Partition mess, trying to install clean High Sierra

[Laurent_M]

Hi everybody,

i'm new here.

I spent the last few days trying to erase my partitions on my old MacBookPro late 2011. It seems i erased some things i shouldn't have, using Terminal.

i just want to erase everything and start new with 1 partition (500 Go).

command option r, doesn't work

macbook-pro-de-laurent:~ laurent$ diskutil list
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *500.1 GB disk0
1: EFI 209.7 MB disk0s1
2: Apple_HFS Untitled 300.0 GB disk0s2
3: Apple_HFS Untitled 97.7 GB disk0s3
4: Apple_Boot Recovery HD 650.0 MB disk0s4
macbook-pro-de-laurent:~ laurent$ diskutil cs list
No CoreStorage logical volume groups found


please help ;-)
Laurent

 

[DaveFromCampbelltown]

Your computer will need to be connected to the Internet via an ethernet cable to your router.
Reboot, holding down CMD-R. (not CMD-OPT-R)
That should boot up into the recovery system and you should be able to download and install a new system.

 

[Laurent_M]

Hi Dave,
Thank you for your reply.

It unfortunately didn't work. I tried 2 times. Every time, i selected the 300.0 GB disk0s2 partition. Then everything looks ok. And when OS Lion is finally installed i check the disk, and i'm on the other partition 97.7 GB disk0s3.

So partition disk0s2 is still lost somewhere. Someone told me i erased via Terminal the virtual "thing", and now i can't access it or modify or erase it.

Any other solutions from you?

 

[Amethyst1]

Do you have, or have a way to create a bootable macOS (preferably) High Sierra installer on a USB flash drive? If so, you should try to boot from this one, use Disk Utility to erase the hard drive, which will automatically create just one big partition and perform a clean installation of High Sierra.

 

[Laurent_M]

Yes i can do that.
is that a .iso file?

reboot with command R ?

 

[Amethyst1]

No, it's not a simple image file you can write to a USB drive, unfortunately. You have to download the Install macOS High Sierra application from e.g. here and then use the createinstallmedia command buried deep within that application to properly create a bootable USB installer. The problem I anticipate is that the createinstallmedia command may not work on Mac OS X Lion, which is what Internet Recovery ends up putting on the Mac. Catch-22...

 

[Laurent_M]

thank you for the infos. i have another Mac (OS 10.14). I'll do the USB with it.
let you know

 

[Laurent_M]

It went all perfectly, but I still have two partitions.
On the 300GB (diskos2) partition, I have now High Sierra working great. (Thank you !)
But I still have the other partition (97,7 GB) and a lot of free space (97,4 GB) that I can't erase or resize.

see attached.

any ideas?