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Why does Windows delete thumbnails all the time?! Help me please :(

I have a 6TB HDD with tons of media files, pictures and videos, recoded gameplay, GoPro, etc. There are about 5000 files in total and when I installed Windows 10 I had to manually generate the thumbnails by slowly scrolling down. For like 2 months it was all working well, I had my thumbnails even after restarting PC several times throughout the day. But now for some effin reason, literally all the thumbnails are gone. Like wtf? Why the eff does it delete my thumbnails without consent? This is beyond annoying. What's more annoying is the fact that I don't know how to get around this. Can you guys please tell me why Windows enjoys effing with me? Why does Windows 10 delete my thumbnails for no apparent reason? 

I have more than 65% of storage space available on every single drive that's installed so that can't be the reason. 

 

Any help would be appreciated. 

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Did you do a disk cleanup at some point (or have it scheduled to run automatically)?

F@H
Desktop: i7-5960X 4.4GHz, Noctua NH-D14, ASUS Rampage V, 32GB, RTX3080, 2TB NVMe SSD, 2x16TB HDD RAID0, Corsair HX1200, Thermaltake Overseer RX1, Samsung 4K curved 49" TV, 23" secondary

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Dell XPS 2 in 1 2019, 32GB, 1TB, 4K

 

GPD Win 2

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I don't know for sure, but my guess is that the thumbnails are generated as you scroll through the folder, and they're not actually "deleted" per se, but stored in RAM or a cache and then disappear each time you restart the PC.

Desktop - i5-9600KF @4.8GHz all core, MSI Z390-A PRO, 2x8GB Corsair Vengeance 3000MHz, MSI GTX 1660S OC 6GB, WD Blue 500GB M.2 SSD, Seagate Barracuda 2TB 7200RPM HDD

Laptop - ASUS ZenBook 14 with ScreenPad, i7-1165G7, Xe iGPU 96EU, 16GB Octa-Channel 4200MHz, MX450 2GB, 512GB SSD with 32GB Optane

 

Old Laptop 1 - HP Pavilion 15, A10-9600P, R5 iGPU, 8GB, R8 M445DX, 2TB HDD

Old Laptop 2 - HP Pavilion 15 TouchSmart, i3-3217U, Intel HD 4000, 4GB, 1TB HDD

 

iPad 2018 - 128GB

iPhone XR - 128GB

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• Samsung 970 EVO Plus 1TB • Crucial MX500 2TB • Crucial MX300 1.05TB • 

• Corsair HXi 1200W 80-PLUS Platinum • 

( Full PC-setup such as CPU/GPU undervolt settings, monitors, peripherals, external HDD storage, audio equipment etc. can be found in the "System"-section of my PROFILEPAGE )

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-> Moved to Windows

^^^^ That's my post ^^^^
<-- This is me --- That's your scrollbar -->
vvvv Who's there? vvvv

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5 hours ago, Kilrah said:

Did you do a disk cleanup at some point (or have it scheduled to run automatically)?

No, never done that and I'm not sure if it's scheduled. I don't know where to check it.

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