Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.

Level 1

0 points

Bootcamp with Win' 8 won't start after Yosemite

After installing bootcamp I had to upgrade my windows partition, it worked until I upgraded to Yosemite.

After upgrading and rebooting and clicking alt the windows option didn't even appear.

I tried a couple of tips in the communitie threads and managed to get windows to appear as an option on reboot however I get the message

"missing operating system".

Following Loner T's suggestions I get these results:

diskutil list

MacBook-Pro:~ Ran$ diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *251.0 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_CoreStorage 210.0 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

4: Microsoft Basic Data 30.0 GB disk0s4

/dev/disk1

#: TYPE NAME SIZE IDENTIFIER

0: Apple_HFS Macintosh HD *209.6 GB disk1

Logical Volume on disk0s2

ADB5ED30-596D-4CBF-95B6-3147DF954E96

Unlocked Encrypted

diskutil cs list

MacBook-Pro:~ Ran$ diskutil cs list

CoreStorage logical volume groups (1 found)

+-- Logical Volume Group B8C99B8C-D7C4-4E0E-8AD3-BA68035C6584

=========================================================

Name: Macintosh HD

Status: Online

Size: 209999998976 B (210.0 GB)

Free Space: 0 B (0 B)

+-< Physical Volume 0D9669BA-EE47-4F1C-A256-BFD369F8694E

| ----------------------------------------------------

| Index: 0

| Disk: disk0s2

| Status: Online

| Size: 209999998976 B (210.0 GB)

+-> Logical Volume Family BF2FC390-7959-4AD8-A73C-6A2D1ACFD56B

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

Encryption Status: Unlocked

Encryption Type: AES-XTS

Conversion Status: Complete

Conversion Direction: -none-

Has Encrypted Extents: Yes

Fully Secure: Yes

Passphrase Required: Yes

+-> Logical Volume ADB5ED30-596D-4CBF-95B6-3147DF954E96

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

Disk: disk1

Status: Online

Size (Total): 209648091136 B (209.6 GB)

Conversion Progress: -none-

Revertible: Yes (unlock and decryption required)

LV Name: Macintosh HD

Volume Name: Macintosh HD

Content Hint: Apple_HFS

sudo gpt -vv -r show /dev/disk

MacBook-Pro:~ Ran$ sudo gpt -vv -r show /dev/disk0

gpt show: /dev/disk0: mediasize=251000193024; sectorsize=512; blocks=490234752

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 490234751

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 410156248 2 GPT part - 53746F72-6167-11AA-AA11-00306543ECAC

410565888 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

411835424 19807200

431642624 58591232 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

490233856 863

490234719 32 Sec GPT table

490234751 1 Sec GPT header

sudo fdisk /dev/disk

MacBook-Pro:~ Ran$ sudo fdisk /dev/disk0

Disk: /dev/disk0 geometry: 30515/255/63 [490234752 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: AC 1023 254 63 - 1023 254 63 [ 409640 - 410156248] <Unknown ID>

3: AB 1023 254 63 - 1023 254 63 [ 410565888 - 1269536] Darwin Boot

*4: 07 1023 254 63 - 1023 254 63 [ 431642624 - 58591232] HPFS/QNX/AUX

sudo dd if=/dev/rdisk0 count=1 2>/dev/null | hexdump -

MacBook-Pro:~ Ran$ sudo fdisk /dev/disk0

Disk: /dev/disk0 geometry: 30515/255/63 [490234752 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: AC 1023 254 63 - 1023 254 63 [ 409640 - 410156248] <Unknown ID>

3: AB 1023 254 63 - 1023 254 63 [ 410565888 - 1269536] Darwin Boot

*4: 07 1023 254 63 - 1023 254 63 [ 431642624 - 58591232] HPFS/QNX/AUX

MacBook-Pro:~ Ran$ sudo dd if=/dev/rdisk0 count=1 2>/dev/null | hexdump -C

00000000 33 c0 8e d0 bc 00 7c 8e c0 8e d8 be 00 7c bf 00 |3.....|......|..|

00000010 06 b9 00 02 fc f3 a4 50 68 1c 06 cb fb b9 04 00 |.......Ph.......|

00000020 bd be 07 80 7e 00 00 7c 0b 0f 85 0e 01 83 c5 10 |....~..|........|

00000030 e2 f1 cd 18 88 56 00 55 c6 46 11 05 c6 46 10 00 |.....V.U.F...F..|

00000040 b4 41 bb aa 55 cd 13 5d 72 0f 81 fb 55 aa 75 09 |.A..U..]r...U.u.|

00000050 f7 c1 01 00 74 03 fe 46 10 66 60 80 7e 10 00 74 |....t..F.f`.~..t|

00000060 26 66 68 00 00 00 00 66 ff 76 08 68 00 00 68 00 |&fh....f.v.h..h.|

00000070 7c 68 01 00 68 10 00 b4 42 8a 56 00 8b f4 cd 13 ||h..h...B.V.....|

00000080 9f 83 c4 10 9e eb 14 b8 01 02 bb 00 7c 8a 56 00 |............|.V.|

00000090 8a 76 01 8a 4e 02 8a 6e 03 cd 13 66 61 73 1c fe |.v..N..n...fas..|

000000a0 4e 11 75 0c 80 7e 00 80 0f 84 8a 00 b2 80 eb 84 |N.u..~..........|

000000b0 55 32 e4 8a 56 00 cd 13 5d eb 9e 81 3e fe 7d 55 |U2..V...]...>.}U|

000000c0 aa 75 6e ff 76 00 e8 8d 00 75 17 fa b0 d1 e6 64 |.un.v....u.....d|

000000d0 e8 83 00 b0 df e6 60 e8 7c 00 b0 ff e6 64 e8 75 |......`.|....d.u|

000000e0 00 fb b8 00 bb cd 1a 66 23 c0 75 3b 66 81 fb 54 |.......f#.u;f..T|

000000f0 43 50 41 75 32 81 f9 02 01 72 2c 66 68 07 bb 00 |CPAu2....r,fh...|

00000100 00 66 68 00 02 00 00 66 68 08 00 00 00 66 53 66 |.fh....fh....fSf|

00000110 53 66 55 66 68 00 00 00 00 66 68 00 7c 00 00 66 |SfUfh....fh.|..f|

00000120 61 68 00 00 07 cd 1a 5a 32 f6 ea 00 7c 00 00 cd |ah.....Z2...|...|

00000130 18 a0 b7 07 eb 08 a0 b6 07 eb 03 a0 b5 07 32 e4 |..............2.|

00000140 05 00 07 8b f0 ac 3c 00 74 09 bb 07 00 b4 0e cd |......<.t.......|

00000150 10 eb f2 f4 eb fd 2b c9 e4 64 eb 00 24 02 e0 f8 |......+..d..$...|

00000160 24 02 c3 49 6e 76 61 6c 69 64 20 70 61 72 74 69 |$..Invalid parti|

00000170 74 69 6f 6e 20 74 61 62 6c 65 00 45 72 72 6f 72 |tion table.Error|

00000180 20 6c 6f 61 64 69 6e 67 20 6f 70 65 72 61 74 69 | loading operati|

00000190 6e 67 20 73 79 73 74 65 6d 00 4d 69 73 73 69 6e |ng system.Missin|

000001a0 67 20 6f 70 65 72 61 74 69 6e 67 20 73 79 73 74 |g operating syst|

000001b0 65 6d 00 00 00 63 7b 9a 4e 8b 2f 59 00 00 00 fe |em...c{.N./Y....|

000001c0 ff ff ee fe ff ff 01 00 00 00 27 40 06 00 00 fe |..........'@....|

000001d0 ff ff ac fe ff ff 28 40 06 00 d8 7c 72 18 00 fe |......(@...|r...|

000001e0 ff ff ab fe ff ff 00 bd 78 18 20 5f 13 00 80 fe |........x. _....|

000001f0 ff ff 07 fe ff ff 00 58 ba 19 00 08 7e 03 55 aa |.......X....~.U.|

00000200

Thanks.

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

Posted on Nov 2, 2014 2:05 PM

24 replies

Loner T

Level 9

59,477 points

Nov 5, 2014 4:04 AM in response to Venia77

Fantastic. Yosemite moved your partitions but the partition headers were calculated incorrectly. Based on what you have found via Testdisk, this table should show the correct placement of where the NTFS start should be. If the Byte Offset was negative you would lose Recovery HD.

GPT 3 Start	GPT 3 Size	GPT 3 End	NTFS Start	Byte Offset
410565888	1269536	411835424	411836416	992

The next steps are (please stop if you see any error messages other than a read-only disk warning).

1. Delete the old GPT 4 entry and create a new entry at GPT 4 using the start/end you found via Testdisk.

sudo gdisk /dev/disk0

411836416

490233848

0700

Here is an example...

Command (? for help): d

Partition number (1-4): 4

Command (? for help): n

Partition number (4-128, default 4): 4

First sector (34-1954210086, default = 1454210080) or {+-}size{KMGTP}: 1454211072

Last sector (1454211072-1954210086, default = 1954210086) or {+-}size{KMGTP}: 1954209791

Current type is 'Apple HFS/HFS+'

Hex code or GUID (L to show codes, Enter = AF00): 0700

Changed type of partition to 'Microsoft basic data'

Command (? for help): p

Disk /dev/disk0: 1954210120 sectors, 931.8 GiB

Logical sector size: 512 bytes

Disk identifier (GUID): 6ED0C429-00D1-4759-B50E-04B6FB80D0E3

Partition table holds up to 128 entries

First usable sector is 34, last usable sector is 1954210086

Partitions will be aligned on 8-sector boundaries

Total free space is 1293 sectors (646.5 KiB)

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

1 40 409639 200.0 MiB EF00 EFI System Partition

2 409640 1452940543 692.6 GiB AF00 Customer

3 1452940544 1454210079 619.9 MiB AB00 Recovery HD

4 1454211072 1954209791 238.4 GiB 0700 Microsoft basic data

2. You want to check after the second 'p'rint command that it looks reasonable, before the 'w'rite and 'y'es to confirm.

3. You will need to reboot after the change, because the disk you are booted from is the one being modified. Reboot will rebuild disk0s4 using the start/end you entered.

4. Run the dd command - sudo dd if=/dev/rdisk0s4 count=1 2>/dev/null | hexdump -C and check that the first line contains "R.NTFS".

5. Once you have a working GPT 4, a new hybrid MBR needs to be created which will overwrite what you see in your Fdisk output. This is also done using GPT Fdisk (Gdisk). The following is an example and the output of "p" command may differ from your specific values

sudo gdisk /dev/disk0

GPT fdisk (gdisk) version 0.8.10

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: 490234752 sectors, 233.8 GiB

Logical sector size: 512 bytes

Disk identifier (GUID): 59BDFEEB-1EB4-4529-94FE-3CBC2C3CD513

Partition table holds up to 128 entries

First usable sector is 34, last usable sector is 490234718

Partitions will be aligned on 8-sector boundaries

Total free space is 2604 sectors (1.3 MiB)

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

1 40 409639 200.0 MiB EF00 EF

2 409640 401060383 191.0 GiB AF05 Macintosh HD

3 401060384 402329919 619.9 MiB AB00 Re

4 402331648 490233848 41.9 GiB 0700 Microsoft basic data

Command (? for help): r

Recovery/transformation command (? for help): h

WARNING! Hybrid MBRs are flaky and dangerous! If you decide not to use one,

just hit the Enter key at the below prompt and your MBR partition table will

be untouched.

Type from one to three GPT partition numbers, separated by spaces, to be

added to the hybrid MBR, in sequence: 2 3 4

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): AF

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

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

Enter an MBR hex code (default AB): AB

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

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

Enter an MBR hex code (default 07): 07

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

Recovery/transformation command (? for help): w

Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING

PARTITIONS!!

Do you want to proceed? (Y/N): y

OK; writing new GUID partition table (GPT) to /dev/disk0.

Warning: Devices opened with shared lock will not have their

partition table automatically reloaded!

Warning: The kernel may continue to use old or deleted partitions.

You should reboot or remove the drive.

The operation has completed successfully.

Now Reboot and verify the output of fdisk again.

6. a. Test 1 - Can you see your Bootcamp volume in Finder.

b. Test 2 - Can you files in the Bootcamp volume?

c. Test 3 - Can you see Bootcamp in your System Preferences -> Startup Disk.

d. Test 4 - If Test 1-3 are successful, select Bootcamp and click on Restart. You may need Windows startup repair, if you see a hanging underline cursor at the top left corner of your screen. In most cases, it is not required.