bootcamp partition renamed untitled after booting in MacOS

output diskutil list:

/dev/disk0 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *750.2 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_HFS Macintosh HD 275.6 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

4: Microsoft Basic Data 473.6 GB disk0s4

/dev/disk1 (external, physical):

#: TYPE NAME SIZE IDENTIFIER

0: FDisk_partition_scheme *4.1 GB disk1

1: Windows_FAT_32 USB20FD 4.1 GB disk1s1

output of sudo disk /dev/disk0:

Disk: /dev/disk0 geometry: 91201/255/63 [1465149168 sectors]

Signature: 0xAA55

Starting Ending

#: id cyl hd sec - cyl hd sec [ start - size]

------------------------------------------------------------------------

1: EE 1023 254 63 - 1023 254 63 [ 1 - 409639] <Unknown ID>

2: AF 1023 254 63 - 1023 254 63 [ 409640 - 538198808] HFS+

3: AB 1023 254 63 - 1023 254 63 [ 538608448 - 1269536] Darwin Boot

*4: 07 1023 254 63 - 1023 254 63 [ 539879424 - 925265920] HPFS/QNX/AUX

thank you for your help! don't know if automatic updates were on or not but could be the case !

output of diskutil info disk0s4:

Device Identifier: disk0s4

Device Node: /dev/disk0s4

Whole: No

Part of Whole: disk0

Device / Media Name: DOS_FAT_32_Untitled_2

Volume Name:

Mounted: Yes

Mount Point: /Volumes/Untitled

File System Personality: MS-DOS FAT32

Type (Bundle): msdos

Name (User Visible): MS-DOS (FAT32)

Partition Type: Microsoft Basic Data

OS Can Be Installed: No

Media Type: Generic

Protocol: SATA

SMART Status: Verified

Volume UUID: 6BC8D745-CF0B-3C20-A441-E03F8C2BDA5C

Disk / Partition UUID: A851B772-364F-4398-8BDA-5003608721BC

Total Size: 473.6 GB (473604608000 Bytes) (exactly 925009000 512-Byte-Units)

Volume Free Space: 473.5 GB (473466404864 Bytes) (exactly 924739072 512-Byte-Units)

Device Block Size: 512 Bytes

Allocation Block Size: 32768 Bytes

Read-Only Media: No

Read-Only Volume: No

Device Location: Internal

Removable Media: No

Solid State: No

output of : sudo dd if=/dev/rdisk0s4 count=1 2>/dev/null | hexdump -C

00000000 eb 58 90 42 53 44 20 20 34 2e 34 00 02 40 20 00 |.X.BSD 4.4..@ .|

00000010 02 00 00 00 00 f8 00 00 20 00 ff 00 60 e2 2d 20 |........ ...`.- |

00000020 68 84 22 37 00 b9 01 00 00 00 00 00 02 00 00 00 |h."7............|

00000030 01 00 06 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|

00000040 80 00 29 11 1b b1 40 42 4f 4f 54 43 41 4d 50 20 |..)...@BOOTCAMP |

00000050 20 20 46 41 54 33 32 20 20 20 fa 31 c0 8e d0 bc | FAT32 .1....|

00000060 00 7c fb 8e d8 e8 00 00 5e 83 c6 19 bb 07 00 fc |.|......^.......|

00000070 ac 84 c0 74 06 b4 0e cd 10 eb f5 30 e4 cd 16 cd |...t.......0....|

00000080 19 0d 0a 4e 6f 6e 2d 73 79 73 74 65 6d 20 64 69 |...Non-system di|

00000090 73 6b 0d 0a 50 72 65 73 73 20 61 6e 79 20 6b 65 |sk..Press any ke|

000000a0 79 20 74 6f 20 72 65 62 6f 6f 74 0d 0a 00 00 00 |y to reboot.....|

000000b0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|

*

000001f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 55 aa |..............U.|

00000200

MacBook Pro 17 inch early 2011

output sudo gpt -vv -r show /dev/disk0

gpt show: /dev/disk0: mediasize=750156374016; sectorsize=512; blocks=1465149168

gpt show: /dev/disk0: Suspicious MBR at sector 0

gpt show: /dev/disk0: Pri GPT at sector 1

gpt show: error: bogus map

gpt show: unable to open device '/dev/disk0': Undefined error: 0

I was aware that Apple did not support the 2011 models anymore but since everything worked smoothly I was very happy.

It went wrong when I booted again in MacOS and went back to windows. The macbook booted into windows to my login page, when I entered my password it said that windows needed repair.

Since there was no option getting further from within the windows interface I went back to OSx and the bootcamp partition was renamed to untitled and marked 4xx Gb MS DOS data. It was only after the distil first aid act that the data began showing as free space i think and that I got the message no operation system when I rebooted.

Again thanks a lot for your help !

I hope I can save my bootcamp setup, I will then turn off automatic updates and leave it that way. Oh yeah, and maybe directly run a backup ;-)

Since I live in Europe it is only morning now here so my answer took some time....

ok, check got fdisk installed !

should i run it from terminal ? because I don't see any icon ?

ok, this looks like this:

GPT fdisk (gdisk) version 1.0.1

Warning: Devices opened with shared lock will not have their

partition table automatically reloaded!

NOTE: Write test failed with error number 1. It will be impossible to save

changes to this disk's partition table!

You may need to deactivate System Integrity Protection to use this program. See

https://www.quora.com/How-do-I-turn-off-the-rootless-in-OS-X-El-Capitan-10-11

for more information.

Partition table scan:

MBR: hybrid

BSD: not present

APM: not present

GPT: present

Found valid GPT with hybrid MBR; using GPT.

Command (? for help):