Need help with a disk read error occured Bootcamp and Win7

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MarcKinLA Author

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Need help with a disk read error occured Bootcamp and Win7

Hello All,

I'm stuck after performing a hard drive resize.

Hardware is iMac 24 wih a 2TB Segate SSDHD Hybrid drive (dont think it matters though)

partitioned as follows: mac OSX and win7 with bootcamp also there is a Recovery-10.10.3 partition

I downsized the Mac partition with disk utility in order to make the win7 partition bigger (was running out of space). After freeing up space i used

Acronis Disk Director 2011 Home that i paid for to resize the windows partition. After it did all its magic i ended up with a black screen stating

"A disk read error occured Press Ctrl+Alt+Del to restart"

OK Apple thanks for turning the iphone pic sideways ! Lol

anyway i can see all the operating systems in bootcamp when i hold the option key while booting and i can access the windows partion read only from finder eventhough win7 will not boot.

i've gotten conflicting info that the utility damaged the boocamp settings to i need to wipe the complete drive and start over. I dont think any of that sounds correct

Any suggestions on what to check or do would be very much appreciated

TiA

Marc

iMac, OS X Yosemite (10.10.5)

Posted on Aug 30, 2015 6:52 PM

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Answer 1

MarcKinLA Author

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Aug 30, 2015 9:44 PM in response to MarcKinLA

Also ran the following to collect info

$ df

Filesystem 512-blocks Used Available Capacity iused ifree %iused Mounted on

/dev/disk0s2 1953125000 1625329600 327283400 84% 203230198 40910425 83% /

devfs 360 360 0 100% 625 0 100% /dev

map -hosts 0 0 0 100% 0 0 100% /net

map auto_home 0 0 0 100% 0 0 100% /home

/dev/disk0s4 1952223224 222083960 1730139264 12% 349000 865069816 0% /Volumes/Windows_7

$ diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *2.0 TB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_HFS Untitled 1 1000.0 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

4: Microsoft Basic Data Windows_7 999.5 GB disk0s4

$ sudo fdisk /dev/rdisk0

Disk: /dev/rdisk0 geometry: 243201/255/63 [3907029168 sectors]

Signature: 0xAA55

Starting Ending

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

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

1: EE 1023 254 63 - 1023 254 63 [ 1 - 409639] <Unknown ID>

2: AF 1023 254 63 - 1023 254 63 [ 409640 - 1953125000] HFS+

3: AB 1023 254 63 - 1023 254 63 [1953534640 - 1269536] Darwin Boot

*4: 07 1023 254 63 - 1023 254 63 [3674607616 - 232421376] HPFS/QNX/AUX

$ sudo gpt -r -vv show /dev/rdisk0

gpt show: /dev/rdisk0: mediasize=2000398934016; sectorsize=512; blocks=3907029168

gpt show: /dev/rdisk0: Suspicious MBR at sector 0

gpt show: /dev/rdisk0: Pri GPT at sector 1

gpt show: error: bogus map

gpt show: unable to open device '/dev/rdisk0': Undefined error: 0

$

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Answer 2

Loner T

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59,471 points

Aug 31, 2015 5:36 AM in response to MarcKinLA

This is a known issue with any partitioning tool which does not understand Hybrid MBRs and knows how to keep GPT and MBR in sync. Many have been wounded by this sword. The GPT being corrupt is one obvious side effect. Apple does not support resizing Windows due to the inability of tools to properly understand this construct. You can read more at http://www.rodsbooks.com/gdisk/hybrid.html .

Can you look at Windows partition missing from bootcamp. and use Testdisk to start a scan? Please download GPT Fdisk and post the output of the following commands. (p and q are commands used after you see Gdisk prompt).

sudo gdisk /dev/disk0

p

q

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Answer 3

MarcKinLA Author

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Aug 31, 2015 2:18 PM in response to Loner T

Thanks LoanerT for helping out ! Where can I find a copy of the software you mention ? Can I run it from my working OS X or does it need to run from a boot cd or usb ??

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Answer 4

Loner T

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59,471 points

Aug 31, 2015 3:32 PM in response to MarcKinLA

You can Find GPT Fdisk at http://sourceforge.net/projects/gptfdisk/ . You can run it from OSX or Windows. Since your GPT is not clean, my recommendations is OSX.

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Answer 5

MarcKinLA Author

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Aug 31, 2015 5:21 PM in response to Loner T

GPT fdisk (gdisk) version 1.0.0

Warning: Devices opened with shared lock will not have their

partition table automatically reloaded!

Partition table scan:

MBR: hybrid

BSD: not present

APM: not present

GPT: present

Found valid GPT with hybrid MBR; using GPT.

Command (? for help): p

Disk /dev/disk0: 3907029168 sectors, 1.8 TiB

Logical sector size: 512 bytes

Disk identifier (GUID): 560DB076-BBA3-4012-A89F-A7679AEA1F81

Partition table holds up to 128 entries

First usable sector is 34, last usable sector is 3907029134

Partitions will be aligned on 8-sector boundaries

Total free space is 1733 sectors (866.5 KiB)

Number Start (sector) End (sector) Size Code Name

1 40 409639 200.0 MiB EF00 EFI System Partition

2 409640 1953534639 931.3 GiB AF00 Untitled 1

3 1953534640 1954804175 619.9 MiB AB00 Recovery HD

4 1954805760 3907028991 930.9 GiB 0700 BOOTCAMP

Command (? for help): q

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Answer 6

MarcKinLA Author

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Aug 31, 2015 5:47 PM in response to MarcKinLA

I'm having trouble posting the test disk log the forum software is nagging that the message contains invalid characters any work arounds ?

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Answer 7

Loner T

Level 9

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Aug 31, 2015 5:57 PM in response to MarcKinLA

Please download Testdisk (http://www.cgsecurity.org/wiki/TestDisk_Download) and start a scan. Please see the initial screens at https://imgur.com/a/PjmnK .

The Testdisk binary will be in the directory where you download and extract it.

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Answer 8

MarcKinLA Author

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Aug 31, 2015 6:03 PM in response to Loner T

Hi I did that I can't port the logs here via cut and paste ? the board says the msg has invalid characters

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Answer 9

Loner T

Level 9

59,471 points

Aug 31, 2015 6:05 PM in response to MarcKinLA

Please post PNG or JPG files using Grab or any other tool that you have on the OS X side. The invalid character issue does come very often.

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Answer 10

MarcKinLA Author

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Aug 31, 2015 6:18 PM in response to MarcKinLA

Try this

https://drive.google.com/open?id=0B0qq6CSOSkPtbUpQU0h2RHhCUFE

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Answer 11

Loner T

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59,471 points

Aug 31, 2015 6:20 PM in response to MarcKinLA

It is not public. You can also use imgur.com or many other image sharing services to post a link.

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Answer 12

MarcKinLA Author

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Aug 31, 2015 6:30 PM in response to Loner T

Changed Permissions maybe now sorry for the mess apple let me post my logs so we don't have to deal with this in addition to a broken hard drive !

https://drive.google.com/folderview?id=0B0qq6CSOSkPtfmQ1OWY3OGpSbUZqcFM4VnpPSWN5 M3lGZ1pSVHJMWXZINWtGbTFucVFqeTg&usp=shar…

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Answer 13

Loner T

Level 9

59,471 points

Aug 31, 2015 6:51 PM in response to MarcKinLA

It may be better to post what you see on your screen.

1. Use Applications -> Utilities -> Grab to take a rectangular selection of a window or the whole window.

2. Click on Edit on the Menu Bar, click on Copy.

3. Open Applications -> Preview and click on File -> New from the Clipboard.

4. Save the file as a PNG.

5. Click on the Camera icon at the top of the reply box and select the file and post it.

In the second post, the link to another discussion will show you the types of screens that are useful.

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Answer 14

MarcKinLA Author

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Aug 31, 2015 7:35 PM in response to Loner T

Ok will try that, which disk should I select I have dev/disk0 and dev/rdisk0 why is there two ?

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Answer 15

MarcKinLA Author

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Aug 31, 2015 8:05 PM in response to MarcKinLA

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