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Windows partition lost after Yosemite Upgrade

Hi, Me too. I hope LonerT or someone else can help.


System

iMac , mid 2010

Processor 3.06 i3

RAM 4 Gb

Boot ROM IM112.0057.B01

SMC 1.64f5

Model Name: iMac

SMC Version (system): 1.64f5

Here is the output from distil, gpt and disk


Many thanks


administrator$ diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *500.1 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_HFS Macintosh HD 249.0 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

4: Microsoft Basic Data Win7 250.2 GB disk0s4



BettyIggosiMac:~ administrator$ diskutil cs list

No CoreStorage logical volume groups found

BettyIggosiMac:~ administrator$ sudo gpt =vv =r show /dev/disk0


WARNING: Improper use of the sudo command could lead to data loss

or the deletion of important system files. Please double-check your

typing when using sudo. Type "man sudo" for more information.


To proceed, enter your password, or type Ctrl-C to abort.


Password:


BettyIggosiMac:~ administrator$ sudo gpt -vv -r show /dev/disk0

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 486328128 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC

486737768 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

488007304 376

488007680 488765440 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

976773120 15

976773135 32 Sec GPT table

976773167 1 Sec GPT header

BettyIggosiMac:~ administrator$ 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 1023 254 63 - 1023 254 63 [ 1 - 409639] <Unknown ID>

2: AF 1023 254 63 - 1023 254 63 [ 409640 - 486328128] HFS+

3: AB 1023 254 63 - 1023 254 63 [ 486737768 - 1269536] Darwin Boot

4: 0C 1023 254 63 - 1023 254 63 [ 488007680 - 488765440] Win95 FAT32L

iMac, OS X Yosemite (10.10.4)

Posted on Aug 4, 2015 12:28 AM

Reply
4 replies

Aug 4, 2015 1:36 AM in response to theig

Some more information, if it helps.


I thought my Win7 partition was NTFS, not FAT23L as diskutil is now reporting

The Win7 partition is visible in Finder and the data is accessible and can be used and has been copied to a network drive

The Win7 partition is visible in Finder|Startup Disk and can be selected as the boot disk

Attempting to reboot from the Win7 partition eventually brings up the no bootable partition, insert a bootable disk message

Aug 4, 2015 3:58 PM in response to Eric Root

LonerT's post in this thread

Bootcamp, windows 7 not booting


solved my problem without resorting to Eric's Armageddon solution

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 thesample Q&A after the steps. The commands are single character commands (and the text in parentheses is an explanation and/or guide on the command). In step 6 you need to type the list of numbers separated by a space.

  1. Sudo gdisk /dev/disk0
  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

Windows partition lost after Yosemite Upgrade

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