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

Windows will not boot

I'm panicking, I was in the final stages of prepping my old macbook and new macbook systems and ran chkdsk (not with the /B cause it complained since my system is NTFS) but I think it was right after that my bootcamp partition was not bootable (and its been many weeks since I did a backup and was just about to). It shows up in Disk Utility and hope its just a Master Boot Record or an easy fix, also can't view the bootcamp device or any files in Finder. Tried to delete the Recovery partition and EFI to get a MBR fix...I know enough to be dangerous.

Yosemite

Win 8.1

Posted on Dec 21, 2015 6:25 PM

Reply
106 replies

Dec 22, 2015 12:00 PM in response to Loner T

Last login: Tue Dec 22 11:35:05 on ttys000

larbars-MacBook-Pro-2:~ mbpro10$ Sudo gdisk /dev/rdisk0

GPT fdisk (gdisk) version 1.0.1


Warning: Devices opened with shared lock will not have their

partition table automatically reloaded!

Partition table scan:

MBR: protective

BSD: not present

APM: not present

GPT: present


Found valid GPT with protective MBR; using GPT.


Command (? for help): P

Disk /dev/rdisk0: 1953525168 sectors, 931.5 GiB

Logical sector size: 512 bytes

Disk identifier (GUID): D2FB0435-2387-4E0A-ADD4-202E476F2E42

Partition table holds up to 128 entries

First usable sector is 34, last usable sector is 1953525134

Partitions will be aligned on 8-sector boundaries

Total free space is 85044900 sectors (40.6 GiB)


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

1 40 409639 200.0 MiB EF00 EFI System Partition

2 409640 1349191639 643.1 GiB AF00 Fat 1000

3 1349453784 1350723319 619.9 MiB AF00 Apple_HFS_Untitled_2

4 1435504640 1953523704 247.0 GiB 0700 Microsoft basic data


Command (? for help): R


Recovery/transformation command (? for help): O


Disk size is 1953525168 sectors (931.5 GiB)

MBR disk identifier: 0xD5735E1B

MBR partitions:


Number Boot Start Sector End Sector Status Code

1 1 1953525167 primary 0xEE


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):

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


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

Enter an MBR hex code (default AF):

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


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

Enter an MBR hex code (default 07):

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


Recovery/transformation command (? for help): O


Disk size is 1953525168 sectors (931.5 GiB)

MBR disk identifier: 0xD5735E1B

MBR partitions:


Number Boot Start Sector End Sector Status Code

1 1 409639 primary 0xEE

2 409640 1349191639 primary 0xAF

3 1349453784 1350723319 primary 0xAF

4 * 1435504640 1953523704 primary 0x07


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/rdisk0.

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.

larbars-MacBook-Pro-2:~ mbpro10$

Dec 23, 2015 10:09 AM in response to larry Barham

From MacBook Pro (Retina, 15-inch, Mid 2015) - Technical Specifications, you have a TB2 port.

From MacBook Pro (15-inch, Mid 2010) - Technical Specifications , you have a FW800 port.


You will need http://www.apple.com/shop/product/MD464LL/A/apple-thunderbolt-to-firewire-adapte r?fnode=8b and a FW800 cable.


We are going to connect the 2015 in Target Disk Mode and erase/format your 2015 Mac internal 'disk' using diskutil commands from the 2010 Mac. If you need anything off of the 2015 Mac, please back up to an external disk.

Dec 23, 2015 10:48 AM in response to Loner T

Isn't the change from 512 to 4096 block size a performance gain? And wouldn't I want that going forward?


larbars-MacBook-Pro:refit mbpro10$ diskutil info /

Device Identifier: disk1

Device Node: /dev/disk1

Part of Whole: disk1

Device / Media Name: Macintosh HD


Volume Name: Macintosh HD


Mounted: Yes

Mount Point: /


File System Personality: Journaled HFS+

Type (Bundle): hfs

Name (User Visible): Mac OS Extended (Journaled)

Journal: Journal size 40960 KB at offset 0x1a389000

Owners: Enabled


Content (IOContent): Apple_HFS

OS Can Be Installed: Yes

Recovery Disk: disk0s4

Media Type: Generic

Protocol: PCI

SMART Status: Not Supported

Volume UUID: D8E76C10-444B-30C9-8E7C-3E2769AF1F96

Disk / Partition UUID: F6A3F197-FB62-4163-BA43-2E64E47770BE


Total Size: 499.1 GB (499055067136 Bytes) (exactly 974716928 512-Byte-Units)

Volume Free Space: 318.5 GB (318515494912 Bytes) (exactly 622100576 512-Byte-Units)

Device Block Size: 512 Bytes

Allocation Block Size: 4096 Bytes


Read-Only Media: No

Read-Only Volume: No

Ejectable: No


Whole: Yes

Internal: Yes

Solid State: Yes

OS 9 Drivers: No

Low Level Format: Not supported


This disk is a Core Storage Logical Volume (LV). Core Storage Information:

LV UUID: F6A3F197-FB62-4163-BA43-2E64E47770BE

LVF UUID: 2B9650DA-1094-4E34-8872-CFDCF795EAA0

LVG UUID: A1970066-D1B2-44C2-86F8-5240C2A9560A

Fusion Drive: No

Encrypted: No

Windows will not boot

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple ID.