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Need Help: I deleted Win10 recovery partition created by BootCamp and can't run ...
 

Need Help: I deleted Win10 recovery partition created by BootCamp and can't run Macintosh HD after that  

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ardsagart
(@ardsagart)
Active Member
Joined: 6 months ago
 

Hello everyone,

please advise what to do! Trying to set up my eGPU I deleted the small partition created by Windows 10 during its installation process via BootCamp. I thought it was a Windows recovery partition. Now when I turn my MacBook on and press the press the Option key the Startup Manager displays only Windows partition to boot from. When I'm running Cmd+R (boot from internet) and then launch Disk Utility it shows that disk0s1 with OS X is turned off and I can't turn it on.

Could you please advise how to restore the access to Macintosh HD partition?

MacBookPro10,1 (Retina, Mid 2012). eGPU: ASUS ROG-STRIX-RX590-8G-GAMING (Sonnet eGFX Breakaway Box)


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ardsagart
(@ardsagart)
Active Member
Joined: 6 months ago
 

I deleted this partition by using diskpart. Maybe there is anyway to repair its actions?

diskpart list partition now shows that there is a kind of displacement with the size 200MB (the size of deleted partition). According to Mac's disk utility there is a disk0s1 partition 140GB which is turned off and 139.39 GB free space - it's the same partition.

This post was modified 2 months ago

MacBookPro10,1 (Retina, Mid 2012). eGPU: ASUS ROG-STRIX-RX590-8G-GAMING (Sonnet eGFX Breakaway Box)


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nu_ninja
(@nu_ninja)
Estimable Member
Joined: 2 years ago
 

I'm not sure I quite understand everything you're saying. Screenshots or pictures of your screen showing the partition table would help.

My best guess would be that you accidentally deleted your ESP (EFI system partition), which has size 200MiB. I think reinstalling macOS would fix this

Mid-2012 13" Macbook Pro (MacBookPro9,2) TB1 -> RX 460/560 (AKiTiO Node/Thunder2)
+ macOS 10.15+Win10 + Linux Mint 19.1


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ardsagart
(@ardsagart)
Active Member
Joined: 6 months ago
 

Yep, I'm attaching the screenshot. Now there is another one partition reserved by Windows (579 MB) - I installed Windows once again.

MacOS reinstall' tool can't access the partition of 140 GB, where it should be. I can only install macOS to the new partition.

 Annotation 2019 09 12 013717

MacBookPro10,1 (Retina, Mid 2012). eGPU: ASUS ROG-STRIX-RX590-8G-GAMING (Sonnet eGFX Breakaway Box)


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joevt
(@joevt)
Prominent Member
Joined: 2 years ago
 

Why would you install Windows if you're trying to get macOS working? If your disk is a hybrid disk (MBR + GPT), then Windows should not be used to do any partitioning. You should use a separate disk with macOS to investigate the current state of your harddisk.

Mac mini (2018), Mac Pro (Early 2008), MacBook Pro (Retina, 15-inch, Mid 2015), GA-Z170X-Gaming 7, Sapphire Pulse Radeon RX 580 8GB GDDR5, Sonnet Echo Express III-D, Trebleet Thunderbolt 3 to NVMe M.2 case


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Eightarmedpet
(@eightarmedpet)
Noble Member
Joined: 3 years ago
 

As @joevt said, your best option may be to instal macOS on a new partition in order to gain access to the files on your previous macOS instal (or do you have a back up?).
Once the files are safe you can nuke the whole disk or the old partition.

2017 13" MacBook Pro Touch Bar
GTX1060 + AKiTiO Thunder3 + Win10
GTX1070 + Sonnet Breakaway Box + Win10
GTX1070 + Razer Core V1 + Win10
Vega 56 + Razer Core V1 + macOS + Win10
Vega 56 + Mantiz Venus + macOS + W10

---

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ardsagart
(@ardsagart)
Active Member
Joined: 6 months ago
 

Probably I have to try. I don't think there will be any access to Mac HD partition because Apple's Disk Utility (Internet Recovery Option) says the following: Mac HD partition (disk0s1) is turned off, at the same time there is a partition of free space (almost the same amount of free space as in MacHD), so it's the same. I expect the problem for MacOS to access the necessary partition.

@joevt

Posted by: @joevt

Why would you install Windows if you're trying to get macOS working?

By using the same diskpart Windows utility I tried to make the MacHD partition active. After that Windows partition started to say "Missing operation system" when I tried to boot from it. So I istalled Windows once again to have one operation system working 🙂

MacBookPro10,1 (Retina, Mid 2012). eGPU: ASUS ROG-STRIX-RX590-8G-GAMING (Sonnet eGFX Breakaway Box)


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joevt
(@joevt)
Prominent Member
Joined: 2 years ago
 

@ardsagart but you probably overwrote your Mac partition because Windows uses MBR (4 partitions max) and macOS uses GPT (many partitions). You need macOS to compare the MBR partition table and the GPT partition table to see if they are still in sync.

 

Mac mini (2018), Mac Pro (Early 2008), MacBook Pro (Retina, 15-inch, Mid 2015), GA-Z170X-Gaming 7, Sapphire Pulse Radeon RX 580 8GB GDDR5, Sonnet Echo Express III-D, Trebleet Thunderbolt 3 to NVMe M.2 case


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ardsagart
(@ardsagart)
Active Member
Joined: 6 months ago
 

Today local Apple center's specialists tried to restore the access to my Mac HD. After a few attempts they said: it's not possible.

MacBookPro10,1 (Retina, Mid 2012). eGPU: ASUS ROG-STRIX-RX590-8G-GAMING (Sonnet eGFX Breakaway Box)


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