Windows 10 under Bootcamp. Hard drive full.

[Dawirt]

Sorry it's me again.
Installed windows 10 using Boot Camp on my 2020 27 inch retina imac.
Problem is under windows, it's showing up that the hard drive (C: partition) is full.
Can anyone make any sense of the screenshots I'v attached before I format the drive?
Thanks in advance.

 

[Dawirt]

iOS screenshot.

 

[chrfr]

Sorry it's me again.
Installed windows 10 using Boot Camp on my 2020 27 inch retina imac.
Problem is under windows, it's showing up that the hard drive (C: partition) is full.
Can anyone make any sense of the screenshots I'v attached before I format the drive?
Thanks in advance.

If you disable hibernation in Windows you'll get rid of that 71GB hibernation file.

 

[Dawirt]

I have no idea how you knew that but it worked straight away.
THANKS!
What pray tell is windows "hibernation?.

 

[winxmac]

Shut down, sleep, or hibernate your PC
https://support.microsoft.com/en-us...-battery/shut-down-sleep-or-hibernate-your-pc

How to disable and re-enable hibernation on a computer that is running Windows
https://learn.microsoft.com/en-us/t...and-drivers/disable-and-re-enable-hibernation

What's the Difference Between Sleep and Hibernate in Windows?
https://www.howtogeek.com/102897/whats-the-difference-between-sleep-and-hibernate-in-windows/

 

[benholt]

One thing worth tacking on since you'll bump into it next: with hibernation off you cleared hiberfil.sys, but Windows 10 also runs "Fast Startup" by default, which leaves the NTFS journal in a hybrid-hibernated state on shutdown. On a Bootcamp iMac that stops macOS from mounting the Windows partition properly — you'll see it show up read-only or refuse to mount if you try to grab a file from it in Finder.

Turn Fast Startup off in Control Panel > Power Options > Choose what the power buttons do > Change settings that are currently unavailable > uncheck "Turn on fast startup". Windows will then do a clean cold shutdown and the Bootcamp volume is readable from macOS again.

On sizing: hiberfil.sys defaults to about 40% of physical RAM on modern Windows, and a 71GB file usually means either a big RAM config (128GB was an option on that 2020 27") or the "full" hibernation setting. If you ever want it back on a laptop, powercfg /h /size 50 shrinks it to half rather than disabling entirely — no benefit on a desktop iMac, but handy to know.

 

[Dawirt]

On sizing: hiberfil.sys defaults to about 40% of physical RAM on modern Windows, and a 71GB file usually means either a big RAM config (128GB was an option on that 2020 27") or the "full" hibernation setting. If you ever want it back on a laptop, powercfg /h /size 50 shrinks it to half rather than disabling entirely — no benefit on a desktop iMac, but handy to know.

That IS handy to know.
Am still able to transfer files from "C:Bootcamp" with finder.
Thanks for that useful post.

 

[carylee2002]

Here is something I have done to get rid of useless files to freeup you C drive in Windows 10

Under Run usually under option R

1. type Prefetch....then delete out all the files and also click on box that do this for all current files.
2. type temp...repeat delete and click on the box
3. type %temp%...repeat delete and click on the box
4. type cleanmgr....select c drive and then ok. Highlight all boxes to delete and ok
5. type cleanmgr...select c drive and click clean up system files.
then check how much room you have on your C drive. Don't worry..this is getting rid of temp files only.

 

[Dawirt]

1. type Prefetch....then delete out all the files and also click on box that do this for all current files.
2. type temp...repeat delete and click on the box
3. type %temp%...repeat delete and click on the box
4. type cleanmgr....select c drive and then ok. Highlight all boxes to delete and ok
5. type cleanmgr...select c drive and click clean up system files.
then check how much room you have on your C drive. Don't worry..this is getting rid of temp files only.

That gave me an extra 3GB of storage thanks.
Now I have a bit more breathing space.🙂