't account for the large amount of space reported by disk Clean-up. I proceeded with the clean-up and only about 40 GB had been recovered.
This was the first time that I had used disk clean-up.
thanks for your comments.

John

Thanks for the update and I was happy to help