this is the detail from the partition. really hope to get some pointer for a fix. ------------ -bash-3.2# sudo gdisk /dev/rdisk0 -bash: sudo: command not found -bash-3.2# diskutil list /dev/disk0 (internal): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme 500.3 GB disk0 1: EFI EFI 314.6 MB disk0s1 2: Apple_CoreStorage Macintosh HD 299.4 GB disk0s2 3: Apple_Boot Recovery HD 650.0 MB disk0s3 4: Microsoft Basic Data BOOTCAMP 199.4 GB disk0s4 5: Windows Recovery 545.3 MB disk0s5 /dev/disk1 (disk image): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme +2.1 GB disk1 1: Apple_HFS OS X Base System 2.0 GB disk1s1 /dev/disk2 (internal, virtual): #: TYPE NAME SIZE IDENTIFIER 0: Macintosh HD +299.0 GB disk2 Logical Volume on disk0s2 26B1A7F0-5833-46F9-991D-53A96DFECB79 Unencrypted /dev/disk3 (disk image): #: TYPE NAME SIZE IDENTIFIER 0: untitled +5.2 MB disk3 /dev/disk4 (disk image): #: TYPE NAME SIZE IDENTIFIER 0: untitled +524.3 KB disk4 /dev/disk5 (disk image): #: TYPE NAME SIZE IDENTIFIER 0: untitled +524.3 KB disk5 /dev/disk6 (disk image): #: TYPE NAME SIZE IDENTIFIER 0: untitled +524.3 KB disk6 /dev/disk7 (disk image): #: TYPE NAME SIZE IDENTIFIER 0: untitled +524.3 KB disk7 /dev/disk8 (disk image): #: TYPE NAME SIZE IDENTIFIER 0: untitled +524.3 KB disk8 /dev/disk9 (disk image): #: TYPE NAME SIZE IDENTIFIER 0: untitled +6.3 MB disk9 /dev/disk10 (disk image): #: TYPE NAME SIZE IDENTIFIER 0: untitled +2.1 MB disk10 /dev/disk11 (disk image): #: TYPE NAME SIZE IDENTIFIER 0: untitled +1.0 MB disk11 /dev/disk12 (disk image): #: TYPE NAME SIZE IDENTIFIER 0: untitled +2.1 MB disk12 /dev/disk13 (disk image): #: TYPE NAME SIZE IDENTIFIER 0: untitled +524.3 KB disk13 /dev/disk14 (disk image): #: TYPE NAME SIZE IDENTIFIER 0: untitled +524.3 KB disk14 /dev/disk15 (disk image): #: TYPE NAME SIZE IDENTIFIER 0: untitled +1.0 MB disk15 /dev/disk16 (disk image): #: TYPE NAME SIZE IDENTIFIER 0: untitled +6.3 MB disk16 /dev/disk17 (disk image): #: TYPE NAME SIZE IDENTIFIER 0: untitled +524.3 KB disk17 -bash-3.2# disutil cs list -bash: disutil: command not found -bash-3.2# diskutil cs list CoreStorage logical volume groups (1 found) | +-- Logical Volume Group 64BB38F4-1D31-4A9B-BF9D-3A4479509A58 ========================================================= Name: Macintosh HD Status: Online Size: 299359100928 B (299.4 GB) Free Space: 6447104 B (6.4 MB) | +-< Physical Volume 50DE751D-0F5C-4C2C-8019-D4EA48148F96 | ---------------------------------------------------- | Index: 0 | Disk: disk0s2 | Status: Online | Size: 299359100928 B (299.4 GB) | +-> Logical Volume Family EC6902D4-EC1B-488C-BCF3-92FC063EB0B1 ---------------------------------------------------------- Encryption Type: None | +-> Logical Volume 26B1A7F0-5833-46F9-991D-53A96DFECB79 --------------------------------------------------- Disk: disk2 Status: Online Size (Total): 299000332288 B (299.0 GB) Revertible: Yes (no decryption required) LV Name: Macintosh HD Volume Name: Macintosh HD Content Hint: Apple_HFS -bash-3.2# sudo gpt -vv -r show /dev/disk0 -bash: sudo: command not found -bash-3.2# gpt -vv -r show /dev/disk0 gpt show: /dev/disk0: mediasize=500277792768; sectorsize=4096; blocks=122138133 gpt show: /dev/disk0: Suspicious MBR at sector 0 gpt show: /dev/disk0: Pri GPT at sector 1 gpt show: /dev/disk0: Sec GPT at sector 122138132 start size index contents 0 1 MBR 1 1 Pri GPT header 2 4 Pri GPT table 6 76800 1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B 76806 73085718 2 GPT part - 53746F72-6167-11AA-AA11-00306543ECAC 73162524 158692 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC 73321216 48683368 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7 122004584 152 122004736 133120 5 GPT part - DE94BBA4-06D1-4D40-A16A-BFD50179D6AC 122137856 272 122138128 4 Sec GPT table 122138132 1 Sec GPT header -bash-3.2# fdisk /dev/disk0 Disk: /dev/disk0 geometry: 7602/255/63 [122138133 sectors] Sector size: 4096 bytes Signature: 0xAA55 Starting Ending #: id cyl hd sec - cyl hd sec [ start - size] ------------------------------------------------------------------------ 1: EE 1023 254 63 - 1023 254 63 [ 1 - 76805] 2: AC 1023 254 63 - 1023 254 63 [ 76806 - 73085718] 3: AB 1023 254 63 - 1023 254 63 [ 73162524 - 158692] Darwin Boot *4: 07 1023 254 63 - 1023 254 63 [ 73321216 - 48683368] HPFS/QNX/AUX -bash-3.2#