tomgrandson

Q: Windows load problem after Yosemite upgrade (A disk read error occurred)

Hello,

 

I have a big problem, but i saw im not only one...I read some similar posts, but still not working. I really need a help:

 

I use MBP Retina early 2013. Few months ago installed a bootcamp partition, everything was good, but later i needed more space on bootcamp partition, i had to extend it manually (using some application on windows). After that i got disk0s4 on Disk Utility and i cant see my Windows files from OSX. I didnt care about this, windows load and boot normally.

After upgrade from 10.9 i cant see Windows disk when i turn on with ALT. I tried some ways from this community and only i made this partition bootable, so now when i started my mac with ALT i see selection between Macintosh HD and Windows. But unfortunatelly when i choose Windows i see: "A disk read error uccurred, Press Ctrl+Alt+Del to restart". What could i do now? If someone help me and write a little guide how to solve it I will be so thankful.

 

i guess i should attach some screens from terminal, but im not sure which information is necessary to solve this issue, please let me know.

 

Thanks in advance

Tom

MacBook Pro with Retina display, OS X Yosemite (10.10)

Posted on Oct 27, 2014 6:27 AM

Close

Q: Windows load problem after Yosemite upgrade (A disk read error occurred)

  • All replies
  • Helpful answers

  • by Loner T,

    Loner T Loner T Oct 27, 2014 11:21 AM in response to tomgrandson
    Level 7 (23,813 points)
    Safari
    Oct 27, 2014 11:21 AM in response to tomgrandson

    Please post the output (from OS X Terminal) of the following commands. Enter your password when prompted by sudo.

     

    diskutil list

    sudo gpt -vv -r show /dev/disk0

    sudo fdisk /dev/disk0

     

    Changing partition sizes after Windows is installed is not supported by Apple and documented in Bootcamp FAQ - Boot Camp 5.1: Frequently asked questions.

  • by tomgrandson,

    tomgrandson tomgrandson Oct 27, 2014 2:17 PM in response to Loner T
    Level 1 (0 points)
    Oct 27, 2014 2:17 PM in response to Loner T

    Loner T, thanks for your anwswer,


    Here're output of these commands:


    diskutil list

    /dev/disk0

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *751.3 GB   disk0

       1:                        EFI EFI                     209.7 MB   disk0s1

       2:          Apple_CoreStorage                         541.3 GB   disk0s2

       3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

       4:       Microsoft Basic Data                         107.0 GB   disk0s4

    /dev/disk1

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                  Apple_HFS Macintosh HD           *540.9 GB   disk1

                                     Logical Volume on disk0s2

                                     19DFF853-DB77-4DF8-9C71-D5C5A24C9EE0

                                     Unlocked Encrypted


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


    sudo gpt -vv -r show /dev/disk0

    Password:

    gpt show: /dev/disk0: mediasize=751277983744; sectorsize=512; blocks=1467339812

    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 1467339811

           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  1057233336      2  GPT part - 53746F72-6167-11AA-AA11-00306543ECAC

      1057642976     1269536      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

      1058912512   199444224        

      1258356736   208982016      4  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

      1467338752        1027        

      1467339779          32         Sec GPT table

      1467339811           1         Sec GPT header


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


    sudo fdisk /dev/disk0

    Disk: /dev/disk0 geometry: 91337/255/63 [1467339812 sectors]

    Signature: 0xAA55

             Starting       Ending

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

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

    1: EE    0   0   2 -   25 127  14 [         1 -     409639] <Unknown ID>

    2: AF   25 127  15 - 1023 254  63 [    409640 - 1057233336] HFS+       

    3: AB 1023 254  63 - 1023 254  63 [1057642976 -    1269536] Darwin Boot

    *4: 07 1023 254  63 - 1023 254  63 [1258356736 -  208982016] HPFS/QNX/AUX



    So what can we do now?


  • by Loner T,Solvedanswer

    Loner T Loner T Oct 27, 2014 2:38 PM in response to tomgrandson
    Level 7 (23,813 points)
    Safari
    Oct 27, 2014 2:38 PM in response to tomgrandson

    Please see Yosemite Upgrade Broke Bootcamp for reference. The following tells me that you need Testdisk and Gdisk.

     

    1058912512   199444224        

      1258356736   208982016      4  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7




  • by tomgrandson,

    tomgrandson tomgrandson Oct 30, 2014 8:43 AM in response to Loner T
    Level 1 (0 points)
    Oct 30, 2014 8:43 AM in response to Loner T

    Thanks a lot, youre the boss! It worked

  • by Loner T,

    Loner T Loner T Oct 30, 2014 8:47 AM in response to tomgrandson
    Level 7 (23,813 points)
    Safari
    Oct 30, 2014 8:47 AM in response to tomgrandson

    Excellent work. Glad to see it work. Please create backups of both OSX and Windows to be safe.