That's what was suggested to me by Apple support, when I called them an hour ago, to ask about this issue (lost Windows partition, when upgrading to Maverick).
They said, go to Preferences and set your Boot Disk to Boot Camp (or whatever disk contains your Windows partition). Then perform the upgrade to Maverick. And then you can select which disk you want to boot from, by holding down the Options(Alt) key when booting. Then you can set your Boot Disk to the Maverick disk again.
I haven't tried it yet, so I can't say if it works or not.
I upgraded to Mavericks a week ago and everything seemed fine. Today I thought well, let's play I game so I tried holding down option during boot and there was no bootcamp partion among the options.
I read your reply about installing reFit which I did and then I was about to make sure my TimeMachine backup was as recent as possible by plugging in my external hard drive. However after maybe ten minutes I get a message that the back up failed becacuse there is not enough space on the drive. In the past TM used to delete the oldest files to make room for new ones but in my Mavericks installation something is strange. I thought, well, I keep this TMB and plugged in another external drive, formatted it and pointed time machine to the new empty drive and same thing happened. Not enough space it says. My Mac partiotion is 500 GB and the external hard drive is also 500 GB and the old TMB is also 500 GB and I've had no problem with it for years. Now I have no Time Machine, No Bootcamp. I am stuck. Can anyone help?
After upgrading the exFAT partition was gone - well, showing error, so unreadable
the Bootcamp partition was there, but windows couldn't boot
my solution: for windows, booting with the windows repair CD, fixing the boot section, and it is now OK
for the exFAT, going to disk utility and repairing the partition
looks like everything's ok now.
bad for Apple, shouldn't event touch other partitions.
Make sure you backup your Windows information before upgrading to Mavericks as in rare circumstances it is deleting the bootcamp partition and when that happens everything is lost. Backup, Backup, Backup...
P.s Time Machine does not backup your windows bootcamp partition, you have to use Windows Backup inside of Windows.
Many factors go towards whether or not upgrading to Mavericks will damage Bootcamp or Windows.
The main one seems to be that if any partitiion changes have been made since installing Windows in Bootcamp.
That will almost certainly cause loss or damage to the Windows installation (or at least to its booting).
Before uprading to Mavarick I changed the Bootcamp partition from 100 GB to 500 GB on the Mac Mini, with Camptune X from Paragon. After upgrading to Mavarick the system worked well. W7 in bootcamp. After this discussion I controlled to day the size of Bootcamp and it is still 500GB.
But some weeks ago I started up in Mavarick and wanted to restart to W7, this was not anymore possible. I had to shut down Mavarick and start up with ALT - key to W7.
Did you have any issues using bootcamp to partition your sshd and installing windows? Ive recently installed a 1TB sshd in my MacBook Pro mid 2009 and I want to be aware of anything that may come up. Just started looking up some info and found your post in this group, I do not have Mavericks only ML. Hope to hear a response, thanks in advance!
Hi... I just made an upgrade on my iMac 20" (early 2009) from 10.8 to 10.9 having Windows 8 in the bootcamp partition (32-Bit !!).
you know what... everything went fine & easy !
I was very positively surprised because my iMac does not appear on the compatibilty-list for bootcamp 5
and of course not with a Windows 8 32-Bit Version !
So make a backup of everything and just try
(and no, I didn't change the size of the partitions...