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Bootcamp "No bootable disk"

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)

Posted on Jul 31, 2015 11:46 AM

Reply
41 replies

Aug 3, 2015 6:12 PM in response to Taylor.Boyd

Please do not use left/right cursor/arrow keys. Scroll down to the second MS Data entry and use 'P' to list files.


The table for partition verification


GPT3 StartGPT 3 SizeGPT3 EndSector OffsetNTFS StartNTFS SizeNTFS EndSector Offset (GB)NTFS Size (GB)
539902920126953654117245513055411737604355993539767731120.64207.71


The expected output should look similar to


User uploaded file

Aug 3, 2015 7:04 PM in response to Taylor.Boyd

Install GPT Fdisk (aka gdisk). Leave your Testdisk display and start a new Terminal Window. You need to use the following steps. If you see any error messages during the following steps, please stop and post back here with the error message. The following steps have values from your Testdisk output (and you can verify) in Steps 7 and 8. Please notice the'+' sign in step 8 (this is called offset notation). The text in parentheses is for informational purpose to describe the action being taken. Gdisk has one-character commands except when entering numbers.


Rebuild GPT4 using start/end offsets


  1. Sudo gdisk /dev/rdisk0
  2. P (print the full list of parts)
  3. D (delete)
  4. 4 (part 4)
  5. N (new part)
  6. 4 (part 4)
  7. 541173760 ( - Start offset in sectors or the start point for Bootcamp part)
  8. +435599353 ( - Size offset, as opposed to End offset)
  9. 0700 (Windows part type)
  10. P (print list of all parts just to see what changes will be made)
  11. W (Write the new GPT)
  12. Y (Yes! really write the new GPT)

This will delete and re-write the GPT partition info for /dev/disk0s4.

Rebuild MBR to match the new GPT information thus resetting the Hybrid MBR. Use defaults for other questions (like partition codes). The only values that need modifications are the Boot flags and step 10. Accept all other defaults that Gdisk offers. Please see thesample Q&A as an example. These steps can be repeated if you make a mistake before you get to Step 12, otherwise start from Step 1 for these steps. Step 6 has numbers which are typed with a space between the numbers.

  1. Sudo gdisk /dev/rdisk0
  2. P (Print list of parts)
  3. R (Recover)
  4. O (print current Hybrid MBR)
  5. H (chooses Hybrid)
  6. Partitions numbers to be hybridized: 2 3 4
  7. Y (Good for GRUB question)
  8. N (part 2 boot flag)
  9. N (part 3 boot flag)
  10. Y (part 4 boot flag make NTFS bootable partition)
  11. O (print current Hybrid MBR)
  12. W (Write the new MBR)
  13. Y (Yes! write the new MBR)
  14. Reboot


Here is sample Q&A for this section. Please notice the Press Enter/Return.


Place EFI GPT (0xEE) partition first in MBR (good for GRUB)? (Y/N): Y


Creating entry for GPT partition #2 (MBR partition #2)

Enter an MBR hex code (default AF): Press Enter/Return

Set the bootable flag? (Y/N): N


Creating entry for GPT partition #3 (MBR partition #3)

Enter an MBR hex code (default AB): Press Enter/Return

Set the bootable flag? (Y/N): N


Creating entry for GPT partition #4 (MBR partition #4)

Enter an MBR hex code (default 07): Press Enter/Return

Set the bootable flag? (Y/N): Y


Test 1 - Does Bootcamp Volume show up in Finder?

Test 2 - Can you see files in Bootcamp Volume?

Test 3 - Can you select Bootcamp in System Preferences -> Startup Disk?

Test 4 - If Test 3 is successful, select Bootcamp and Click Restart.

Aug 3, 2015 7:37 PM in response to Loner T

Last login: Mon Aug 3 22:35:02 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 1304

541173760 435599353 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

976773113 22

976773135 32 Sec GPT table

976773167 1 Sec GPT header

Taylors-Mac-mini-2:~ TaylorBoyd$ sudo disk /dev/disk0

sudo: disk: command not found

Taylors-Mac-mini-2:~ TaylorBoyd$

Aug 3, 2015 7:59 PM in response to Loner T

Last login: Mon Aug 3 22:58:01 on console

Taylors-Mac-mini-2:~ TaylorBoyd$ sudo fdisk /dev/disk0

Password:

Disk: /dev/disk0 geometry: 60801/255/63 [976773168 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 1023 254 63 - 1023 254 63 [ 409640 - 539493280] HFS+

3: AB 1023 254 63 - 1023 254 63 [ 539902920 - 1269536] Darwin Boot

4: 00 0 0 0 - 0 0 0 [ 0 - 0] unused

Taylors-Mac-mini-2:~ TaylorBoyd$

Bootcamp "No bootable disk"

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