Currently Being ModeratedMar 10, 2013 10:27 AM (in response to venkateshfilm)
read write error while installing.
That is often caused by serious Disk Errors such as Bad Blocks. To see whether the drive can be used again, you should Erase the drive with Security Erase, Zero all data (one click off the default) This will re-write all the blocks with Zeroes, and any found to be bad will have spare blocks used instead. This takes several hours. IF it completes without error, the drive has all good blocks again. Drives that develop Bad Blocks are more likely to fail in the next six months.
1) if i want to boot from my external hrd disk
Hold down the Option key as you start up. This uses an all-in-ROM program to slowly draw an Icon for each potentially-bootable Volume attached to your Mac. It does not load much of anything from your damaged drive.
Do not be surprised if it tells you there is a Windows Volume available. Linux uses the Windows booter.
2) i have formatted my internal hard disk,
Then the names of the files are gone. You may be able to recover some files, but Mac OS X has over 250,000 files in it, and you will have NO filenames.Mac Pro (Early 2009), Mac OS X (10.6.8), & Server, PPC, & AppleTalk Printers
Currently Being ModeratedMar 10, 2013 10:52 AM (in response to Grant Bennet-Alder)
Thank you so much for your response. THE READ WRITE ERROR was showing on DVD, as it was not able to collect the datas from the dvd properly i guess as it had so many scratches and the dvd reader makes strange sounds while reading it. When i used disk utililty to format my hard disk. It showedno error. I verified it with disk utility. So i hope the problem is with the DVD. I will install it next week with another dvd and check it.
And for booting as i checked to boot with option key, it doesnt show any bootable device. And it gets stuck with a cursor on the screen and showing nothing else. How can i access the external hard disk then any other way? To boot into Ubuntu...
can you suggest me some good free softwares that can get my data back even after re writing. Awaiting your further response.
Currently Being ModeratedMar 10, 2013 11:01 AM (in response to venkateshfilm)
You must press the Alt/Option key as the Startup Chime is sounding to get the All-in-ROM Startup Manager:Mac Pro (Early 2009), Mac OS X (10.6.8), & Server, PPC, & AppleTalk Printers
Currently Being ModeratedMar 10, 2013 11:10 AM (in response to Grant Bennet-Alder)
thanks again for showing lights on my post. I did try what you said before but it just shows only a cursor nothing else. The screen is blank. But is it possible to get into another OS like ubuntu when the internal OS is corrupted that was the doubt i had. If so then why i get only a cursor with nothing else.
Currently Being ModeratedMar 10, 2013 11:14 AM (in response to venkateshfilm)
It should be possible.
Don't you have Ubuntu-on-a-CD available?Mac Pro (Early 2009), Mac OS X (10.6.8), & Server, PPC, & AppleTalk Printers
Currently Being ModeratedMar 10, 2013 11:23 AM (in response to Grant Bennet-Alder)
i do have a cd but the problem is i have installed the Ubuntu in the hard disk which is 500 gb just for ubuntu os. I wanted to use it till i service my mac... If it should be possible then why is not showing up the boot option.. But what is an alternative way to get into ubuntu other than the option key...
Currently Being ModeratedMar 10, 2013 11:38 AM (in response to venkateshfilm)
Though i installed the ubuntu only in external hard disk i dont know how did it corrupt my internal hard disk.
Take your computer to a local PC/Mac repair shop.
When you get a college level degree in computer science, then you can install Linux on a Mac.
Mac's are NOT generic PC's and Linux installers are designed to work with those and not a Mac.
It takes a bit more know-how to install Linux on a Mac. I've done so, so I know what happened to your machine and why we can't help you as your too early in the learning curve.
You need professional level assistance.
Currently Being ModeratedMar 10, 2013 12:03 PM (in response to ds store)
thanks for your response. If you know what went wrong you could share with us so we can too know the issue and see to that it doesnt happen next time. But you have not answered to any of my queries and what happened to the internal hard disk. When i didnt even partition it.how can it be corrupted.i installed the linux only on the external drive.
and please do tell me the possiblity of using linux from my external hard drive, if its possible to boot now.
and the way to get back my data. From mac.. After some datas being rewritten on the same hard disk...
and yeah i have not done my bachelors in computer sciene but I m doing my Masters in electronics. So i think i would be able grasp atleast something you explain
thanks in advance
Currently Being ModeratedMar 10, 2013 12:10 PM (in response to venkateshfilm)
It may not be your OS X DVD install disc that is bad but the actual Superdrive is failing and that is why you are getting Read/Write errors from it. The first thing I'd try is to connect an external DVD drive to the system, any will work that connect by USB port (it does not have to sold by or have the Apple name on it to work with your Mac) and try using your OS X install disc to boot up the system.
You can get an external DVD drive at any local electronics store for around $30US+/-. So try that first.
Good Luck & Best Wishes.
Currently Being ModeratedMar 10, 2013 12:21 PM (in response to Shootist007)
thanks for your reply. But i used the DVD drive to write many disk just last night for my ubuntu installation. Yeah as you said there can be a possiblity of it may be i will try to clean the super drive first. Then i will try what next to do. But what still puzzles me is how my internal drive is corrupted by installing unix insp external disk couldnt get a solution for it yet....
You have any idea how to recove my datas even after overwriting any software can do it?? In mac...
Currently Being ModeratedMar 10, 2013 12:30 PM (in response to venkateshfilm)
So you wrote many discs last night and today it can't read from one disc. That to me sounds like the drive may of failed in some way.
Have you tried to read any of the discs you wrote last night? Do they come up at all? If not then it is the drive.
Any drive can fail at any time. Just because it worked yesterday or a few minutes ago does not mean it has not failed now.
Well there may only be one reason your internal disk got corrupted. You did not install whatever unix to the external drive but to your internal and wiped out and or corrupted the internal drive and that is why OS X is not booting.
Currently Being ModeratedMar 10, 2013 12:35 PM (in response to venkateshfilm)
If you want to recover your data, I suggest you stop using the computer any further and let a professional take a look at your situation.
When Linux formats a drive or partiton it will erase everyting so it can't be recovered as it does a deep format.
If you say you tried installing on a extenral drive is true, then it might have only overwritten that drive and messed up the hidden EFI partition on your Mac.
Your data might still be recoverable on the Macintosh HD partition if it was formatted with Disk Utility because it does a quick format and not a long format like Linux does.
However to do data recovery requires another computer or a external OS X boot drive with $100 software installed to see if it will work.
Then after that will require someone talented to fix your corrupted hidden EFI partiton (and anything else) to get your machine back in order once again.
If you don't want to lose your data, I suggest you get a professional and explain what occured and you need data recovery efforts, they will know what to do.
No regulars around here installs Linux on a Mac, so they don't know, nor can assist you.
I'm not there and I can't teach you how to fix things as it's too involved and complicated over this forum method, may require special software I can't recommend or know will work with your version of OS X.
So shutdown the machine and get local help.
Currently Being ModeratedMar 10, 2013 12:40 PM (in response to ds store)
thanks a lot.. It sounds pretty valid.., but i am pretty sure that i installed only in external disk as i could see the unix datas in installed.. When i opened the disk util.... With the boot dvd of mac.... So i l take the system to a specialist.. So you say the datas cannot be used unless i use some costly softwares... But i have seen some freewares which claim can do the same thing but i have not tried it though...
I Will keep the post updated.... Thanks a lot for your respons.
Currently Being ModeratedMar 10, 2013 12:42 PM (in response to Shootist007)
HI but am pretty sure i did it only in my external as i checked even the datas i installed... And yeah i will post the real problem after i find the solution of it ... Anyway thanks for your time to guide me along
have a great day....