Boot your laptop in Recovery Mode (cmd+R)
- Open the Terminal and find the
Apple_Boot Recovery HD
.
# diskutil list
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *250.1 GB disk0
1: EFI 209.7 MB disk0s1
2: Apple_HFS Macintosh HD 249.2 GB disk0s2
3: Apple_Boot Recovery HD 650.0 MB disk0s3