Q: Bootcamp Windows 7 not working after Yosemite install

This is a very non-standard procedure for a OS X+Bootcamp drives. 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).

Rebuild GPT2 and GPT3 using start/end offsets

1. Sudo gdisk /dev/rdisk0
2. P  (print the full list of parts)
3. D  (delete)
4. 2  (part 2)
5. D (delete)
6. 3  (part 3)
7. N  (new part)
8. 2  (part 2)
9. 409640 - Start offset in bytes  (start point for OS X)
10. +332169175 (Size offset as opposed to End offset)
11. AF (HFS+ Partition Type)
12. N (New Part)
13. 3 (Part 3)
14. 332578816 (Start offset in bytes  (start point for NTFS
15. +157655033 (size of NTFS partition)
16. 0700    (Windows part type)
17. P  (print list of all parts just to see what changes will be made)
18. W (Write partitions).
19. Y (Yes!)

  This will delete and re-write the GPT partition info for /dev/disk0s2 and /dev/disk0s3.

Reboot and check if you can see files in the Bootcamp partition using Finder. If you can see files, the next step would be to create a Hybrid MBR to boot Windows.

Please reboot. Be aware that we have modified OS X parts, so it may not boot properly. If it does, check if you can see the Bootcamp in Finder. If you cannot boot, then you need to use OS X: About OS X Recovery - Apple Support to re-install OS X. Please ensure that you choose the current GPT2 and do not modify any other partitions. Do not erase the disk.

1. Can you see all your files in Finder?

2. Yes, you do need to recreate the Hybrid MBR. Yours is a special case, so the standard 2 3 4 will not work. You have only 2 and 3. Part 3 (GPT3=MBR3) should be marked bootable.

I am optimistic, it will work. At least you can get all your files, if necessary. I am on the US East coast, and will be gone for a few hours of shut-eye.

I will wait, if you are going to try it now. My suggestion to is to remove personal information from screen shots.

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 6. Accept all other defaults that Gdisk offers.

1. Sudo gdisk /dev/disk0
2. P  (Print list of parts)
3. R   (Recover)
4. H (chooses Hybrid)
5. Partitions numbers to be hybridized: 2 3
6. Y (Good for GRUB question)
7. N (part 2 boot flag)
8. Y  (part 3 boot flag make NTFS bootable partition)
9. W  (Write the new MBR)
10. Y    (Yes! write the new MBR)
11. Reboot

This is a special case.

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 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.

You missed step 4. (the 'h' command). Accept the default MBR hex codes.