How to reset my internal hard drive as start up drive?

Recently my Mountain Lion OS X got screwed for some unknown reason & it wouldn't boot and my Snow Leopard OS X Install DVD wouldn't finish the installation. I had access to ubuntu so I thought may be i could partition my Macintosh Hard Drive and install it in a partition and I made two partitions, one-Macintosh HD and the other- UBUNTU. And the Mount Point of my Macintosh HD changed from "/" to "/Volume/Macintosh HD". Now it wouldn't even show in 'Start Up Drive selection' and wouldn't let me install any Mac OS X saying "Mac OS X can't be installed on this system" even when I merged the partitions back. How do I change the mount point back from to "/" fro "/Volumes/Macintosh HD" and set it as my start up drive?
It would be very helpful if anyone can solve my problem. Thanks.

@Courcoul: what do you mean "repartition and reformat the internal drive to a single GUID/Apple Extended format volume" ? i have partioned the drive using SL DVD Disk Utility in the 1st place. i repartitioned it to mac extended format but no luck! also, i read in 1 of the forums that for the SL DVD to boot in my start up drive, it's mount point should be "/" and "/Volumes/Name" implies that the drive is not being detected as internal drive!
Also, i tried using terminal to create a user but it says "sudo: command not found". it showed the same for ubuntu installation. could you help me with that? I'm okay with installing either of the OS for the time being. Thanks

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How large can an internal hard drive be on a Mac Pro part #ZOD8 ?

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How to restore my internal hard drie

how to restore my internal hard drive that i erase my mistake

Ouch, if it a simple erase & not a secure erase or Zero at a, there may be hope...
using Data Rescue...
http://www.prosofteng.com/products/data_rescue.php
(Has a Free Demo to see if it could or not, but you'll need another drive to recover to).
Or professional Data Recovery Services.
BUT, every second you use that Mac the chances will be slimmer.
This one would require another HD with plenty of space to recover to.
You should use another Boot Disk or other Mac with this one in Target mode to do the recovery.
They have a free demo to see what it could recover.
rccharles on file recovery...
"Stellar Phoenix Macintosh - Mac data recovery software, recovers data from damaged, deleted, or corrupted volumes and even from initialized disks."
They have a trial version, so I guess you can see if your data can be recovered...
http://www.stellarinfo.com/mac-data-recovery.htm
FileSalvage is an extremely powerful Macintosh application for exploring and recovering deleted files from a drive or volume. FileSalvage is designed to restore files that have:
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http://subrosasoft.com/OSXSoftware/index.php?main_page=product_info&products_id= 1
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How to Backup & Partition Internal Hard Drive

I have a macbook pro 2.4ghz. I need to partition my hard drive to have a separate volume for photoshop scratch disk. How do I actually back up the drive prior to the reformatting? Do I create a bootable clone to restore the main volume.
Specific steps would be very helpful. Thanks

So, using Carbon Copy Cloner I first do a full copy of my internal drive (the one I will partition). This will copy any data files as well, correct? I then format the internal drive, creating the partition I need (making sure one is adequate to hold my back up/full copy). How do I then restore the full copy from the external drive to the internal partition? Does this include the OS or do I need to reinstall that and run for all of the updates, etc?
The basic thing to keep in mind is if you want to clone a complete, bootable copy of your drive, the +target partition+ (regardless of how big whole drive is) has to be at least as large as the items on the partition you are copying. With this mode of copying it is all or none but you need to use it to get the bootable option.
Cloning will copy your data files, OSX, OS9, updates, etc., everything. It makes a _complete, bootable duplicate_ of your internal drive when used in full copy mode. So you need to start off with the external firewire empty, or not care about anything on it because it will all get erased.
First, repair permissions on your internal and make sure it is in a healthy condition. Then use CCC as I instructed in an earlier post and clone your internal to the external. Run Disk Utility and verify the external drive just to make sure there weren't any problems while cloning. Then go into your System Preferences, Startup Drive, select OSX that should now appear on your external, and restart. This does double duty of making sure that your clone really is bootable, and you are now working off your external drive so you can work on your internal drive from the external drive (no need for startup disks). Things should look pretty much identical to how they looked when you were working off your internal except your external drive will probably be positioned in the upper right hand corner instead of your internal.
Oh, if you have like 90 GB of files this can take quite a while.
Once you have established the external drive is working you can start up Disk Utility and partition your internal drive. Unless you need me to I will have breakfast now instead of doing a blow-by-blow account of that. Just keep in mind that if a "get info" of your external drive says you have xx.xx GB of stuff then you need to make sure one of your internal partitions is at least that size. Oh, it is probably a good idea to make the first partition on your internal drive the one to which you will re-clone (if that is a word) your original drive contents; the one with the operating system.
Once you have partitioned, you run CarbonCopyCloner and again use full copy mode to copy the things on your external onto one of the internal partitions. Run verify on the internal partition just to make sure all looks good. Use Startup disk to choose the internal's copy of OSX as startup and reboot.
At this stage you have one bootable internal partition with everything that used to be on that drive, and an external drive that is bootable. I find the latter very handy because Disk Utility requires you be booted from a different drive that that which you are repairing and using startup disks is slow.
You also now have a backup of your internal drive. If you want to, in future you can use CCC in non-full mode to backup your main internal partition. It will just copy off modified files, but you can read the details in the CCC Readme.
Brian

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You may find this helpful.
https://discussions.apple.com/docs/DOC-4741
Best

How to migrate from internal hard drive to SSD (Solid State Drive)?

I just bought 128GB SSD. I want to replace my internal hard drive with SSD on MacBook Pro. My internal drive has only Mac OS installed (no dual boot with Windows/Linux). Going forward I want to boot my Mac OS from SSD and use internal drive for backup purposes only. I read many forums regarding this here, but each one talks about different methods of doing it.
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Because Windows is not involved, you don't need Casper or anything else Windows-related.
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How to upgrade my internal hard drive for macbook 5,2 from 160GB to 1TB?

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ting kwok wrote:
If I want to create a single striped RAID array, how can I do it. I know little about this. Will it clear all data even the Lion Os?
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or even from Recovery HD. You will need to make
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I didn't ask you if you thought you ordered the correct optical drive...
You opened up the machine. You made a change. Now it doesn't work. Reverse what you did and see if it works again. I'm assuming that the machine actually worked before you did this, right?

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If you normally sync to a computer, you can do the update via that and y ou don't need to have the free room to download the update.
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After formatting the new hdd, while still outside the mac, make a clone of your internal disk with CarbonCopyCloner on the new (still external) disk: CCC will ask you to install the Recovery Partition also, do that, and then the clone.
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How do i exclude internal hard drive from time machine?

I use OSX 10.7.4. My internal drive was maxed out so I copied it to an external and now I run my mac from this external drive. I want to use time machine to back up (to an additional external hard drive) but Time Machine fails because I don't have enough room. Whats happening is Time Machine wants to back up both my external drive (about 280 Gigs) and my internal (245 Gigs). I do not want or need my internal to be backed up however I cannot find a way to 'exclude it'.
In Time Machine/Options, my internal drive does not appear under devices. I have 3 external drives, (plus their partitions) but the proverbial Macintosh HD is not one of them. Even when I click the + to try and add to the devices which brings up the finder (and I check 'show hidden') still no dice.
Macintosh HD does appear in my finder.
I know one option would be to delete the contents of my internal drive, but I'm not ready to do that. I view it as my backup to my backup. It isn't updated, and it's missing things from the last few months, but in a critical failure, it might still be there.
Presumably all this is temp as I intend to replace my aging white imac with a new imac sometime this summer.
In the mean while though, I'd like time machine to do what its intended to do.
Thanks,
Bear

Open the TM preference pane, unlock it if necessary, and click Options. Click the "+" icon to add an exclusion. In the selection dialog, click the icon of your internal drive under DEVICES, then press return.

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The PowerMac3,3 version does not natively support drives larger than 128G from the logic board's drive controller. To benefit from a larger drive, you will need to install an PCI ATA controller card that supports larger drives and is (hopefully) bootable.
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[Texas Mac Man's post on large hard drives|http://discussions.apple.com/message.jspa?messageID=8646489#8646489]
[Dave Hamilton on BootROM versions and HD support|http://discussions.apple.com/thread.jspa?threadID=1751707&tstart=90]
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How to reset my internal hard drive as start up drive?

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