Can't Boot Into Windows and Can't Delete Partition

RushRealSlow

macrumors newbie
Original poster
Oct 9, 2009
7
0
So one day my windows just pooped out on me. I could no longer boot into it at the log in, as the disc would never show up (only my mac OS option would show up). No big deal...I was just going to delete the partition and reinstall windows. HOWEVER when I go to boot camp assistant to delete my partition, it gives me these 2 options:

Additional software designed specifically for each Mac is required to fully support Windows. This support software installs boot camp drivers that allow your apple......

Download the Windows support software for this Mac

I have the Mac OS X installation disc that came with my Mac or I have already downloaded the Windows support software for this Mac to a CD, DVD, or external disk.

No matter what option I select, it gives me this error message:

The startup disk cannot be partitioned or restored to a single partition
Back up the disk and use Disk Utility to format it as a single Mac OS Extended (Journaled) volume. Restore your information to the disk and try using Boot Camp Assistant again. I then tried to mess around with the disc utility but I keep getting this message "Could not modify partition map"

Please help!! I don't know much about macs (which is why I run Windows) and I am really looking to get this thing resolved.
 

\-V-/

Suspended
May 3, 2012
3,155
2,619
When this happens I usually format the Windows partition as FAT32 via Disk Utility, then re-open the Boot Camp Assistant, which then allows me to merge the partitions back together again.
 

RushRealSlow

macrumors newbie
Original poster
Oct 9, 2009
7
0
In Terminal:

Code:
sudo gpt -r -vv show disk0
sudo fdisk /dev/disk0
Report the results.
This is what I got:


gpt show: disk0: mediasize=500107862016; sectorsize=512; blocks=976773168
gpt show: disk0: Suspicious MBR at sector 0
gpt show: disk0: Bad CRC in GPT table at sector 2
start size index contents
0 1 MBR
1 409639
409640 822083584 3 MBR part 175
822493224 264152
822757376 154015744 4 MBR part 7
976773120 48






When this happens I usually format the Windows partition as FAT32 via Disk Utility, then re-open the Boot Camp Assistant, which then allows me to merge the partitions back together again.
This is part of the problem. When I try to do this, I get the following error message:Could not modify partition map
 
Last edited:

murphychris

macrumors 6502a
Mar 19, 2012
661
1
This is what I got.
You did not include the results from both commands, just the first one. Please provide the results from 'sudo fdisk /dev/disk0' and highlight the pasted text, click on the # button in the forum toolbar so the results format correctly.

This problem is either the result of a botched attempt to resize the Windows partition from within Windows, using a Windows utility, or you've had a bad sector develop in which case I'd become suspicious about the disk itself.

You will ultimately need to install a copy of GPT fdisk from Sourceforge.com. Install it, then issue this command, post the results, and use the # button in the forum toolbar to correctly format the results.

Code:
sudo gdisk -l /dev/disk0
NOTE: That is a lowercase L not the number one.