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Filocullen

macrumors newbie
Original poster
Jan 11, 2013
28
0
Hi, I'v installed Windows 10 on my iMac (High Sierra) using Bootcamp. Everything went ok, but when I'm on Windows, Mac disk isn't visibile, it's not on boot camp assistant on control panel, and if I try to reboot on Mac via the bootcamp icon, it says that it cannot find any disk. The only way is to reboot by holding down ALT.
Anyone can help me?Thanks
 

imacken

macrumors 65816
Feb 28, 2010
1,232
127
Correct behaviour. You won’t see your Mac drive from Windows in general, but I’m not sure why you don’t have the option to reboot into it from the Bootcamp panel.
 

Filocullen

macrumors newbie
Original poster
Jan 11, 2013
28
0
but that doesn't happen, I don't have the option to reboot into Mac, neither it's visibile in Bootcamp Control Panel, but when I'm on Mac I can see the Bootcamp partition perfectly. The Windows version I have installed is Windows 10.Home. What do you suggest me to do...?
 

DeltaMac

macrumors G5
Jul 30, 2003
13,606
4,496
Delaware
Is your boot camp software on the PC up to date? Check that by opening your Apple Software Update app while you are booted to Windows. Should automatically scan for updates.

Is your Mac boot drive encrypted (do you have File Vault enabled?)
 

Filocullen

macrumors newbie
Original poster
Jan 11, 2013
28
0
Is your boot camp software on the PC up to date? Check that by opening your Apple Software Update app while you are booted to Windows. Should automatically scan for updates.

Is your Mac boot drive encrypted (do you have File Vault enabled?)

I did it, it wasn't updated, but after the updating it's always the same, and no I don't have File Vault enabled.
I noticed that in disk management my Mac it's shown, I have two partition disks in addiction to bootcamp. It lists Disk 0 Partition 1: 300 MB(System partition EFI, I don't know what it is) and Disk 0 Partition 412 GB (Primary partition), which is the MAC.

I just did the bootcamp, so if I have to to do it again, it's ok!
 

h9826790

macrumors P6
Apr 3, 2014
16,628
8,558
Hong Kong
Hi, I'v installed Windows 10 on my iMac (High Sierra) using Bootcamp. Everything went ok, but when I'm on Windows, Mac disk isn't visibile, it's not on boot camp assistant on control panel, and if I try to reboot on Mac via the bootcamp icon, it says that it cannot find any disk. The only way is to reboot by holding down ALT.
Anyone can help me?Thanks

If your High Sierra partition is APFS, then your Mac's behaviour is normal.

There is no driver in Windows to read APFS yet. Apple didn't update the Bootcamp software to that level. Therefore, the Bootcamp control panel cannot display any APFS boot partition. Same reason, that "reboot back to OSX" won't work either.

Apple recommended work around is to use Boot Manager (hold Alt during boot) to go back to MacOS. But if you a more "software" solution, Bootchamp with SIP disable also work (but you need to keep SIP disabled).

Other work around will be like stay at HFS+ (even with SSD, you can clone the OS to another partition, re-format it back to HFS+, and then clone it back). Or install an extra HFS+ 10.12.6 (or onward) to make bootcamp panel able to boot back to MacOS, and then further choose your APFS High Sierra partition inside that MacOS as the next startup disk. But in general, no one prefer this kind of "work around".
 

Filocullen

macrumors newbie
Original poster
Jan 11, 2013
28
0
Ok, I didn't know this, I'm kinda new to Mac:) How can I check if the High Sierra partition is AFPS...?Thanks
[doublepost=1511098613][/doublepost]HI, nevermind, I just checked the info for Macintosh Hd and it says Format: APFS. So that's the answer:) Thanks for your help, one last thing, what's the System partition EFi of 300MB which is visibile on Windows?And why the Mac isn't showing it?Thanks so much
 

h9826790

macrumors P6
Apr 3, 2014
16,628
8,558
Hong Kong
Ok, I didn't know this, I'm kinda new to Mac:) How can I check if the High Sierra partition is AFPS...?Thanks
[doublepost=1511098613][/doublepost]HI, nevermind, I just checked the info for Macintosh Hd and it says Format: APFS. So that's the answer:) Thanks for your help, one last thing, what's the System partition EFi of 300MB which is visibile on Windows?And why the Mac isn't showing it?Thanks so much

The EFI partiton almost always there on a modern computer, depends on which OS you are using, it can be 100MB, 200MB, or 300MB in size. It basically use to store the files for booting.

For a normal user, my suggestion is don’t even think about to touch it. If you accidentally damage that partition, change the parameter a bit, or alter the file structure. It can kill your OS which may required re-format the hard drive to make a fresh OS installation.

However, if you want to play around with some advance stuff (e.g. install Clover, rEFInd, or other boot loader), most likely you will need to access this EFI partiton.

In fact, that EFI partiton can be shown in MacOS (e.g. in terminal), just not natively show in disk utility. By running some simple command in terminal, you can mount that EFI partiton, and access it via Finder like any other partition.

One of a free simple Mac GUI software call Clover Configuratior can provide easy access of all the EFI partiton.
View attachment 736649
 
Last edited:

ToddTech2002

macrumors newbie
Jan 29, 2019
1
0
If your High Sierra partition is APFS, then your Mac's behaviour is normal.

There is no driver in Windows to read APFS yet. Apple didn't update the Bootcamp software to that level. Therefore, the Bootcamp control panel cannot display any APFS boot partition. Same reason, that "reboot back to OSX" won't work either.

Apple recommended work around is to use Boot Manager (hold Alt during boot) to go back to MacOS. But if you a more "software" solution, Bootchamp with SIP disable also work (but you need to keep SIP disabled).

Other work around will be like stay at HFS+ (even with SSD, you can clone the OS to another partition, re-format it back to HFS+, and then clone it back). Or install an extra HFS+ 10.12.6 (or onward) to make bootcamp panel able to boot back to MacOS, and then further choose your APFS High Sierra partition inside that MacOS as the next startup disk. But in general, no one prefer this kind of "work around".
FINALLY, and answer that MAKES SENSE. Everyone else just shut up now. This is why boot from Mac will not show up. Thank you h9826790! It makes sense and it display WHY it makes sense.
 
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