Missing operating system in bootcamp, please help!

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I tried to add more space to drive bootcamp by remove space on mac drive. after that I open bootcamp, it says missing operating system

please help me to get back my bootcamp.

Thank you a lot.
 

Slydude

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M1 MacMini 16 GB - Ventura, iPhone 14 Pro Max, 2015 iMac 16 GB Monterey
I don't have an answer for this just yet. Perhaps it will help if you tell us as much as possible about the steps you performed to do this. The best way to do this would probably have been to do the following:

1. Backup both the Mac and Windows partitions just in case something goes wrong.
2. Use Camptjne X to resize the partitions. http://www.paragon-software.com/home/camptune/

The other option would have been to backup the Bootcamp partition, delete that partition using the BootCamp Assistant, create a larger Windows partition then reload Windows.
if you tried to do this by just deleting the Windows partition using Disk Utility that generally doesn't work. You'll probably have to just start over creating things from scratch.
 
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Silver M1 iMac 512/16/8/8 macOS 11.6
If you tried via Disk Utility and not Camptune as suggested by Moderator slydudeyou may well have killed the partition.
 

chscag

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What you have is a situation that can only be resolved by erasing the entire drive and starting over. Make sure you backup your OS X partition first before doing anything. If you can't get access to your Windows partition (Boot Camp) and have no backup, all your Windows data will be lost.

Whenever you have a dual boot using Boot Camp, you can not re-size the partitions without using special software. As moderator Slydude indicated, only CampTune can re-size a Boot Camp partition without loss of data. Some folks also use WinClone to copy the Windows partition first, but that too will require a re-install. Sorry, but I don't know of any other way to resolve your problem.
 
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Yes you do. Erase and format the drive, re-install OS X and then use BootCamp for Windows as before. CampTune is the only option for what you did and cheap at $20.00.
 

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