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Hi, I lost my windows boot after creating a new small partition in disk utility. Could someone help me pls?
MacBook Pro with Retina display, OS X Mavericks (10.9.1), i7 4850HQ, 16GB RAM, Geforce 750M
Dear Loner;
There is an update about disks. I opened the My computer now and the Shared disk is visible but Macintosh HD is not visible. I did not change anything even I did not open the Windows for last 3 days.
What happens?
This is the new view of disk management screen
If this is the first time Windows was rebooted after the the Gdisk steps, that would explain it.
The current configuration sacrifices the visibility of OS X in favor of Shared due to the limitations of an MBR. Your W10 is a legacy MBR installation.
Your specific Mac model does support EFI/UEFI, but if you want to leverage this, unfortunately, it requires a re-installation of W10. Was your W10 an upgrade from W7/W8+?
Yes, it's upgraded from W8
What is the possibility of re-installation of W10?
It's possible but you know I have to install W8 than upgrade to W8.1 and than to W10 it's maybe 1 week just for installation windows and softwares. Are there any way to see the mac os disk or if I accept the result are there any other possible problems on bootcamp for example performance lost, stability or something similar. Because some 3d graphic softwares are working under bootcamp and I have to use bootcamp with fully performance. If I will lose something or will have stability problems, of course I will format the windows. Please make an advice about the situation.
ledstixx wrote:
It's possible but you know I have to install W8 than upgrade to W8.1 and than to W10 it's maybe 1 week just for installation windows and softwares.
Once W10 is installed and activated, you can directly install W10, because your Mac is registered with Microsoft. You no longer need to follow at W8 -> W8.1 -> W10.
Are there any way to see the mac os disk or if I accept the result are there any other possible problems on bootcamp for example performance lost, stability or something similar. Because some 3d graphic softwares are working under bootcamp and I have to use bootcamp with fully performance. If I will lose something or will have stability problems, of course I will format the windows. Please make an advice about the situation.
There is no change in performance or stability. Your Windows side should function normally as it has done in the past. There may be another solution. Let me test before I propose it.
There is a way to do this. But first the warning. If you make these changes, Recovery HD can be overwritten. If you do not manipulate any partitions any further or use any other utility to manipulate them, then you have an option to use the following...
sudo fdisk -e /dev/disk0
fdisk: could not open MBR file /usr/standalone/i386/boot0: No such file or directory
Enter 'help' for information
fdisk: 1> edit 3
Starting Ending
#: id cyl hd sec - cyl hd sec [ start - size]
------------------------------------------------------------------------
3: AB 1023 254 63 - 1023 254 63 [ 250801736 - 1269536] Darwin Boot
Partition id ('0' to disable) [0 - FF]: [AB] (? for help)
Do you wish to edit in CHS mode? [n]
Partition offset [0 - 500118192]: [250801736]
Partition size [1 - 249316456]: [249316456]
fdisk: 1> p
Disk: /dev/disk0 geometry: 31130/255/63 [500118192 sectors]
Offset: 0 Signature: 0xAA55
Starting Ending
#: id cyl hd sec - cyl hd sec [ start - size]
------------------------------------------------------------------------
1: EE 1023 254 63 - 1023 254 63 [ 1 - 409639] <Unknown ID>
2: AC 1023 254 63 - 1023 254 63 [ 409640 - 250392096] <Unknown ID>
3: AB 1023 254 63 - 1023 254 63 [ 250801736 - 249316456] Darwin Boot
*4: 0C 1023 254 63 - 1023 254 63 [ 252071936 - 248045568] Win95 FAT32L
The two highlighted questions need to have new values such that
GPT1 = MBR1
GPT2 = MBR2
GPT4 = MBR3
GPT5 = MBR4
This leaves GPT3 as Free Space which can be corrupted by Windows.
Cool... but I'm not sure about doing that because I think that is little bit alternative pro solution for my problem. So, I will use the machine with the existing configuration. At the end I can see the Shared part in both side. Why I wanted to create a shared fat partition because I needed to share some files between mac and windows as editable. So the shared part was for it and it's working now.
I think it's not so important to seeing the mac disk from windows because I could not edit it from windows. I'l try to use with existing configuration yet, If I really don't need the mac disk from windows that means there is no problem. If I really need it, re-installation will be easy way than doing your last guru solution 🙂
Thank you so much, you're really pro. I know it's not easy to fix the interesting problems like me and you did it.
Sincerely,
Please back up OS X, Windows and create a Windows System Restore point.
Ok but for what?
This would allow your current stable state to be restorable, if any future updates cause problems.
Hello Loner T;
I have same problem today. I tried to go into Windows but there is no Windows even MacOs Recovery boot options now. I did not change anything on computer can you please help me again?
Hi, I use this and Windows came back but I don't have any idea about recovery partition.
http://nerdr.com/bootcamp-partition-lost-repairing-mac-partitions/
Lost Windows startup after disk partitioning in Mac side!
