Lost Bootcamp partition after upgrade to El capitan from an old 10.8.5 OS

Hi,

i'm having trouble following your instructions.

I've started the macbook using internet recovery

After that in a terminal i've run the first command to unmount the disk0 and worked correctly : Unmount of all volumes on disk0 was succesfull.

Then i've run the second command succesfully: /dev/disk0s4 removed

but i cannot execute the third command because if i try i got an error :

Resource busy

I've tried to execute again the unmount command on disk0 again succesfully and after that i tried the third command again .

This time i got a : no space available on device

What should i do now ?

Thanks

Mattia

Roses-MacBook-Air:~ rosemagers$ diskutil list

/dev/disk0 (internal, physical):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *480.1 GB   disk0

   1:                        EFI EFI                     209.7 MB   disk0s1

   2:                  Apple_HFS Macintosh HD            60.0 GB    disk0s2

   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

Disk: /dev/disk0 geometry: 58369/255/63 [937703088 sectors]

Signature: 0xAA55

         Starting       Ending

 #: id  cyl  hd sec -  cyl  hd sec [     start -       size]

------------------------------------------------------------------------

 1: EE    0   0   2 - 1023 255  63 [         1 -  937703087] <Unknown ID>

 2: 00    0   0   0 -    0   0   0 [         0 -          0] unused      

 3: 00    0   0   0 -    0   0   0 [         0 -          0] unused      

 4: 00    0   0   0 -    0   0   0 [         0 -          0] unused      

Hi,

i've followed your instructions but there is a problem :

after the first command i got a warning : Secondary partition table overlaps the last partition by 700719137 blocks. Try reducing the partition table size by 2802876548 entries.

I initially ignored this warning and proceded to all the next steps but when i hit W at step 12 i got the same warning again and : Aborting write of new partition table.

What should i do now?

Thanks

Mattia

Done. Here is the output :

Repairing the partition map might erase disk0s1, proceed? (y/N) y

Started partition map repair on disk0

Checking prerequisites

Checking the partition list

Adjusting partition map to fit whole disk as required

Checking for an EFI system partition

Checking the EFI system partition's size

Checking the EFI system partition's file system

Checking the EFI system partition's folder content

Checking all HFS data partition loader spaces

Checking booter partitions

Checking booter partition disk0s3

Repairing file system

Checking Journaled HFS Plus volume

Checking extents overflow file

Checking catalog file

Checking multi-linked files

Checking catalog hierarchy

Checking extended attributes file

Checking volume bitmap

Checking volume information

The volume Recovery HD appears to be OK

File system check exit code is 0

Updating boot support partitions for the volume as required

Reviewing boot support loaders

Checking Core Storage Physical Volume partitions

Updating Windows boot.ini files as required

The partition map appears to be OK

Finished partition map repair on disk0

Should i try to run the previous commands again ?

Ok,

i've done what you said and after that i've rebuild the MBR using the commands you already gave me.

Now i can see the Windows partition as bootable and i can select it but when i do so i got this Windows error :

0xc00000e

The Bootcamp partition is ok now because i can see it also in Finder and i can explore it ... should i try to rebuildBCD ?

No, i can't

i can't mount the partition on disk utility. Is greyed out

Ok. I've deleted the partition as per step 2. Is it safe for me to reboot the mac ?

Nevermind. I just restarted the Mac and installed GPT Fdisk 1.05 .. I'm waiting for your instructions

YEESSS!!!

The partition is back on Mac OS !

Thank you so much.

Now i think there is only one last step to make it bootable again right ?

Thanks

Mattia

When you say lost .. you mean temporary lost or permanently lost ?

Ok,

so i will restart in internet recovery mode ... could you please tell me how to rebuild GPT4 ?

I also can confirm that after reboot i lost the bootcamp partition again