Disappeared from the EFI partition

Hello

I have a macmini end of 2012. I have the dual boot with Windows 8.1 and Yosemite. I also have a third FAT partition for data sharing.

So, my setup looks like this, in Windows:

The problem is that the EFI partition is gone, so I could do reach log Windows using an external backup drive, which also had a copy backup of the EFI partition. Yes, I basically cloned this drive for a long time and I've tested all the BONES on the external hard drive, and they were all bootable. Thus, using this trick, I managed to get into Windows.

But now that I got under Windows I see as the missing EFI partition. I recently installed a customized for Win8.1 shell that makes it look like Win10. This software must have messed with the EFI partition, I don't see anything else that might have caused this.

Just before the disc became starts plu I tried a few bar custom this custom, shell that uses the app mode of Win8.1 full screen, and when I tried to quit it by closing it, he suddenly threw an error message, I clicked on cancel, then the system froze.

I pressed the power button to restart, then it's just stuck in a gray screen for minutes. Pressing ALT does not display the start menu. So, I concluded that the EFI must be wasted, so after the POWER test the computer does not find a bootable floppy. But I get no message, like the missing disk or stuff like that.

I know that there are some tools that you can use to fix your EFI partition. It runs on Windows, because I'm not sure that I can boot into OS X Yosemite. In addition, as you can see the free space on drive D, where I installed Yosemite is not reported correctly. Which clearly indicates that there must be some data from corrupt volume information.

Please install GPT Fdisk on the side Windows of https://sourceforge.net/projects/gptfdisk/ and your drive can be inspected.

In most cases, EFI is usually invisible. The 200 MB in the first instalment on disk0 seems to be your EFI. It may be a problem with the MBR is structured.

Tags: Windows Software

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