texasgameboy15x
Level 1 (8 points)
Windows Software

Q: Error loading operating system

Basically, I had to follow a guide by Loner T to get Windows 10 Bootcamp to boot again because I got that same "no boot disc" error after trying to create another partition of 63GB titled "Other". Well, that solution got my bootcamp partition to boot again, but I then booted into Windows to add the new partition I created to extend my bootcamp partition (using Mini Tool Partition Wizard). For some reason, though, I had to only extend the bootcamp partition using 62GB out of the 63GB because for some reason it was telling me I couldn't use it all due to some overlapping error. I booted back into OS X, and then I installed Paragon NTFS for Mac that came with this new Seagate 2TB external hard drive that I got, and restarted the computer (without doing anything with Paragon...I didn't even erase or partition anything with my external hard drive). Before the reboot though, I'm not sure if I saw that my Bootcamp partition was still there, but after the reboot I opened Disk Utility and my bootcamp partition was missing. I see the new partition that I made earlier (63GB), though, but it shows empty. If I restart my Macbook while holding Option key, my Windows partition is still there but it's not bootable and tells me "error loading operating system." But for some reason bootcamp is not in Disc Utility or in startup disks either...any idea how to fix this?


AUSTIN-DAILEY-MAC:~ austindailey$ diskutil list

/dev/disk0 (internal, physical):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *500.1 GB   disk0

   1:                        EFI EFI                     209.7 MB   disk0s1

   2:                  Apple_HFS Macintosh HD            336.0 GB   disk0s2

   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

   4:                  Apple_HFS Other                   62.2 GB    disk0s4

   5:       Microsoft Basic Data                         100.7 GB   disk0s5

/dev/disk1 (external, physical):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *2.0 TB     disk1

   1:                        EFI EFI                     209.7 MB   disk1s1

   2:                  Apple_HFS ACD-BACKUP              350.0 GB   disk1s2

   3:       Microsoft Basic Data ACD-DRIVE               1.6 TB     disk1s3

/dev/disk2 (external, physical):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:     FDisk_partition_scheme                        *1.0 TB     disk2

   1:                 DOS_FAT_32 ACD-DRIVE               500.1 GB   disk2s1

   2:                  Apple_HFS ACD-BACKUP              500.1 GB   disk2s2

AUSTIN-DAILEY-MAC:~ austindailey$ diskutil cs list

No CoreStorage logical volume groups found

AUSTIN-DAILEY-MAC:~ austindailey$ sudo gpt -vv -r show /dev/disk0

Password:

gpt show: /dev/disk0: mediasize=500107862016; sectorsize=512; blocks=976773168

gpt show: /dev/disk0: Suspicious MBR at sector 0

gpt show: /dev/disk0: Pri GPT at sector 1

gpt show: /dev/disk0: Sec GPT at sector 976773167

      start       size  index  contents

          0          1         MBR

          1          1         Pri GPT header

          2         32         Pri GPT table

         34          6        

         40     409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

     409640  656326280      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC

  656735920    1269536      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

  658005456  121515200      4  GPT part - 48465300-0000-11AA-AA11-00306543ECAC

  779520656     262144        

  779782800  196728184      5  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

  976510984     262151        

  976773135         32         Sec GPT table

  976773167          1         Sec GPT header

AUSTIN-DAILEY-MAC:~ austindailey$ sudo fdisk /dev/disk0

Disk: /dev/disk0 geometry: 60801/255/63 [976773168 sectors]

Signature: 0xAA55

         Starting       Ending

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

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

1: EE    0   0   2 - 1023 254  63 [         1 -  656735919] <Unknown ID>

2: AB 1023 254  63 - 1023 254  63 [ 656735920 -    1269536] Darwin Boot

3: AF 1023 254  63 - 1023 254  63 [ 658005456 -  121515200] HFS+       

*4: 07 1023 254  63 - 1023 254  63 [ 779782800 -  196728184] HPFS/QNX/AUX

iPod touch, Windows 7

Posted on Sep 29, 2016 8:31 PM

by Loner T,Solvedanswer
Loner T Loner T
Level 7 (24,738 points)
Safari
A:

Install GPT Fdisk (aka gdisk).  Leave your Testdisk display and start a new Terminal Window. You need to use the following steps. If you see any error messages during the following steps, please stop and post back here with the error message. The following steps have values from your Testdisk output (and you can verify) in Steps 7 and 8. Please notice the '+' sign in step 8 (this is called offset notation). The text in parentheses is for informational purpose to describe the action being taken. Gdisk has one-character commands except when entering numbers. These are non-standard steps and should not be used under any other circumstances. Your layout is special case because you have GPT4 and GPT5 which the MPT did not correctly manipulate. You will have about 1Gb free. A single GPT4 replaces the old GPT4+GPT5.


Rebuild GPT4 using start/end offsets

  1. Sudo gdisk /dev/rdisk0
  2. P  (print the full list of parts)
  3. D  (delete)
  4. 4  (part 4)
  5. D (delete)
  6. 5 (part 5)
  7. N  (new part)
  8. 4  (part 4)
  9. 660191640 ( - Start offset in sectors or the start point for Bootcamp part)
  10. +316319337 ( - Size offset, as opposed to End offset)
  11. 0700 (Windows part type)
  12. P  (print list of all parts just to see what changes will be made)
  13. W (Write the new GPT)
  14. Y  (Yes! really write the new GPT)

This will delete and re-write the GPT partition info for /dev/disk0s4.

 

Rebuild MBR to match the new GPT information thus resetting the Hybrid MBR. Use defaults for other questions (like partition codes). The only values that need modifications are the Boot flags and step 10. Accept all other defaults that Gdisk offers. Please see the sample Q&A as an example. These steps can be repeated if you make a mistake before you get to Step 12, otherwise start from Step 1 for these steps. Step 6 has numbers which are typed with a space between the numbers. Please see the sample Q&A before you execute these steps.

  1. Sudo gdisk /dev/rdisk0
  2. P  (Print list of parts)
  3. R  (Recover)
  4. O (print current Hybrid MBR)
  5. H (chooses Hybrid)
  6. Partitions numbers to be hybridized: 2 3 4
  7. Y  (Good for GRUB question)
  8. N  (part 2 boot flag)
  9. N  (part 3 boot flag)
  10. Y  (part 4 boot flag make NTFS bootable partition)
  11. O  (print current Hybrid MBR)
  12. W (Write the new MBR)
  13. Y (Yes! write the new MBR)
  14. Reboot

 

Here is sample Q&A for this section. Please notice the Press Enter/Return.

 

Place EFI GPT (0xEE) partition first in MBR (good for GRUB)? (Y/N): Y

 

Creating entry for GPT partition #2 (MBR partition #2)

Enter an MBR hex code (default AF): Press Enter/Return

Set the bootable flag? (Y/N): N

 

Creating entry for GPT partition #3 (MBR partition #3)

Enter an MBR hex code (default AB): Press Enter/Return

Set the bootable flag? (Y/N): N

 

Creating entry for GPT partition #4 (MBR partition #4)

Enter an MBR hex code (default 07): Press Enter/Return

Set the bootable flag? (Y/N): Y

 

Test 1 - Does Bootcamp Volume show up in Finder?

Test 2 - Can you see files in Bootcamp Volume?

Test 3 - Can you select Bootcamp in System Preferences -> Startup Disk?

Test 4 - If Test 3 is successful, select Bootcamp and Click Restart.

Posted on Oct 1, 2016 8:01 AM

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texasgameboy15x

Q: Error loading operating system

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  • Helpful answers

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  • by Loner T,

    Loner T Loner T Sep 29, 2016 8:50 PM in response to texasgameboy15x
    Level 7 (24,738 points)
    Safari
    Sep 29, 2016 8:50 PM in response to texasgameboy15x

    You have two separate issues.

     

    1. Your MBR was rebuilt using GPT entries 3 4 5. To MPT, this MBR appears with 'Other' as an HFS+ disk, which it cannot manipulate. It can however use FAT/exFAT. I would not recommend it. Instead, I suggest using this method. It requires converting 'Other' to Free Space instead of HFS+. MPT cannot distinguish between a MBR disk and a GPT disk with a Hybrid MBR. It only manipulates the disk (incorrectly) as MBR, which causes GPT issues. If you choose the GParted method, you will need to rebuild the MBR again using 2 3 4, because free space has not disk slice. If you want to convert 'Other' to Free Space, please run the following command only once (otherwise you will lose data),

     

    diskutil eraseVolume free free disk0s4

     

    This returns an error because diskutil expects a disk to reappear, but free space has not disk slice. 

     

    2. Paragon NTFS driver interferes with Apple NTFS driver. Apple will not allow partitions that it does not control to appear in Startup Disk. Please see https://kb.paragon-software.com/article/204 as the Paragon explanation. I suggest removing Paragon NTFS. It is used by Seagate to hide the fact that it's drives are shipped as NTFS and cannot be written by default. To reduce customer calls, they have chosen to provide a read-write Paragon, instead of asking customers to reformat the disk to GPT. This also has the benefit of mobility of the same file system between OS X and Windows without the customer knowing it.

  • by texasgameboy15x,

    texasgameboy15x texasgameboy15x Sep 29, 2016 9:05 PM in response to Loner T
    Level 1 (8 points)
    Windows Software
    Sep 29, 2016 9:05 PM in response to Loner T

    Thanks for the reply and help, I really appreciate it.

     

    I party understand what you're saying about using Gparted, but I have already used Mini Partition Tool which extended my bootcamp partition while in Windows. It then asked to restart Windows to finish the extension, which succeeded because I was able to boot back into Windows after the restart and clearly had more space on the partition. After using Windows for awhile, I eventually booted back into OS X and tried to set up my new Seagate external hard drive and installed Paragon, and this is when I noticed my bootcamp partition was missing. So is my Windows bootcamp partition still there? And if I run this command you're telling me, will I be able to boot back into my Windows bootcamp partition? I'm just confused about how this will save me from losing any data on my Windows bootcamp partition.

     

    Edit: By the way, I already uninstalled Paragon.

  • by Loner T,

    Loner T Loner T Sep 30, 2016 4:37 AM in response to texasgameboy15x
    Level 7 (24,738 points)
    Safari
    Sep 30, 2016 4:37 AM in response to texasgameboy15x

    texasgameboy15x wrote:

     

    Thanks for the reply and help, I really appreciate it.

     

    I party understand what you're saying about using Gparted, but I have already used Mini Partition Tool which extended my bootcamp partition while in Windows. It then asked to restart Windows to finish the extension, which succeeded because I was able to boot back into Windows after the restart and clearly had more space on the partition.

    MPT updated only the MBR, not realizing that the MBR was built on top of the GPT. This creates a discrepancy between the partition that OS X has in the GPT table and the one that MPT modified. These are the two outputs you posted - the gpt and fdisk command outputs show the two different table structures. By using the steps in the link and recreating the MBR with 3 4 5, you overwrote the MBR that MPT had manipulated. This now has the effect of showing both of them in sync.

     

    779782800  196728184      5  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

    and

    *4: 07 1023 254  63 - 1023 254  63 [ 779782800 -  196728184] HPFS/QNX/AUX

    are now pointing to same location.

    After using Windows for awhile, I eventually booted back into OS X and tried to set up my new Seagate external hard drive and installed Paragon, and this is when I noticed my bootcamp partition was missing. So is my Windows bootcamp partition still there?

    This added additional complications. Your partition should still be there.

     

    And if I run this command you're telling me, will I be able to boot back into my Windows bootcamp partition? I'm just confused about how this will save me from losing any data on my Windows bootcamp partition.

    We are not manipulating any partitions yet. All the commands so far show the contents, but do not modify any partition tables. The following command shows the first block of the NTFS header.

     

    sudo dd if=/dev/rdisk05 count=1 2>/dev/null | hexdump -C

     

    4:                  Apple_HFS Other                   62.2 GB    disk0s4

    This entry still shows the 62GB GPT entry that was apparently added by MPT to Windows. This is HFS+, so OS X can read-write/verify/update this part. The moment this is touched (as after a reboot), your NTFS header is most likely overwritten.

     

    For some reason, though, I had to only extend the bootcamp partition using 62GB out of the 63GB because for some reason it was telling me I couldn't use it all due to some overlapping error.

    This is the first hint of trouble, and this is where any further changes should have been stopped.

  • by texasgameboy15x,

    texasgameboy15x texasgameboy15x Sep 30, 2016 4:46 AM in response to Loner T
    Level 1 (8 points)
    Windows Software
    Sep 30, 2016 4:46 AM in response to Loner T

    Okay, so what is my next step on fixing this? Is it possible to get everything back to normal and working correctly without having any data lost and maintaining my Windows bootcamp partition?

  • by Loner T,

    Loner T Loner T Sep 30, 2016 4:47 AM in response to texasgameboy15x
    Level 7 (24,738 points)
    Safari
    Sep 30, 2016 4:47 AM in response to texasgameboy15x

    Can you post the output of the dd command?

  • by texasgameboy15x,

    texasgameboy15x texasgameboy15x Sep 30, 2016 4:52 AM in response to Loner T
    Level 1 (8 points)
    Windows Software
    Sep 30, 2016 4:52 AM in response to Loner T

    I did

     

    sudo dd if=/dev/rdisk05 count=1 2>/dev/null | hexdump -C

     

    but there is no output...

  • by Loner T,

    Loner T Loner T Sep 30, 2016 4:54 AM in response to texasgameboy15x
    Level 7 (24,738 points)
    Safari
    Sep 30, 2016 4:54 AM in response to texasgameboy15x

    Please try

     

    sudo dd if=/dev/rdisk0s5 count=1 2>/dev/null | hexdump -C

  • by texasgameboy15x,

    texasgameboy15x texasgameboy15x Sep 30, 2016 5:38 AM in response to Loner T
    Level 1 (8 points)
    Windows Software
    Sep 30, 2016 5:38 AM in response to Loner T

    00000000  1a b6 92 89 b4 3d f1 06  11 fc 42 cf cb 74 30 42  |.....=....B..t0B|

    00000010  b8 9a e4 a5 2c 08 cc 63  31 a0 1c b9 27 54 6c f7  |....,..c1...'Tl.|

    00000020  8f 05 65 de 96 b1 65 24  2f 68 13 1a 6a 24 bb 10  |..e...e$/h..j$..|

    00000030  ab 44 de 23 c5 ea 18 89  67 9d 92 58 7c a4 3a 08  |.D.#....g..X|.:.|

    00000040  a5 84 19 a9 15 ea 28 0a  0b 9f f3 1a 21 26 b1 28  |......(.....!&.(|

    00000050  64 4e 95 e1 78 04 f5 fa  18 0a 16 67 98 1b 71 20  |dN..x......g..q |

    00000060  15 c1 56 48 90 77 61 45  04 1d 35 1f 1b 9c 0c 05  |..VH.waE..5.....|

    00000070  14 32 2e 8d 48 24 90 f4  b1 ef 3a c2 77 28 81 03  |.2..H$....:.w(..|

    00000080  50 b1 a0 cd 32 b9 87 b0  36 7e c9 11 58 66 e6 11  |P...2...6~..Xf..|

    00000090  2b 51 90 b7 23 96 84 9c  0d f7 31 81 28 ea 36 63  |+Q..#.....1.(.6c|

    000000a0  9f 5d 82 89 c8 34 8a 3e  50 04 f4 11 d4 e8 f8 23  |.]...4.>P......#|

    000000b0  09 0c 2f 02 38 bb c7 ad  61 ae 7b 14 0a 45 f0 77  |../.8...a.{..E.w|

    000000c0  8c ec d6 e6 70 2b 1c fe  e1 91 50 ba 32 b4 8a 3c  |....p+....P.2..<|

    000000d0  b4 dd 52 56 1e 01 5d 11  a8 ea bf 4b db 86 0f 75  |..RV..]....K...u|

    000000e0  07 35 3e 11 91 1b 52 e1  18 35 42 df 8f 50 83 f0  |.5>...R..5B..P..|

    000000f0  23 93 0a 77 74 18 92 20  8c 50 31 fb 1b c9 63 96  |#..wt.. .P1...c.|

    00000100  3d b2 63 c6 36 d2 98 7b  e4 ab 31 5b 1e d9 0e e2  |=.c.6..{..1[....|

    00000110  40 21 8f f4 cc f2 11 e9  4b 2d 03 0e f0 be 23 40  |@!......K-....#@|

    00000120  dd c6 49 a8 b2 c2 8c 50  10 fa e4 60 ed 89 4d e4  |..I....P...`..M.|

    00000130  f0 4e 74 7c fa 46 42 99  e4 a3 04 11 2a 7d 06 75  |.Nt|.FB.....*}.u|

    00000140  48 e6 8a 11 94 f5 8c 26  23 99 de c1 b1 c3 ef bf  |H......&#.......|

    00000150  42 1b 10 2e 85 ab 6e 04  43 f9 ee 74 00 2c 61 65  |B.....n.C..t.,ae|

    00000160  d4 1c f7 3f fa 0d c7 86  6a d7 02 a9 a4 15 6a 63  |...?....j.....jc|

    00000170  24 14 0a 62 23 37 87 86  7a 7c 95 11 a8 e0 44 4d  |$..b#7..z|....DM|

    00000180  9a 38 c4 23 71 fc 0b 75  84 08 52 04 94 f0 61 26  |.8.#q..u..R...a&|

    00000190  ac d8 46 22 a8 a5 da 05  1c 21 f8 cf 6c 19 1a 46  |..F".....!..l..F|

    000001a0  f2 aa 29 91 a1 54 54 5f  63 a1 60 be aa 3e 9a 50  |..)..TT_c.`..>.P|

    000001b0  14 f6 dd 24 28 b0 85 3d  ce 08 83 1a fb 6d b7 01  |...$(..=.....m..|

    000001c0  43 0d 80 fd 00 00 63 55  68 9a b8 aa a8 9a 08 ba  |C.....cUh.......|

    000001d0  b7 0a a8 aa a8 aa 98 a9  a8 0a b8 a9 98 00 a7 b9  |................|

    000001e0  08 ab b7 9a 08 aa b7 aa  98 0a 99 aa a8 ab a8 aa  |................|

    000001f0  99 b9 a8 9a a8 aa a8 ba  98 9b b8 ba b9 aa b7 ab  |................|

    00000200

  • by Loner T,

    Loner T Loner T Sep 30, 2016 5:50 AM in response to texasgameboy15x
    Level 7 (24,738 points)
    Safari
    Sep 30, 2016 5:50 AM in response to texasgameboy15x

    Please download Testdisk - http://www.cgsecurity.org/wiki/TestDisk_Download - and run a Testdisk scan and look for a NTFS header.

     

    Use El Capitan has deleted my bootcamp windows partition as a UI reference to run Testdisk.

  • by texasgameboy15x,

    texasgameboy15x texasgameboy15x Sep 30, 2016 11:48 AM in response to Loner T
    Level 1 (8 points)
    Windows Software
    Sep 30, 2016 11:48 AM in response to Loner T

    I got this far.

    Screen Shot 2016-09-30 at 2.46.19 PM.png

  • by Loner T,

    Loner T Loner T Sep 30, 2016 11:51 AM in response to texasgameboy15x
    Level 7 (24,738 points)
    Safari
    Sep 30, 2016 11:51 AM in response to texasgameboy15x

    Press Enter/Return to Continue.

  • by texasgameboy15x,

    texasgameboy15x texasgameboy15x Sep 30, 2016 12:01 PM in response to Loner T
    Level 1 (8 points)
    Windows Software
    Sep 30, 2016 12:01 PM in response to Loner T

    I figured but it looked like there were three options to press Continue on, so wasn't sure if I needed to select a different one.

    Screen Shot 2016-09-30 at 3.01.38 PM.png

  • by Loner T,

    Loner T Loner T Sep 30, 2016 12:11 PM in response to texasgameboy15x
    Level 7 (24,738 points)
    Safari
    Sep 30, 2016 12:11 PM in response to texasgameboy15x

    Use the down arrow key and highlight the first MS Data entry and press 'P' to list the contents of that partition. If you do not see any familiar Windows files, press Escape (only once) and scroll to the next MS Data and press 'P' to list files.  Subsequent MS Data entries are not very interesting.

     

    You are looking for a display similar to

     

    Testdisk-GoodWindowsPartition.png

  • by texasgameboy15x,

    texasgameboy15x texasgameboy15x Sep 30, 2016 12:17 PM in response to Loner T
    Level 1 (8 points)
    Windows Software
    Sep 30, 2016 12:17 PM in response to Loner T

    1st, 5th, 7th, and 8th MS Data Entries had things listed, as shown below.

     

    1st

    Screen Shot 2016-09-30 at 3.14.45 PM.png

    5th

    Screen Shot 2016-09-30 at 3.14.56 PM.png

    7th

    Screen Shot 2016-09-30 at 3.15.15 PM.png

    8th

    Screen Shot 2016-09-30 at 3.15.27 PM.png

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