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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

Posted on Feb 28, 2018 4:16 PM

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35 replies

Mar 1, 2018 11:25 AM in response to zahreddine

We are interested in three entries listed below.

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Use the down arrow key and scroll down to the first entry, and press 'p', take a screen capture and post it. Press Escape (only once), and scroll to the next entry and press 'p' and post the screen capture. Repeat for the last entry.


We need to see which of these three have your NTFS Data. The output should look similar to the following.


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Mar 1, 2018 9:22 AM 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 5:06 AM 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 ..

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

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