Bootcamp partition missing when updating windows

Can you post the output of

diskutil list

diskutil cs list

sudo gpt -vv -r show /dev/disk0

sudo fdisk /dev/disk0

This will get recorded here, for any future reference.

Were you updating W7 to Windows 10? The 20Kb disk0s4 shows that it did exist but was overwritten. The strangest part is the MBR has MBR 2 and 3 marked as bootable. Were there any attempts made to correct the MBR through some utility?

thomasds20 wrote:

Please help to solve this problem.

This is a list of unrecoverable partitions. If you notice the end of these entries is beyond the physical number of sectors on the disk.

Press Enter to Continue. This will show you a list of viable and recoverable partitions.

You have two separate issues.

1. Your entire disk was converted from a GUID Partition Table (GPT) disk to an MBR Disk as shown in your GPT output where the line 0: says 'Fdisk_partition_scheme'. On a Mac with a single-disk, disk0 should always be a GPT disk. Your disk utility screen shot confirms it and shows the disk as an MBR disk.

2. Your Windows partition seems to be buried somewhere. If you ran Testdisk using EFI/GPT, you may not get correct results. We should first correct the GPT and make it a GPT disk with a Hybrid MBR.

Please try and remember the exact sequence of events as it happened. It will provide information that will help recovery.

1. Did you boot in Windows 7 and then execute a Windows 10 update or did you use BC Assistant to create a Windows 10 installation disk and try to reinstall W10?

2. Did the W10 upgrade ask you to change/modify any partitions?

3. Did you get any black screens before the Mac crashed?

4. Are you trying to upgrade from W7 32-bit to W10 32-bit?

5. What is the exact year/model of your Mac? Please do not post the serial number of your Mac.

6. What is the version of OS X you are currently running?

7. Is your Mac list in Use Windows 10 on your Mac with Boot Camp - Apple Support as a qualified Mac for Windows 10?

Can you backup your OS X installation to Time Machine (or any other tool of your choice)? Once you have a backup, we should erase your internal disk.

If you want to preserve W7, we should use GPT Fdisk, and convert your disk to a GPT.

1. Back up OSX using Time Machine - Mac Basics: Time Machine backs up your Mac - Apple Support.

2. Boot into Internet Recovery - OS X: About OS X Recovery - Apple Support.

3. Erase your internal drive and restore from the TM backup in Step 1 - OS X Yosemite: Recover your entire system.

Please be aware that TM does not backup Bootcamp partitions.

If you run into any issues, please post back, and we can take a look at the issues.

Hi Loner,

I have upgraded to Yosemite and not seeing my Bootcamp harddrive. Please see the output of the commands mentioned above. I have created a bootable usb for my macbook pro (early 2011) but don't see any of the bootcamp partition and usb drive when I press "Option" during "reboot".

diskutil list

diskutil cs list

sudo gpt -vv -r show /dev/disk0

sudo fdisk /dev/disk0

Praveens-MacBook-Pro:~ praveentunki$ 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_CoreStorage 61.2 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

4: Microsoft Basic Data BOOTCAMP 258.0 GB disk0s4

/dev/disk1

#: TYPE NAME SIZE IDENTIFIER

0: Apple_HFS Untitled *60.8 GB disk1

Logical Volume on disk0s2

D433BBCF-9090-4AC0-98B6-074ED6293C06

Unencrypted

Praveens-MacBook-Pro:~ praveentunki$ diskutil cs list

CoreStorage logical volume groups (1 found)

|

+-- Logical Volume Group F7C9BFB5-7DE6-40B1-9CE3-CAB3E38B4A8E

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

Name: Untitled

Status: Online

Size: 61213179904 B (61.2 GB)

Free Space: 18907136 B (18.9 MB)

|

+-< Physical Volume 53423A01-34D5-4831-9F22-931CA2F862C0

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

| Index: 0

| Disk: disk0s2

| Status: Online

| Size: 61213179904 B (61.2 GB)

|

+-> Logical Volume Family D01FAEA2-7440-46CD-BCB1-4D63C4058B73

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

Encryption Status: Unlocked

Encryption Type: None

Conversion Status: NoConversion

Conversion Direction: -none-

Has Encrypted Extents: No

Fully Secure: No

Passphrase Required: No

|

+-> Logical Volume D433BBCF-9090-4AC0-98B6-074ED6293C06

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

Disk: disk1

Status: Online

Size (Total): 60841951232 B (60.8 GB)

Conversion Progress: -none-

Revertible: Yes (no decryption required)

LV Name: Untitled

Volume Name: Untitled

Content Hint: Apple_HFS

Praveens-MacBook-Pro:~ praveentunki$ 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: 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 119556992 2 GPT part - 53746F72-6167-11AA-AA11-00306543ECAC

119966632 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

121236168 1336

121237504 503904256 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

625141760 655

625142415 32 Sec GPT table

625142447 1 Sec GPT header

Praveens-MacBook-Pro:~ praveentunki$ 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 0 0 2 - 25 127 14 [ 1 - 409639] <Unknown ID>

2: AF 25 127 15 - 1023 254 63 [ 409640 - 119556992] HFS+

3: AB 1023 254 63 - 1023 254 63 [ 119966632 - 1269536] Darwin Boot

*4: 07 1023 254 63 - 1023 254 63 [ 121237504 - 503904256] HPFS/QNX/AUX

Praveens-MacBook-Pro:~ praveentunki$

Thanks

Praveen

Can you start a new discussion and post these on the new discussion, to avoid confusion?

THank you , i have started a new discussion.

Bootcamp partition not showing up