Hard drive halved after installing os x mavericks

I updated a macbook pro to mavericks from mountain lion and when it was done my data was gone and the hard drive is now only 250 GB instead of 500GB
Please help. how can i get my data back and what happed to the hhd
thx in advance

I had the same problem when I installed Leopard. I re-partitioned and re-formatted the drive and everything has been happy since. I know Leopard and Time Machine do some new, low-level things to external hard drives so it may be that the file system really is corrupt but it doesn't bother any other systems.
I don't if any 3rd party disk repair tools could repair the drive. Such tools aren't much cheaper than a new drive anyway. Plus, hard drives aren't as reliable as they used to be. It is always good to have a new external drive on deck these days.

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Hard drive unusable after installing in powered on MBP

Hey all,
I have a 2010 13'' MBP that has a 250GB hard drive, and recently I had a chance to upgrade to a 2010 15'' model. Since the previous owner planned to move his HDD out of the Mac, I would have to install my own HDD. I've nearly filled the drive to capacity, so I decided to upgrade to a bigger hard drive, and then put that in the bigger MBP. I got a 320GB laptop drive, performed a fresh install of Mavericks on it, and during the initial run with Setup Assistant I migrated everything off of the 250 to the new drive. After the setup was complete, I booted into the fresh install with my data to ensure everything was working, and it appeared that it was fine. I then shut off the machine, and disconnected the 320GB from the Mac.
I opened up the 15'' MBP, removed the prior owner's HDD, and replaced it with my new 320GB HDD. What I didn't know was that the MBP was still powered on: it was simply in sleep mode with the lid closed. I hadn't thought to check to ensure that the Mac was off before I did the drive replacement.
As a result, when I opened the lid on the Macbook, the machine woke up, and was still displaying his desktop and open applications. I quickly closed out of all the applications and shut the laptop off. When I rebooted, it was as I feared: the machine went straight to the OS X Utilities menu, and when I attempted to repair the drive in Disk Utility, I was warned that the drive couldn't be repaired. The drive also did not appear with the Mac partition in Disk Utility: it was just displayed as disk0s2.
I've tried repairing the drive with Disk Utility, Disk Warrior, and Drive Genius, and none of them have been able to recover/repair the parition. Is it possible that when I replaced the hard drive while the MBP was still powered on, the current session somehow damaged the hard drive's partition or file table?

Based on your description, you closed applications that were opened with another drive. This would certainly seem to have the potential to really screw things up. Given the situation, it probably would have been better to hold down the power key and do a hard shutdown to prevent writing anything to the wrong disk.
Why not just reinstall? You've tried pretty much everything else. Repartition and reformat your drive first, then migrate from the old one.

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It seems that Sonnet is not yet compatible with Snow Leopard either. That issue was covered here: http://discussions.apple.com/thread.jspa?threadID=2114442&tstart=0.
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What is your operating system & version?
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Where has the hard drive gone after installing lion?, where has the hard drive gone after installing lion?

I'm looking in finder but can no longer see the hard drive. Where has it gone to?

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under the "General" tab tick the boxes of the things you want to be shown on the desktop.
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if thats the case then it most likelyt is a hardware issue and not a problem with os 10.4 it might be worth your while to make sure though and find someone with a 10.2 or 10.3 disc an see if its listed in that setup, or you could check to see if that hardrive is visable in another computer that would at least rule out the possibility of the harddrive malfunctioning, but you may7 just also want to try another harddrive bay it could just be as simple as the serial cable being toast or at worst one of the buses being toast, but i believee your mac has four bays so definatly try that. and if worst comes to worst and none of these things seem to work then try calling apple.
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You can't just take that drive from the older system and install it in the new system. Even though both run Lion the Lion install on the older system does not have the correct driver set for the new hardware. In fact Apple came out with a newer version of Lion Just For these Newer System.
It may now be on the Apple servers bot it wasn't a few days, 5-12, ago..

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First Off:
Macbook 13" (late 2009) ... It was running Mountain Lion 10.8.5 with 2 gigs of memory and 160gig stock hard drive.
I started this process almost a week ago and despite numerous attempts every night I have had no luck. I appologize if the details here are fuzzy, my head is spinning after reading dozens of threads and attempting multiple solutions to each error I've received and i cant remember everything I've tried so far...
I got my new memory in the mail first, upgraded to 4 gigs and everything works fine with that..
Next came my new Seagate Momentus 750 gb 7200 rpm SATA 3gb/s 16Mb Internal Hard Drive.
Using this guide: http://osxdaily.com/2012/02/17/make-bootable-os-x-10-8-mountain-lion-usb-install -drive/ (and cross checking other guides) I ended up creating a bootable external drive using my 160gb External Firewire drive for my clean install to my new hard drive. So far so good.
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restarting of course did nothing, it repeatedly gave me error messages and made me quit installation...
Disk Utility isnt getting me anywhere, im either getting errors like:
"POSIX reports: the operation couldnt be completed. device no configured"
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"Disk Erase failed with the error: File System Formatter Failed"
and everytime the drive fails to erase or partition, it disappears from the list of drives on the left of the disk utility screen and i have to restart the computer for it to reappear for a second try. Typically the volume under the drive is greyed out and says that it is unmounted.
Ive zapped the PRAM.... and Ive done other things that I cant quite remember right now because my brain is boiling from reading too many **** threads on multiple devices....
halp.
halp me plase.

So funny story...
While writing this discussion I had to come to the computer and try to erase the drive so I could see the error code for reference. The erase didnt work as usual but I wrote the error code down here.
I also could not remember the error code for partitioning the drive so I attempted that as well so I could write down the code, and this time it magically partitioned successfully! The only thing I did differently was that I didn't rename the partition because i figured it wouldn't matter anyway. Since the partition was successful, I attempted the Reinstall of ML and it magically worked!!
I dont know what the **** happened but ive been attempting this install every night for like 3 hours since Monday and this is the first time it went through... for no apparent reason?
Ghosts? Magic? Full Moon?
we may never know...
Thanks anyways guys!

After installing OS X Mavericks on myMacBook Pro the Canon IRA 6055 printer gives me "Open error. Switch the printer off and on, and then start the print job again.: 16013" Any sugestions?

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This is the new problem
I pinged the ip address and i looks to be working
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I nstaled the lates driver package also

Hard drive halved after installing os x mavericks

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