I know there is a plenty on the Internet, but I am afraid to touch it since the data on my partition is valuable for me now.
I have MacBook Air with OS Yosemite 2011 11" (128G).
I wanted to create a dual-boot configuration (MacOS + Windows) and succeeded. (I did following protective MBR creation manual somewhere on the net). After a while, Windows started consuming too much space, so I decided to re-install it with a lighter build.
What happened is that I dropped the partition (600 MB) in Windows installer in order to re-map the space, and LOST ability to boot in MacOS.
( Originally, I thought it was Microsoft Reserved partition, but the answer below suggested it was "booter" partition. )
I did restore the boot by installing rEFInd to EFI drive.
Currently, MacOS partition is not visible if I press "Options" key, but it still boots up thankfully to EFI boot.
Trying to remap the drive, I did drop all Windows partitions in order to put that space back to MacOS one.
The issue is that now I can not edit partitions via DiskUtility (the one with GUI) - it just simply does nothing when I try to modify them. It shows gray circle at the beginning of "MBR" space.
My output of diskutil list is following (there is an interesting thing that record for GPT and MBR for MacOS partition is different: 51.2GB versus 50.8GB, that has happened because I did merge dropped 600MB with MacOS partition via DiskUtility):
mes-MacBook-Air:~ me$ sudo diskutil list /dev/disk0 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *121.3 GB disk0 1: EFI EFI 314.6 MB disk0s1 2: Apple_CoreStorage 51.2 GB disk0s2 /dev/disk1 #: TYPE NAME SIZE IDENTIFIER 0: Apple_HFS MacOS *50.8 GB disk1 Logical Volume on disk0s2 84A33FDC-BA63-43B5-A43F-E4BF61D0830A Unencrypted $ sudo gpt -r show /dev/disk0 start size index contents 0 1 PMBR 1 1 Pri GPT header 2 4 Pri GPT table 6 76800 1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B 76806 12500474 2 GPT part - 53746F72-6167-11AA-AA11-00306543ECAC 12577280 17044987 29622267 4 Sec GPT table 29622271 1 Sec GPT header
Help me out to put the space back and merge it back into one. Or guide me to the good source on the topic if I ask too much.
Thank you people.