Boot Windows 7 is missing when reinstalled Mavericks

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Level 1

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Boot Windows 7 is missing when reinstalled Mavericks

Hi, Experts.

I was running OS X 10.9 Mavericks and Windows 7.

I got problem to enter Mavericks, Then I reinstalled Mavericks. When I boot up by using hold Alt, the Windows 7 option is gone!

When I enter OS X Mavericks, there is windows 7 disk and all files are in it.

I find the method from Loner T.

Repairing Boot Camp after creating new partition

sudo fdisk -e /dev/disk0

p

setpid 4

07

flag 4

p

write

y

When I restart my Macbook and hold Alt, there is windows 7 option.

when I enter Windows 7, there is only a black screen with a blinking underscore "_".

I am wondering if Loner T could tell me how to boot Windows 7? Thank you very Much.

MacBook Pro, OS X Mavericks (10.9.5), Windows 7

Posted on Sep 30, 2015 1:02 AM

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Answer 1

Loner T

Level 9

59,513 points

Sep 30, 2015 4:37 AM in response to clarusen

Can you post the output of the following Terminal commands? Let us look at your partition table.

diskutil list

diskutil cs list

sudo gpt -vv -r show /dev/disk0

sudo fdisk /dev/disk0

The "sudo" commands will prompt for your password, and it will not be echoed back. You may also see a warning about improper use of "sudo" and potential data loss due to "abuse" of the command.

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Answer 2

clarusen Author

Level 1

0 points

Sep 30, 2015 11:39 AM in response to Loner T

Hi, Loner T

Thanks for your reply.

diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *320.1 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_HFS Macintosh HD 299.0 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

4: Microsoft Basic Data Windows 7 20.2 GB disk0s4

diskutil cs list

No CoreStorage logical volume groups found

sudo gpt -vv -r show /dev/disk0

Password:

gpt show: /dev/disk0: mediasize=320072933376; sectorsize=512; blocks=625142448

gpt show: /dev/disk0: Suspicious MBR at sector 0

gpt show: /dev/disk0: Malformed MBR at sector 0

gpt show: /dev/disk0: Pri GPT at sector 1

gpt show: /dev/disk0: Sec GPT at sector 625142447

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 583984384 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC

584394024 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

585663560 952

585664512 39477248 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

625141760 655

625142415 32 Sec GPT table

625142447 1 Sec GPT header

sudo fdisk /dev/disk0

Disk: /dev/disk0 geometry: 38913/255/63 [625142448 sectors]

Signature: 0xAA55

Starting Ending

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

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

1: EE 1023 254 63 - 1023 254 63 [ 1 - 625142447] <Unknown ID>

2: 00 0 0 0 - 0 0 0 [ 0 - 0] unused

3: 00 0 0 0 - 0 0 0 [ 0 - 0] unused

*4: 07 0 0 0 - 0 0 0 [ 0 - 0] HPFS/QNX/AUX

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Answer 3

Loner T

Level 9

59,513 points

Sep 30, 2015 12:37 PM in response to clarusen

Can you post the output of

sudo dd if=/dev/rdisk0s4 count=1 2>/dev/null | hexdump -C

The 20G may be too small for Windows.

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Answer 4

clarusen Author

Level 1

0 points

Sep 30, 2015 2:59 PM in response to Loner T

Hi, Loner T,

Yes,

I only use Windows 7 for business documents. So 20G is just fine. Usually there is 1G free left. Thanks

00000000 eb 52 90 4e 54 46 53 20 20 20 20 00 02 08 00 00 |.R.NTFS .....|

00000010 00 00 00 00 00 f8 00 00 3f 00 ff 00 00 88 e8 22 |........?......"|

00000020 00 00 00 00 80 00 80 00 ff 5f 5a 02 00 00 00 00 |........._Z.....|

00000030 00 00 0c 00 00 00 00 00 02 00 00 00 00 00 00 00 |................|

00000040 f6 00 00 00 01 00 00 00 f4 6c e0 d0 a3 e0 d0 f4 |.........l......|

00000050 00 00 00 00 fa 33 c0 8e d0 bc 00 7c fb 68 c0 07 |.....3.....|.h..|

00000060 1f 1e 68 66 00 cb 88 16 0e 00 66 81 3e 03 00 4e |..hf......f.>..N|

00000070 54 46 53 75 15 b4 41 bb aa 55 cd 13 72 0c 81 fb |TFSu..A..U..r...|

00000080 55 aa 75 06 f7 c1 01 00 75 03 e9 dd 00 1e 83 ec |U.u.....u.......|

00000090 18 68 1a 00 b4 48 8a 16 0e 00 8b f4 16 1f cd 13 |.h...H..........|

000000a0 9f 83 c4 18 9e 58 1f 72 e1 3b 06 0b 00 75 db a3 |.....X.r.;...u..|

000000b0 0f 00 c1 2e 0f 00 04 1e 5a 33 db b9 00 20 2b c8 |........Z3... +.|

000000c0 66 ff 06 11 00 03 16 0f 00 8e c2 ff 06 16 00 e8 |f...............|

000000d0 4b 00 2b c8 77 ef b8 00 bb cd 1a 66 23 c0 75 2d |K.+.w......f#.u-|

000000e0 66 81 fb 54 43 50 41 75 24 81 f9 02 01 72 1e 16 |f..TCPAu$....r..|

000000f0 68 07 bb 16 68 70 0e 16 68 09 00 66 53 66 53 66 |h...hp..h..fSfSf|

00000100 55 16 16 16 68 b8 01 66 61 0e 07 cd 1a 33 c0 bf |U...h..fa....3..|

00000110 28 10 b9 d8 0f fc f3 aa e9 5f 01 90 90 66 60 1e |(........_...f`.|

00000120 06 66 a1 11 00 66 03 06 1c 00 1e 66 68 00 00 00 |.f...f.....fh...|

00000130 00 66 50 06 53 68 01 00 68 10 00 b4 42 8a 16 0e |.fP.Sh..h...B...|

00000140 00 16 1f 8b f4 cd 13 66 59 5b 5a 66 59 66 59 1f |.......fY[ZfYfY.|

00000150 0f 82 16 00 66 ff 06 11 00 03 16 0f 00 8e c2 ff |....f...........|

00000160 0e 16 00 75 bc 07 1f 66 61 c3 a0 f8 01 e8 09 00 |...u...fa.......|

00000170 a0 fb 01 e8 03 00 f4 eb fd b4 01 8b f0 ac 3c 00 |..............<.|

00000180 74 09 b4 0e bb 07 00 cd 10 eb f2 c3 0d 0a 41 20 |t.............A |

00000190 64 69 73 6b 20 72 65 61 64 20 65 72 72 6f 72 20 |disk read error |

000001a0 6f 63 63 75 72 72 65 64 00 0d 0a 42 4f 4f 54 4d |occurred...BOOTM|

000001b0 47 52 20 69 73 20 6d 69 73 73 69 6e 67 00 0d 0a |GR is missing...|

000001c0 42 4f 4f 54 4d 47 52 20 69 73 20 63 6f 6d 70 72 |BOOTMGR is compr|

000001d0 65 73 73 65 64 00 0d 0a 50 72 65 73 73 20 43 74 |essed...Press Ct|

000001e0 72 6c 2b 41 6c 74 2b 44 65 6c 20 74 6f 20 72 65 |rl+Alt+Del to re|

000001f0 73 74 61 72 74 0d 0a 00 8c a9 be d6 00 00 55 aa |start.........U.|

00000200

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Answer 5

Loner T

Level 9

59,513 points

Sep 30, 2015 11:53 PM in response to clarusen

When OS X was re-installed, it overwrote the MBR. Your Fdisk steps just created a partial entry. Can you download GPT Fdisk (http://sourceforge.net/projects/gptfdisk/) and run the following steps and test?

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 10. Accept all other defaults that Gdisk offers. Please see thesample Q&A as an example. These steps can be repeated if you make a mistake before you get to Step 12, otherwise start from Step 1 for these steps. Step 6 has numbers which are typed with a space between the numbers. Please see the sample Q&A before you execute these steps.

Sudo gdisk /dev/rdisk0
P (Print list of parts)
R (Recover)
O (print current Hybrid MBR)
H (chooses Hybrid)
Partitions numbers to be hybridized: 2 3 4
Y (Good for GRUB question)
N (part 2 boot flag)
N (part 3 boot flag)
Y (part 4 boot flag make NTFS bootable partition)
O (print current Hybrid MBR)
W (Write the new MBR)
Y (Yes! write the new MBR)
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

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.

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Answer 6

clarusen Author

Level 1

0 points

Sep 30, 2015 7:55 PM in response to Loner T

Hi, Loner T

I download gdisk and double click. The PC shows that the gdisk.pkg can't be opened because it is from an unidentified developer. Could you tell me how to open gdisk?

cheers

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