erenacar
Level 1 (8 points)
Windows Software

Q: Windows bootcamp - partition cannot be mounted

Hey all,

 

I have been using Windows on my iMac (late 2012, Yosemite 10.10.5) without a problem but today, after i booted MacOS Yosemite (for a simple file control), cannot boot back to Windows again. Didn't have any bootcamp problems before... haven't used any 3rd party disk utility either. The only thing recently I did was increasing Windows partition size 200GB by decreasing MacOS partition via Disk Utility (a month ago, no problem since then, till today)

 

1.   Windows disappeared from Startup Disk

1.png

 

2.   Disk utility shows disk0s4 greyed out and cannot be mounted. Moreover, the correct partition size was 700 GB but here its shown as 500GB (which was the old size before increasing it)

 

2.png

 

3.   When i try to reboot with ALT pressed, Windows shows up, but cannot reboot, with a black screen showing “a disk error occurred”

 

3.jpg

                                                                

I am not very familiar with any more technicals. I only tried to install “Refind” but cannot succeed anything with it.

 

I tried your advice above and seems NTFS is there...

 

4.png

 

one more thing... when I try to verify disk0s4, says "it needs to be repaired". when i hit repair; it says this:

 

5.png

 

Need my Windows ASAP, what more should i do?

 

I haven't upgraded to Sierra yet. Should I? Or will it make worse?

 

I have tons of files on Windows that I need and unfortunately not backed up for awhile anywhere (very sorry about it now).

 

Please help...

iMac, null

Posted on Oct 6, 2016 6:03 AM

by Loner T,Solvedanswer
Loner T Loner T
Level 7 (24,800 points)
Safari
A:

It was not a fairly tale ending, but glad to see some pride (and files, too) was (were) salvaged. Back up, Back up and then some more... .

Posted on Oct 15, 2016 6:49 AM

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erenacar

Q: Windows bootcamp - partition cannot be mounted

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  • by Loner T,

    Loner T Loner T Oct 7, 2016 6:44 AM in response to erenacar
    Level 7 (24,800 points)
    Safari
    Oct 7, 2016 6:44 AM in response to erenacar

    erenacar wrote:

     

    On that discussion the previous partition ended at 302.699.496 and you put 302.700.544 as start offset for BC part. there is 1.048 sectors in between. would this blank sector number be same for me or need to wait for testdisk run 7 hrs more?

    Partitions are aligned 2048 512-byte sectors. It depends on where the previous partition ends, and how much padding is necessary to get them on the next alignment boundary. It can vary is usually not fixed.

  • by erenacar,

    erenacar erenacar Oct 7, 2016 4:08 PM in response to Loner T
    Level 1 (8 points)
    Windows Software
    Oct 7, 2016 4:08 PM in response to Loner T

    ok 8 hrs later testdisk results:

     

    1.png2.png

     

    and all the big MS Data sections gave this screen when i tried "p":

    Screen Shot 2016-10-08 at 02.06.26.png

     

    Please tell me Bootcamp is recoverable from this mess.

  • by erenacar,

    erenacar erenacar Oct 7, 2016 4:17 PM in response to erenacar
    Level 1 (8 points)
    Windows Software
    Oct 7, 2016 4:17 PM in response to erenacar

    only last 3 sections gave useless things:

     

    Screen Shot 2016-10-08 at 02.09.10.png

    Screen Shot 2016-10-08 at 02.09.36.png

     

    Screen Shot 2016-10-08 at 02.10.19.png

     

    Now I started Deeper Search. Will report the results in 17 hrs once it finished.

  • by Loner T,

    Loner T Loner T Oct 7, 2016 4:25 PM in response to erenacar
    Level 7 (24,800 points)
    Safari
    Oct 7, 2016 4:25 PM in response to erenacar

    None of these look like parts of your BC partition. Let us see what Deeper Search brings.

  • by erenacar,

    erenacar erenacar Oct 7, 2016 4:27 PM in response to Loner T
    Level 1 (8 points)
    Windows Software
    Oct 7, 2016 4:27 PM in response to Loner T

    The big ones said "filesystem damaged"... that doesn't mean I lost my Windows files, just need to correct the filesystem right? ah please.

  • by Loner T,

    Loner T Loner T Oct 7, 2016 4:46 PM in response to erenacar
    Level 7 (24,800 points)
    Safari
    Oct 7, 2016 4:46 PM in response to erenacar

    erenacar wrote:

     

    and all the big MS Data sections gave this screen when i tried "p":

    Screen Shot 2016-10-08 at 02.06.26.png

     

    Please tell me Bootcamp is recoverable from this mess.

    This looked promising. There is a way to repair the MFT using chkdsk. Testdisk has limited capabilities on a Mac. Did you check all visible MS Data?

  • by erenacar,

    erenacar erenacar Oct 8, 2016 10:19 AM in response to Loner T
    Level 1 (8 points)
    Windows Software
    Oct 8, 2016 10:19 AM in response to Loner T

    Yes I checked them all. Mostly damaged. Still waiting for deep search. in the meantime could u look into this:

     

    I ran EaseUS file recovery software for NTFS and recovered 2 types of files in thousands:

     

    1. Raw data: As expected, all files are in generic names (file1.xls, file2.xls. etc.). some of the files (mostly pdf) are corrupted. some of them usable. problem: more than 20.000 in number, will take months to click them all one by one. and of course there are no folders, have to classify them one by one.

     

    2. Recovered files: All original filenames in correct folders. But none usable, all corrupted. I kept them just to remember folder structure and what were in them.

     

    a. Why are all 2nd type files corrupted? Because of my dead MFT?

    b. If i use another data recovery program, would it get better? at least for recovering more raw files?

    c. There are many more windows-based software. if I install parallels desktop and use them, will this make sense?

    d. Some guys suggested using NTFS software like Tuxera. Without correcting MFT, can this be a recovery solution?

  • by erenacar,

    erenacar erenacar Oct 8, 2016 10:49 AM in response to erenacar
    Level 1 (8 points)
    Windows Software
    Oct 8, 2016 10:49 AM in response to erenacar

    BTW, I cloned NTFS to an external HDD and I have a spare macbook (no ntfs or partitions) to work on.  If this will provide any other solutions.

  • by erenacar,

    erenacar erenacar Oct 8, 2016 3:50 PM in response to erenacar
    Level 1 (8 points)
    Windows Software
    Oct 8, 2016 3:50 PM in response to erenacar

    Deep search is over:

    1.png

     

    A very long list starting with rare big chunks of MS data:

     

    2.png

     

    some more:

    3.png

     

    and more:

    4.png

     

    and the ending:

    5.png

     

    I tried all big MS data, with the unfortunate result:

    6.png

     

     

    so, now... how do I use chkdsk?

  • by Loner T,

    Loner T Loner T Oct 9, 2016 1:56 AM in response to erenacar
    Level 7 (24,800 points)
    Safari
    Oct 9, 2016 1:56 AM in response to erenacar

    You cannot use chkdsk in Testdisk, but you can try and repair your MFT. First you need to pick the correct partition. Chkdsk can be run from a Windows Installer.

     

    EaseUS is looking at individual file headers, not the MFT. The corruption may be more extensive.

  • by erenacar,

    erenacar erenacar Oct 9, 2016 2:14 AM in response to Loner T
    Level 1 (8 points)
    Windows Software
    Oct 9, 2016 2:14 AM in response to Loner T

    So now I don't have anything to solve this? Do you have any suggestions? Or did deep search results confirm I am helpless?

  • by Loner T,

    Loner T Loner T Oct 9, 2016 2:53 AM in response to erenacar
    Level 7 (24,800 points)
    Safari
    Oct 9, 2016 2:53 AM in response to erenacar

    Let use first try to rebuild the MFT using a Windows Installer. My guess is that the second "Macintosh HD2" creation caused more damage than the first issue.

     

    What is the possibility of re-instaling Windows? How much data would you lose?

  • by erenacar,

    erenacar erenacar Oct 9, 2016 4:00 AM in response to Loner T
    Level 1 (8 points)
    Windows Software
    Oct 9, 2016 4:00 AM in response to Loner T

    I got 50Gb of needed files on corrupt BC partition. Losing that will be very unpleasent for me. Mac side was useless for me. Do u mean installing on newly created HD2? I can manage loss of some data but I was hoping to recover some of BC.

  • by Loner T,

    Loner T Loner T Oct 9, 2016 6:16 AM in response to erenacar
    Level 7 (24,800 points)
    Safari
    Oct 9, 2016 6:16 AM in response to erenacar

    If you can use a Unix dd and can make a copy of the whole internal disk, then we can experiment with the internal disk and fall back to the external copy, if necessary for restoring back a clean copy.

     

    I suggest not manipulating the internal disk in any way before you make such a DD copy.

  • by erenacar,

    erenacar erenacar Oct 9, 2016 6:27 AM in response to Loner T
    Level 1 (8 points)
    Windows Software
    Oct 9, 2016 6:27 AM in response to Loner T

    Not familiar with that, will I need a Unix-installed laptop? Can it be done by creating a VM on MacOs and installing Ubuntu, and then dd the image on a 2TB external HDD (if yes, should it be formatted exFat?)  The corrupted NTFS is in a 27 iMac and we don't have an Apple shop nearby, meaning it will be very diffulct for me to take the physical HDD out (to connect to another Unix-based machine).

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