I had Windows 7 installed via Bootcamp but I messed things up when I tried to install Ubuntu as a third OS. Now my goal is to go back to OS X and Windows 7/8.1 dual boot. However, when I go to Boot Camp Assistant I get the following message when I select the disk where I need to install Windows.
This disk is your os x startup disk and appears to have been
partitioned by another utility.
How can I re-install Windows 7 via Boot Camp Assistant?
The following may be useful:
sudo gpt -r -vv show disk0
gpt show: disk0: mediasize=120034123776; sectorsize=512; blocks=234441648
gpt show: disk0: PMBR at sector 0
gpt show: disk0: Pri GPT at sector 1
gpt show: disk0: Sec GPT at sector 234441647
start size index contents
0 1 PMBR
1 1 Pri GPT header
2 32 Pri GPT table
34 6
40 409600 1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
409640 162535816 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC
162945456 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
164214992 1840
164216832 3817472 4 GPT part - 0657FD6D-A4AB-43C4-84E5-0933C84B4F4F
168034304 66407311
234441615 32 Sec GPT table
234441647 1 Sec GPT header
sudo fdisk /dev/disk0
Disk: /dev/disk0 geometry: 14593/255/63 [234441648 sectors]
Signature: 0xAA55
Starting Ending
#: id cyl hd sec - cyl hd sec [ start - size]
------------------------------------------------------------------------
1: EE 1023 254 63 - 1023 254 63 [ 1 - 234441647] <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: 00 0 0 0 - 0 0 0 [ 0 - 0] unused
I have a mid 2010 13" MacBookPro running 10.9.2
Best Answer
Yah disk utility is bound and determined to not let you (or itself) potentially erase any more data, especially if it sees the signature of another disk partitioning utility. Welcome to the Wonderful World of Macintosh Computing... sigh.
Probably your best bet is to back up your Mac and Windows data (if not already) and boot the Mac from the COMMAND-R keyboard shortcut and wipe and reinstall from scratch. Your Ubuntu installer has gone and done some things to the partition table that Apple doesn't like and it is likely not going to be recoverable easily.
You could likely haunt the Ubuntu forums as I am sure this has been done and CAN be done. Heck there might even be someone around these parts with that experience. But if you need the Mac back up and running ASAP the quickest way might just be to repartition and start from scratch.