Cant enter mac os when pressing option at start after hiding mac partition in newly installed win7

I used boot camp to install windows 7 ultimate yesterday. After that I use some partition tool to hide the mac partition simply because I dont wanna carelessly take something out or put something in the partition. After that, I can never see mac os option on start again when pressing option button. This really made me upset cuz I got lot of important stuff on mac os. Can anyone help?

Well, you hid it, didn't you. When you hide something, how would you see it?
You probably can unhide it, with the same tool that you used to hide it (I hope for you that it is a Windows tool).
Eventually when you have back the Mac Partition, you should set the Windows Partition to be the default Boot Disk. Then you do not need to "hide" the mac partition.

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Hi everyone,
I'm new to mac and recently bought a MBP.
I did bootcamp and installed windows xp and SP3 at the same time in a small partition, I remember it was 8gb.
I had no problem booting in to xp or mac after the installation, I can even press option and see both OS.
But now I cannot boot to windows, at startup while pressing the option key, I only see mac os and not windows. I also tried rebooting from the startup disk utility, but it has a black screen saying "no bootable disk found." It wants me to insert a bootable disk, so I inserted the window xp disk and has to force restart the laptop. Then it started a process like trying to load the files to reinstall win xp, of course I didn't let it.
Now when I went back to disk utilities I see that the winxp partition is 9.2gb, it was 8gb when I made it.
Recently I split my mac partition into 2, I tried to do the time machine back up, but then it takes too long so I canceled it and deleted the partition. I wonder if this affects my window xp partition.
Now I cannot see winxp when pressing option key at startup, but can see it in startup disk utility, and disk utility. When I boot from startup disk utility, it shows "no bootable device, insert cd, and press anykey..." I tried verifying and repairing the parition in disk utility, didn't work.
So this is all I did before I cannot boot into xp.
1. made new partition for winxp (formated partition as FAT)in bootcamp and installed winxp + sp3. everything was fine.
2. create another partition, and call it "data" <-want to create this for data only, while the other half is for software installation only.
3. create another partition for time machine, but when running time machine it says the partition is too small, so I delete it and make the partition bigger.then I run time machine, but since it takes way too long, I canceled it, and deleted the partition.
4. in winxp, had installed kapersky anti-virus 9.0
Now, I have 3 partitions: 1 for software installation, 1 for data, and 1 for winxp.
So why can't I boot to windows? Did things overwrite? Please help me, I'm so frustrated. Thank you.
Message was edited by: nobutan
Message was edited by: nobutan

Thanks fortuny,
I had read the link you suggested. And since my partition for windows is FAT32, as noted in the website, I can edit the boot.ini directly in my mac. In my mac, it already shows that the partition # is 3,
[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(3)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(2)\WINDOWS="Microsoft Windows XP Professional" /NOEXECUTE=OPTIN/fastdect
but my window os is not booting.
Like the link noted, "it crashes with the "I'm sorry, we couldn't start up Windows. Do you want to start in Safe Mode?" screen. You'll also see a flicker of the BLUE SCREEN OF DEATH, which flashes an UNMOUNTABLEBOOTVOLUME error so quickly you won't have a chance to read it. This was the hint that the BOOT.INI entries were incorrect..."
According to the boot.ini in the site, my boot.ini file was already set up correctly, so why can't windows startup?
Also something I don't understand from this:
"NOTES: If you didn't follow the instructions and chose to PARTITION the existing volume instead of RESIZING then ADDING a partition, this appears to mess up BootCamp's boot loader and you may have to start again. Step 3, however, may offer you a way out."
When I did the 3rd partition, I did it in Disk Utility in mac, not from the mac os cd, and I split the mac partition into 2, I didn't do the "resizing," then using the unused space to make new partition... I wonder if this is causing the normal booting...
So do I start again by deleting my data partition or start from reinstalling windows? If the problem can be fixed without installing windows, of course, it would be great.
Message was edited by: nobutan

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~~~~~~~~~~~~~
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~~~~~~~~~~~~~
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here you go:
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Well, "Media" is the name of the drive. You must now partition and reformat it in order to create a new volume:
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Boot to the Internet Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND-OPTION- R keys until a globe appears on the screen. Wait patiently - 15-20 minutes - until the Recovery main menu appears.
Partition and Format the hard drive:
Select Disk Utility from the main menu and click on the Continue button.
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Reinstall OS X: Select Reinstall OS X and click on the Install button. Be sure to select the correct drive to use if you have more than one.
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Install Mavericks, Lion/Mountain Lion From Scratch
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Internet Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND- R keys until the Recovery main menu appears.
Partition and Format the hard drive:
Select Disk Utility from the main menu and click on the Continue button.
After DU loads select your newly installed hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed. Quit DU and return to the main menu.
Reinstall Lion/Mountain Lion. Mavericks: Select Reinstall Lion/Mountain Lion, Mavericks and click on the Install button. Be sure to select the correct drive to use if you have more than one.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
I've never done this myself in this way. However, in theory it should work. If it does not, then you must use a Full Internet Recovery process as follows:
Install Mavericks, Lion/Mountain Lion Using Internet Recovery
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Internet Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND-OPTION- R keys until a globe appears on the screen. Wait patiently - 15-20 minutes - until the Recovery main menu appears.
Partition and Format the hard drive:
Select Disk Utility from the main menu and click on the Continue button.
After DU loads select your newly installed hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed. Quit DU and return to the main menu.
Reinstall Lion/Mountain Lion. Mavericks: Select Reinstall Lion/Mountain Lion, Mavericks and click on the Install button. Be sure to select the correct drive to use if you have more than one.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.

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Hello,
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Install Mavericks, Lion/Mountain Lion Using Internet Recovery
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Internet Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND-OPTION- R keys until a globe appears on the screen. Wait patiently - 15-20 minutes - until the Recovery main menu appears.
Partition and Format the hard drive:
Select Disk Utility from the main menu and click on the Continue button.
After DU loads select your newly installed hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed. Quit DU and return to the main menu.
Reinstall Lion/Mountain Lion. Mavericks: Select Reinstall Lion/Mountain Lion, Mavericks and click on the Install button. Be sure to select the correct drive to use if you have more than one.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
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Cant enter mac os when pressing option at start after hiding mac partition in newly installed win7

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