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how to format the wrong formatted os ssd

Hi,


I have a macbook air 13 2011 with 128 Gb capacity. I think I made a mistake by restoring the os SSD with the time machine backup which is stored in an external disk. What I did is restart-->command+R-->disk utility-->click to choose the machitosh HD and choose restore--> using external disk containing time machine backup as source and machitosh HD as destination. After copying, I took off the external disk and restart. Now I realized it is in trouble because it can't to be booted and go to OS X utility directly.


My trial to solve this problem:

1. reinstall the OS X: failed, it said the SSD is locked.

2. go to disk utility and try to erase/partition the SSD: failed, it said "couldn't unmount the disk".

3. clike the SSD and choose unmount : failed, could not be unmounted.

4. go to the terminal and unmount the disk. I tried commande "diskutil unmount (and unmountDisk) /dev/diskls1 or 2 (I forgot the exact number), failed. It is said that "at least one of the volume can't be unmount.



I don't know what to do right now. Is there a way I can force to format the SSD and reinstall the OS? Thanks


Dan

MacBook Air, OS X Yosemite (10.10.3)

Posted on Jul 7, 2015 2:36 AM

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Question marked as Best reply

Posted on Jul 7, 2015 3:47 AM

Try this: Boot the MBA with the OPTION + COMMAND + R keys.


If successful, you should see a revolving globe.


By following the directions, you will be connected to the Apple servers.


This will allow you to erase the SSD and install the ORIGINAL OSX, Lion (10.7)


If successful, install Yosemite and then your user data from Time Machine.


A solid Internet connection will be required.


Ciao.

1 reply
Question marked as Best reply

Jul 7, 2015 3:47 AM in response to trueyahoo

Try this: Boot the MBA with the OPTION + COMMAND + R keys.


If successful, you should see a revolving globe.


By following the directions, you will be connected to the Apple servers.


This will allow you to erase the SSD and install the ORIGINAL OSX, Lion (10.7)


If successful, install Yosemite and then your user data from Time Machine.


A solid Internet connection will be required.


Ciao.

how to format the wrong formatted os ssd

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