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Question:

Question: Impossible to mount Bootcamp partition (Sierra) ! Help please !!

I had a working Bootcamp partition on my iMac mi-2011 21.5 , but after upgrading to Sierra the partition was not visible anymore and cannot be mounted (and First Aid doesn't work)

Disk Utils shows the partition greyed, named: --

The original name of the volume was BOOTCAMP i think ..


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My diskutil :


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Diskutil cs (no corestorage found) :


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And fdisk :

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Any help would be immensely appreciated. Thaaaanks guys <3

iMac, 10.12.6 Sierra OSX iMac mi-2011

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Mar 1, 2018 5:06 AM in response to Loner T In response to Loner T

I did a mistake because i tried to install Sierra on my usb key, this is why i had a efi partition on it, but this is too at this moment where my pc ******, but i always used the bootcamp assistant , my mac partition was not a guid so i just formated her and installed sierra on it , it worked but i cant mount my bootcamp partition now and i really need to fix it to use it ..

Mar 1, 2018 5:06 AM

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Mar 1, 2018 8:18 AM in response to zahreddine In response to zahreddine

This is not a valid NTFS header. You have a 'lost' NTFS header in the gap between GPT4 and GPT5.


Can you use El Capitan has deleted my bootcamp windows partition as a reference, download and install Testdisk and start a Quick Search?

Mar 1, 2018 8:18 AM

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Mar 1, 2018 9:17 AM in response to zahreddine In response to zahreddine

By the way i'm sorry i dont know what number i need to put on :

  1. (what nb here) ( - Start offset in sectors or the start point for Bootcamp part)
  2. (and here too pls) ( - Size offset, as opposed to End offset)

Thanks you btw to keep helping me its rly cool !

Mar 1, 2018 9:17 AM

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Mar 1, 2018 9:22 AM in response to zahreddine In response to zahreddine

zahreddine wrote:


By the way i'm sorry i dont know what number i need to put on :

  1. (what nb here) ( - Start offset in sectors or the start point for Bootcamp part)
  2. (and here too pls) ( - Size offset, as opposed to End offset)

Thanks you btw to keep helping me its rly cool !

Please wait for the Search to complete. Do not use any values from anywhere else, otherwise you can cause more problems.

Mar 1, 2018 9:22 AM

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Question: Impossible to mount Bootcamp partition (Sierra) ! Help please !!