How can I reinstall Boot Camp using an existing Windows partition?
Can I bring back the Windows option in the Boot Camp menu, using an existing Windows installation but a reinstalled OS X?
Here’s what I did:
- Bought a MBA mid-2012.
- Installed Windows 2012 using the standard Boot Camp procedure. It worked well.
- Reinstalled OS X Yosemite by removing the OS X main partition, recreating it and doing the standard OS X setup.
Now:
- OS X works well.
- The Windows partition seems unharmed: I can browse through all system and user files in Finder.
- Pressing alt while booting brings up an OS menu, with only OS X as an option. Previously it would also show Windows.
- When I launch Boot Camp Assistant, I only get three options: create an install disk / download support software / remove Windows.
I want to have Windows as a boot option again, using the installation that is still on my hard disk. I suspect it should be possible, but searching the forums for ‘reinstall Boot Camp menu’ I couldn’t find a way how.
In case it helps, here is my fdisk output:
$ sudo fdisk /dev/disk0
Password:
Disk: /dev/disk0 geometry: 30515/255/63 [490234752 sectors]
Signature: 0xAA55
Starting Ending
#: id cyl hd sec - cyl hd sec [ start - size]
------------------------------------------------------------------------
1: EE 1023 254 63 - 1023 254 63 [ 1 - 409639] <Unknown ID>
2: AC 1023 254 63 - 1023 254 63 [ 409640 - 406526136] <Unknown ID>
3: AB 1023 254 63 - 1023 254 63 [ 406935776 - 1269536] Darwin Boot
4: 0C 1023 254 63 - 1023 254 63 [ 408205312 - 82028544] Win95 FAT32L
MacBook Air, OS X Yosemite (10.10.4), FileVault, Windows 2012