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holoski

macrumors newbie
Original poster
Nov 8, 2015
10
1
Hi Guys,



I have sold my iMac and went to erase everything and reinstall Maverick. I think I made mistakes and lost my partitions. The problem is I don't get a hard drive to select when reinstalling Maverick from the web install. I attach a series of pics, I have lost my Macintosh HD drive, it is just called "internal drive" I can't make a partition. I boot into safe mode, or try to, but it won't boot up to allow me to select a volume or drive.



Please advise how I can fix. It is being collected in 5 hours :(
 

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Hi Guys,



I have sold my iMac and went to erase everything and reinstall Maverick. I think I made mistakes and lost my partitions. The problem is I don't get a hard drive to select when reinstalling Maverick from the web install. I attach a series of pics, I have lost my Macintosh HD drive, it is just called "internal drive" I can't make a partition. I boot into safe mode, or try to, but it won't boot up to allow me to select a volume or drive.



Please advise how I can fix. It is being collected in 5 hours :(
http://osxdaily.com/2014/12/14/reinstall-os-x-mac-internet-recovery/
 
thanks, I had tried that, I get to the page where you select your hard drive, but I have no drive option to select. It was fine before I erased the drive, I think I just erased the boot partition or something.
 
Did you try the "Partition" tab with Internal Drive selected? None of your screenshots down it. You can ignore disk2; it's the temporary Internet Recovery drive.
 
I get this screen, but am unable to do anything. Thanks tho.
 

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Open Terminal and type "diskutil list" and note the name of your main hard drive (probably /dev/disk1). Then do a "diskutil cs revert /dev/disk1". Disk Utility should now be able to manipulate it.
 
it is indeed dev/disk1, in that it is the largest disk (1TB) However I tried typing in "diskutil cs revert /dev/disk1" and got the message "did not recognise corestorage verb "revert/dev/disk1" ; type diskutilcorestorage" for a list

Am I typing it in the correct format ?
Screens attached. Thank you again.
 

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Someone suggested this was the problem "Your partition map is incorrect, GUID is needed, not APM (Apple Partition Map)" but no suggestion on how to remedy.
 
Last edited by a moderator:
it is indeed dev/disk1, in that it is the largest disk (1TB) However I tried typing in "diskutil cs revert /dev/disk1" and got the message "did not recognise corestorage verb "revert/dev/disk1" ; type diskutilcorestorage" for a list

Am I typing it in the correct format ?
Screens attached. Thank you again.
You've left out the space between revert and /.
 
You've left out the space between revert and /.
thanks, I had tried various formats, inc that and got this error. /dev/disk1 is not a CoreStorage Logical Volume.
 

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Thanks.

I ran diskutil cs list and get this.

I ran diskutil cs revert /dev/disk1 but it says it is not a CS Logical volume. My screenprint says I do have a core logical volume, but there is no disc number against it. Thank you for your patience.
 

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Oops, I should've had you do a "diskutil cs list", which I see you did in your latest screenshot. Instead of /dev/disk1, try copying the long hex string after "Logical Volume Group". I can't make it out in your screenshot but it looks like it's there.
 
Oops, I should've had you do a "diskutil cs list", which I see you did in your latest screenshot. Instead of /dev/disk1, try copying the long hex string after "Logical Volume Group". I can't make it out in your screenshot but it looks like it's there.

lol, no problem, I am grateful for your time. Alas, it says unable to find disc when I type diskutil cs revert /dev/long hex string. I tried with and without the space in the hex string and with and without /dev at the front.

Other research I read said to partition my internal drive, but it is all blue and doesn't let me add a drive by pressing +
 
Not /dev, just "diskutil cs revert 12345678" etc.

Edit: I should read the whole post next time...

Edit 2: After reading a few things, it looks like I may have been leading you astray. The steps that I found are for "fixing" a single drive whereas is seems that you have a Fusion setup. I don't know what to do :(
 
Hi Guys,



I have sold my iMac and went to erase everything and reinstall Maverick. I think I made mistakes and lost my partitions. The problem is I don't get a hard drive to select when reinstalling Maverick from the web install. I attach a series of pics, I have lost my Macintosh HD drive, it is just called "internal drive" I can't make a partition. I boot into safe mode, or try to, but it won't boot up to allow me to select a volume or drive.



Please advise how I can fix. It is being collected in 5 hours :(
Here is what you do...

Go back to Internet recovery with a command-option-r boot. Now go to Terminal and enter the command below exactly like I have it including the quotes. That will kill the Fusion drive completely.

Code:
diskutil cs delete "Internal Drive"

Now quit Terminal and start Disk Utility. You should get a popup like this offering to fix the Fusion drive. Tell it to fix the drive. That should get you back to a working Fusion drive where you can go ahead with the OS install.

fusion_drive_disk_error.png
 
Here is what you do...

Go back to Internet recovery with a command-option-r boot. Now go to Terminal and enter the command below exactly like I have it including the quotes. That will kill the Fusion drive completely.

Code:
diskutil cs delete "Internal Drive"

Now quit Terminal and start Disk Utility. You should get a popup like this offering to fix the Fusion drive. Tell it to fix the drive. That should get you back to a working Fusion drive where you can go ahead with the OS install.

View attachment 598926

Perfect, thank you :)
 
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