sudo gpt -r -vv show disk0 Password: gpt show: disk0: mediasize=251000193024; sectorsize=512; blocks=490234752 gpt show: disk0: MBR at sector 0 start size index contents 0 1 MBR 1 409639 1 MBR part 175 409640 67676120 2 MBR part 175 68085760 420610419 3 MBR part 12 488696179 1677 488697856 1533952 4 MBR part 39 490231808 2944 sudo fdisk /dev/disk0 Disk: /dev/disk0 geometry: 30515/255/63 [490234752 sectors] Signature: 0xAA55 Starting Ending #: id cyl hd sec - cyl hd sec [ start - size] ------------------------------------------------------------------------ 1: AF 1023 254 63 - 1023 254 63 [ 1 - 409639] HFS+ *2: AF 1023 254 63 - 1023 254 63 [ 409640 - 67676120] HFS+ 3: 0C 1023 254 63 - 1023 254 63 [ 68085760 - 420610419] Win95 FAT32L 4: 27 1023 254 63 - 1023 254 63 [ 488697856 - 1533952] diskutil list /dev/disk0 (internal, physical): #: TYPE NAME SIZE IDENTIFIER 0: FDisk_partition_scheme *251.0 GB disk0 1: Apple_HFS DISK0S1 209.7 MB disk0s1 2: Apple_HFS Macintosh HD 34.7 GB disk0s2 3: Windows_FAT_32 215.4 GB disk0s3 4: 0x27 785.4 MB disk0s4 ... sudo gdisk /dev/disk0 Password: GPT fdisk (gdisk) version 1.0.10 Warning: Devices opened with shared lock will not have their partition table automatically reloaded! Partition table scan: MBR: MBR only BSD: not present APM: not present GPT: not present ... Warning! Main partition table overlaps the first partition by 33 blocks! You will need to delete this partition or resize it in another utility.