i have recently backed up my mac side of my mac mini since i was moving but now i cant open my windows side it just says "No bootable disk". Im not good with tech so if someone can help me in a simple way that would be nice.
Mac mini, OS X Yosemite (10.10.4)
Can you run the following commands in Applications -> Utilities -> Terminal and post the output
diskutil list
diskutil cs list
i got this:
Last login: Fri Jul 31 14:21:10 on console
Taylors-Mac-mini-2:~ TaylorBoyd$ diskutil list
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *500.1 GB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_HFS Macintosh HD 276.2 GB disk0s2
3: Apple_Boot Recovery HD 650.0 MB disk0s3
4: Microsoft Basic Data 101.0 GB disk0s4
Taylors-Mac-mini-2:~ TaylorBoyd$ diskutil cs list
No CoreStorage logical volume groups found
Taylors-Mac-mini-2:~ TaylorBoyd$
This looks reasonable. Can you post the output of the following commands
sudo gpt -vv -r show /dev/disk0
sudo fdisk /dev/disk0
sudo dd if=/dev/rdisk0s4 count=1 2>/dev/null | hexdump -C
The "sudo" commands will prompt for your password, and it will not be echoed back. You may also see a warning about improper use of "sudo" and potential data loss due to "abuse" of the command.
this is what it shows:
Last login: Sun Aug 2 12:34:33 on console
Taylors-Mac-mini-2:~ TaylorBoyd$ sudo gpt -vv -r show /dev/disk0
Password:
gpt show: /dev/disk0: mediasize=500107862016; sectorsize=512; blocks=976773168
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 976773167
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 539493280 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC
539902920 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
541172456 238335256
779507712 197265408 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
976773120 15
976773135 32 Sec GPT table
976773167 1 Sec GPT header
Taylors-Mac-mini-2:~ TaylorBoyd$ sudo fdisk /dev/disk0
Disk: /dev/disk0 geometry: 60801/255/63 [976773168 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 - 539493280] HFS+
3: AB 1023 254 63 - 1023 254 63 [ 539902920 - 1269536] Darwin Boot
4: 0C 1023 254 63 - 1023 254 63 [ 779507712 - 197265408] Win95 FAT32L
Taylors-Mac-mini-2:~ TaylorBoyd$ sudo dd if=/dev/rdisk0s4 count=1 2>/dev/null l hexdump -C
1. Please post the output of the dd command.
2. The large gap between GPT3 and GPT4
539902920 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
541172456 238335256
779507712 197265408 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
indicates an issue which a OS X software update causes.
3. Can you use https://discussions.apple.com/thread/7108804?tstart=0 as a reference, download GPT Fdisk and Testdisk and start a Testdisk scan. Run a Quick Search and post the list of recoverable partitions from Testdisk.
ok so i know your trying to help and all and i appreciate it but is there any way you can tell me what your saying an a more simple way?? thanks🙂
and where do i download the test disk and the gdisk??
Macs uses a partitioning scheme for disks called GUID Partition table. Prior to Late 2013 models, Windows is installed using legacy BIOS and uses a partitioning scheme called Master Boot Record (MBR). Macs will implement a construct called Hybrid MBR which sets up a 1:1 mapping between the GPT table and the MBR table. Software upgrades should leave this untouched in theory, but practice is somewhat different. Mismatches in these two cause boot issue for Windows. In your specific cases, even though these match, during a software upgrade on the OS X side, the NTFS partition header chosen to rebuild the MBR was invalid. This causes a 'lost' NTFS header which is sitting in the gap between the two GPT entries #3 and #4.
Testdisk helps locate NTFS headers, and GPT Fdisk is used to correct the partition header location information and it synced so the MBR and GPT are valid, in sync, and most importantly, point a valid, bootable Windows OS.
Does this help with the next steps?
ok so how do i get test disk?
The following tools are used.
Testdisk - http://www.cgsecurity.org/wiki/TestDisk_Step_By_Step . Please the Mac-specific guide at https://imgur.com/a/PjmnK
GPT Fdisk - http://sourceforge.net/projects/gptfdisk/
TestDisk 7.0, Data Recovery Utility, April 2015
Christophe GRENIER <grenier@cgsecurity.org>
Disk /dev/disk0 - 500 GB / 465 GiB - 976773168 sectors (RO)
The harddisk (500 GB / 465 GiB) seems too small! (< 723 GB / 673 GiB)
Check the harddisk size: HD jumpers settings, BIOS detection...
The following partitions can't be recovered:
Partition Start End Size in sectors
> MS Data 976773119 1412372471 435599353
Mac HFS 976773124 978042659 1269536
This is a list of unrecoverable partitions. Bottom left should have a Press Enter to Continue, and you should see a list of viable partitions. Please post the list when you see it.
it keeps saying invalid characters when i reply
Post a screenshot using Grab. The web servers on ASC are sometimes uncooperative. 😉
how do i grab?
Bootcamp "No bootable disk"
