Bootcamp and Yosemite issue (Missing Operating System_)

I can no longer boot my windows 7 partition after Yosemite upgrade.
I got the "Missing Operating System_" message after using bootcamp. I can't see the windows disk in the finder on mac.
Hopefully anyone can help.
greetings
Ro
diskutil list
/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *251.0 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:          Apple_CoreStorage                         214.5 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
   4:       Microsoft Basic Data                         35.7 GB    disk0s4
/dev/disk1
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS Macintosh HD           *214.1 GB   disk1
                                 Logical Volume on disk0s2
                                 99E36170-F810-4E67-B0DE-B2936CA99760
                                 Unencrypted
diskutil cs list
CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group EB0AC927-7124-45D1-A33A-D235CE353B26
    =========================================================
    Name:         Macintosh HD
    Status:       Online
    Size:         214485266432 B (214.5 GB)
    Free Space:   18968576 B (19.0 MB)
    |
    +-< Physical Volume C4AABD80-A711-4C5A-8E9A-2A0167B92C2F
    |   ----------------------------------------------------
    |   Index:    0
    |   Disk:     disk0s2
    |   Status:   Online
    |   Size:     214485266432 B (214.5 GB)
    |
    +-> Logical Volume Family 4E06E183-A1E0-4833-A8C5-4092A76F0474
        Encryption Status:       Unlocked
        Encryption Type:         None
        Conversion Status:       NoConversion
        Conversion Direction:    -none-
        Has Encrypted Extents:   No
        Fully Secure:            No
        Passphrase Required:     No
        |
        +-> Logical Volume 99E36170-F810-4E67-B0DE-B2936CA99760
            Disk:                  disk1
            Status:                Online
            Size (Total):          214113976320 B (214.1 GB)
            Conversion Progress:   -none-
            Revertible:            Yes (no decryption required)
            LV Name:               Macintosh HD
            Volume Name:           Macintosh HD
            Content Hint:          Apple_HFS
sudo gpt -vv -r show /dev/disk0
gpt show: /dev/disk0: mediasize=251000193024; sectorsize=512; blocks=490234752
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 490234751
      start       size index contents
          0          1         MBR
          1          1         Pri GPT header
          2         32         Pri GPT table
         34          6
         40     409600      1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
     409640 418916536      2 GPT part - 53746F72-6167-11AA-AA11-00306543ECAC
419326176    1269536      3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
420595712   69638144      4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
490233856        863
490234719         32         Sec GPT table
490234751          1         Sec GPT header
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: EE    0   0   2 -   25 127 14 [         1 -     409639] <Unknown ID>
2: AF   25 127 15 - 1023 254 63 [    409640 - 418916536] HFS+
3: AB 1023 254 63 - 1023 254 63 [ 419326176 -    1269536] Darwin Boot
*4: 07 1023 254 63 - 1023 254 63 [ 420595712 -   69638144] HPFS/QNX/AUX
sudo dd if=/dev/rdisk0s4 count=1 2>/dev/null | hexdump -C
00000000 00 14 cc cc cd cc cc 05 cd 05 cb 05 cb 05 cb 05 |................|
00000010 cb 05 cb 05 cb 05 06 cb 01 d0 01 d0 07 d1 00 1f |................|
00000020 d0 d0 d0 d5 d0 d5 d0 cf d1 cf d1 cf d1 cf d1 cf |................|
00000030 d1 cf d1 cf d1 cf d1 cf d1 cf d1 cf d1 cf d1 00 |................|
00000040 0d cf 01 d0 04 cf 00 07 ca c7 cf cf cf d2 cf 00 |................|
00000050 0c d2 00 1a 7c d6 d2 d2 7c d6 7c d2 7c d6 7c d2 |....|...|.|.|.|.|
00000060 d2 f9 d2 d6 d2 f9 ce d4 ce f8 ce d4 ce f8 05 d4 |................|
00000070 00 13 f8 7e d9 f8 f8 f8 d9 7e f8 7e f8 7e 81 7f |...~.....~.~.~..|
00000080 81 7e 81 7f 81 00 0a d9 00 04 dc d9 dc d9 09 81 |.~..............|
00000090 10 db 09 81 00 15 f8 81 81 81 f8 81 81 81 f8 81 |................|
000000a0 81 81 f8 81 7e d9 7e f8 7e d9 7e 00 05 f8 00 0b |....~.~.~.~.....|
000000b0 d4 f8 ce d4 ce f8 ca ce 7c cf 7c 00 04 cf 01 7c |........|.|....||
000000c0 01 d0 00 00 00 17 2b 25 31 2b 25 25 25 1d 25 1d |......+%1+%%%.%.|
000000d0 25 2c 92 2c 22 22 22 17 22 17 27 18 91 00 06 1e |%,.,""".".'.....|
000000e0 00 cf 11 1e 11 1e 11 1e 11 19 11 19 11 19 0f 11 |................|
000000f0 0f 11 0f 19 0f 19 0f 19 0f 16 0f 16 0f 16 0f 16 |................|
00000100 0f 0f 0d 0f 0d 0f 09 1c 2a 8a 8e 21 26 2a 2a 57 |........*..!&**W|
00000110 77 60 15 13 0d 16 34 61 77 5e 15 13 0d 34 3c 13 |w`....4aw^...4<.|
00000120 60 6e 15 0e 0d 9e 6e 23 0e 13 0e 13 0d 13 c6 00 |`n....n#........|
00000130 47 26 2a 2a 2a 1c 14 16 60 77 3d c6 00 5b 2a 3d |G&***...`w=..[*=|
00000140 36 1c 57 8c 89 52 35 1b 4d 1c 15 16 1a 50 77 b6 |6.W..R5.M....Pw.|
00000150 3c 1a 1a 28 93 93 1a 61 06 4d 1a 1f 1f 1f 11 1f |<..(...a.M......|
00000160 31 88 8e 04 3a 1b 1f 48 70 70 43 28 01 01 38 48 |1...:..HppC(..8H|
00000170 01 a6 50 01 01 22 01 8b 8d 26 26 3a 3a 3a 24 3c |..P.."...&&:::$<|
00000180 25 54 e1 6e 48 02 32 98 8c 8a 9f 5a 59 8c 8a ad |%T.nH.2....ZY...|
00000190 49 58 3e 48 45 4c 5c 4c 45 4a 54 98 4c 50 60 7d |IX>HEL\LEJT.LP`}|
000001a0 06 59 4a 4e 4e 61 50 a6 77 59 4e 60 c5 c5 98 59 |.YJNNaP.wYN`...Y|
000001b0 51 00 04 53 00 72 83 00 6a 04 56 96 96 e3 00 84 |Q..S.r..j.V.....|
000001c0 5e 55 5c 62 08 eb 98 58 9b 5f 5c 5c 95 97 9e 9b |^U\b...X._\\....|
000001d0 95 95 69 d8 c5 58 97 5d e4 8c 9f 5e 99 5d ed d8 |..i..X.]...^.]..|
000001e0 b3 60 99 99 5f af 99 62 d8 f6 61 99 9e 9b 9a a0 |.`.._..b..a.....|
000001f0 d8 cd a9 99 9e 9a e9 9b 69 7d a5 9b 07 08 77 9b |........i}....w.|
00000200

kevin_ wrote:
No, and the reason is that the command converts the complete disk to the old partition scheme that was used with Mavericks and earlier systems.
This is a working system with CS and Bootcamp, on the same physical drive. CS is a Logical Volume Manager on the OSX side and bears no relationship to the Bootcamp NTFS filesystem. The only benefit of reverting from CS to plain JHFS+ allows the BC HFS driver to see the OSX volumes from Windows.
diskutil list
/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *256.1 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:          Apple_CoreStorage                         128.2 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
   4:       Microsoft Basic Data BOOTCAMP                127.0 GB   disk0s4
/dev/disk1
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS OSY-MBP13              *126.4 GB   disk1
                                 Logical Volume on disk0s2
                                 8A0116D5-7E1E-44D8-B2A0-8D4E4D48298D
                                 Unencrypted
diskutil cs list
CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group 57578357-3715-48A5-AB8A-4107AF12F7FB
    =========================================================
    Name:         OSY-MBP13
    Status:       Online
    Size:         128200753152 B (128.2 GB)
    Free Space:   1424523264 B (1.4 GB)
    |
    +-< Physical Volume 4D897085-0793-48CC-A00F-58572A56B043
    |   ----------------------------------------------------
    |   Index:    0
    |   Disk:     disk0s2
    |   Status:   Online
    |   Size:     128200753152 B (128.2 GB)
    |
    +-> Logical Volume Family 11EBF920-AA4B-4EC6-AC7F-7CC70E69883C
        Encryption Status:       Unlocked
        Encryption Type:         None
        Conversion Status:       NoConversion
        Conversion Direction:    -none-
        Has Encrypted Extents:   No
        Fully Secure:            No
        Passphrase Required:     No
        |
        +-> Logical Volume 8A0116D5-7E1E-44D8-B2A0-8D4E4D48298D
            Disk:                  disk1
            Status:                Online
            Size (Total):          126423908352 B (126.4 GB)
            Conversion Progress:   -none-
            Revertible:            Yes (no decryption required)
            LV Name:               OSY-MBP13
            Volume Name:           OSY-MBP13
            Content Hint:          Apple_HFS

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