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I haven't checked this recently, but years ago, when I was searching for something in MSDN, the search engine never returned anything relevant to my question. Switch to Google, ask the same question, and it would instantly return the correct document in MSDN! Is this still the case, or have they learned how to perform a search since then?
I like to keep my systems drive neat and uncluttered, partly because I take an image of the drive from time to time as a backup. (I don't use System Restore.) In order to achieve this:
1. I keep my data on a separate internal drive (D:\).
2. I redirect temporary files to a folder on the data drive.
3. I don't use System Restore. It is not 100% reliable and the shadow copies take too much space.
4. Hibernation is turned off. In my case it is unnecessary and takes up too much disk space.
5. I run Ccleaner on a daily basis to get rid of cookies and other junk left behind by Edge.
6. I run Disk Cleanup regularly on the systems drive.
7. Whenever there is an update on Windows, I get rid of the files from the previous version on the systems drive.
I like to do a new clean install of Windows and all apps about once a year. I did one three days ago. I cleaned the systems disk, repartitioned it and installed Windows 10 version 1909 - the same version that was running just before the clean install. I installed the exact same applications that I had running previously. When all was done and everything restored to the same state as previously, the systems drive had 24 GB more free space than it did before the clean install.
I have noticed before that disk space is slowly eroded over time for no apparent reason. What is eating the free disk space?
Leprechauns. Since Millennials never look up from their mobiles, no-one is chasing rainbows to get their pots of gold - so they have been retrained as byte eaters. Individually they don't eat much, but as the breed inside your SSD the group consumes more and more. Think yourself lucky you don't have Banshees - they eat used space as well as free.
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
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Then there is the Temporary Internet Files Cache - Browser Specific location
Noticed browsers (all of them) have more then 1 cache, some that don't clean even if you set the "clear cache on exit" option(s) - and yes, a lot of old & redundant crap therein.
not forgetting winduds has a system TEMP and user TEMP, as well as a few more caches hidden in AppData and ProgramData, every single problem report (sent or not), old windud updates, latest updates, a bunch of other installers that never seem to be purged, log files kept forever, ...
stuff hidden everywhere (wasn't AppData/ProgramData meant to be for settings, not caches, logs and run-time data?)
a lot of those folders I junction/link to the TEMP - makes cleaning up easy.
(even better on linux etc, link those directories to /tmp - auto purged every reboot.)