No bootable device — insert boot disk and press any key

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hughfraser Author

Level 1

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No bootable device — insert boot disk and press any key

HI

Here is what I got from Terminal

Last login: Mon Oct 6 15:23:58 on console

hughs-imac:~ hughfraser$ 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 124.9 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

4: Apple_HFS OSX Yosemite 123.6 GB disk0s4

5: Apple_Boot Recovery HD 650.0 MB disk0s5

6: Microsoft Basic Data BOOTCAMP 250.0 GB disk0s6

hughs-imac:~ hughfraser$ diskutil cs list

No CoreStorage logical volume groups found

hughs-imac:~ hughfraser$ sudo gpt -vv -r show /dev/disk6

Password:

gpt show: unable to open device '/dev/disk6': No such file or directory

hughs-imac:~ hughfraser$ sudo fdisk /dev/disk6

fdisk: /dev/disk6: No such file or directory

hughs-imac:~ hughfraser$ sudo dd if=/dev/rdisk6 count=1 2>/dev/null | hexdump -C

hughs-imac:~ hughfraser$

Posted on Oct 6, 2014 7:43 AM

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Answer 1

Loner T

Level 9

59,513 points

Oct 6, 2014 8:32 AM in response to hughfraser

You will run into issues as you have more than 4 entries in GPT and MBR has a limit 4.

1. Suggestion would be move Beta OS to an external drive if possible.

2. Please post the output of

a. sudo gpt -vv -r show /dev/disk0

b. sudo fdisk /dev/disk0

c. sudo dd if=/dev/rdisk0s6 count=1 2>/dev/null | hexdump -C

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Answer 2

hughfraser Author

Level 1

0 points

Oct 6, 2014 12:23 PM in response to Loner T

Hi Loner T,

I haven't got the room on an external HD for the Beta OS, but I remove it if it helps

Heres my finding from Terminal:

Last login: Mon Oct 6 17:09:18 on ttys000

hughs-imac:~ hughfraser$ sudo gpt -vv -r show /dev/disk0

Password:

gpt show: /dev/disk0: mediasize=500107862016; sectorsize=512; blocks=976773168

gpt show: /dev/disk0: PMBR 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 PMBR

1 1 Pri GPT header

2 32 Pri GPT table

34 6

40 409600 1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

409640 244041704 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC

244451344 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

245720880 241502640 4 GPT part - 48465300-0000-11AA-AA11-00306543ECAC

487223520 1269536 5 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

488493056 488280064 6 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

976773120 15

976773135 32 Sec GPT table

976773167 1 Sec GPT header

hughs-imac:~ hughfraser$ 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 - 976773167] <Unknown ID>

2: 00 0 0 0 - 0 0 0 [ 0 - 0] unused

3: 00 0 0 0 - 0 0 0 [ 0 - 0] unused

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

hughs-imac:~ hughfraser$ sudo dd if=/dev/rdisk0s6 count=1 2>/dev/null | hexdump -C

00000000 eb 52 90 4e 54 46 53 20 20 20 20 00 02 08 00 00 |.R.NTFS .....|

00000010 00 00 00 00 00 f8 00 00 3f 00 ff 00 00 d0 1d 1d |........?.......|

00000020 00 00 00 00 80 00 80 00 ff 8f 1a 1d 00 00 00 00 |................|

00000030 00 00 0c 00 00 00 00 00 02 00 00 00 00 00 00 00 |................|

00000040 f6 00 00 00 01 00 00 00 6e 7d 84 b2 99 84 b2 58 |........n}.....X|

00000050 00 00 00 00 fa 33 c0 8e d0 bc 00 7c fb 68 c0 07 |.....3.....|.h..|

00000060 1f 1e 68 66 00 cb 88 16 0e 00 66 81 3e 03 00 4e |..hf......f.>..N|

00000070 54 46 53 75 15 b4 41 bb aa 55 cd 13 72 0c 81 fb |TFSu..A..U..r...|

00000080 55 aa 75 06 f7 c1 01 00 75 03 e9 dd 00 1e 83 ec |U.u.....u.......|

00000090 18 68 1a 00 b4 48 8a 16 0e 00 8b f4 16 1f cd 13 |.h...H..........|

000000a0 9f 83 c4 18 9e 58 1f 72 e1 3b 06 0b 00 75 db a3 |.....X.r.;...u..|

000000b0 0f 00 c1 2e 0f 00 04 1e 5a 33 db b9 00 20 2b c8 |........Z3... +.|

000000c0 66 ff 06 11 00 03 16 0f 00 8e c2 ff 06 16 00 e8 |f...............|

000000d0 4b 00 2b c8 77 ef b8 00 bb cd 1a 66 23 c0 75 2d |K.+.w......f#.u-|

000000e0 66 81 fb 54 43 50 41 75 24 81 f9 02 01 72 1e 16 |f..TCPAu$....r..|

000000f0 68 07 bb 16 68 70 0e 16 68 09 00 66 53 66 53 66 |h...hp..h..fSfSf|

00000100 55 16 16 16 68 b8 01 66 61 0e 07 cd 1a 33 c0 bf |U...h..fa....3..|

00000110 28 10 b9 d8 0f fc f3 aa e9 5f 01 90 90 66 60 1e |(........_...f`.|

00000120 06 66 a1 11 00 66 03 06 1c 00 1e 66 68 00 00 00 |.f...f.....fh...|

00000130 00 66 50 06 53 68 01 00 68 10 00 b4 42 8a 16 0e |.fP.Sh..h...B...|

00000140 00 16 1f 8b f4 cd 13 66 59 5b 5a 66 59 66 59 1f |.......fY[ZfYfY.|

00000150 0f 82 16 00 66 ff 06 11 00 03 16 0f 00 8e c2 ff |....f...........|

00000160 0e 16 00 75 bc 07 1f 66 61 c3 a0 f8 01 e8 09 00 |...u...fa.......|

00000170 a0 fb 01 e8 03 00 f4 eb fd b4 01 8b f0 ac 3c 00 |..............<.|

00000180 74 09 b4 0e bb 07 00 cd 10 eb f2 c3 0d 0a 41 20 |t.............A |

00000190 64 69 73 6b 20 72 65 61 64 20 65 72 72 6f 72 20 |disk read error |

000001a0 6f 63 63 75 72 72 65 64 00 0d 0a 42 4f 4f 54 4d |occurred...BOOTM|

000001b0 47 52 20 69 73 20 6d 69 73 73 69 6e 67 00 0d 0a |GR is missing...|

000001c0 42 4f 4f 54 4d 47 52 20 69 73 20 63 6f 6d 70 72 |BOOTMGR is compr|

000001d0 65 73 73 65 64 00 0d 0a 50 72 65 73 73 20 43 74 |essed...Press Ct|

000001e0 72 6c 2b 41 6c 74 2b 44 65 6c 20 74 6f 20 72 65 |rl+Alt+Del to re|

000001f0 73 74 61 72 74 0d 0a 00 8c a9 be d6 00 00 55 aa |start.........U.|

00000200

hughs-imac:~ hughfraser$

Hope that helps

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Answer 3

Loner T

Level 9

59,513 points

Oct 6, 2014 12:41 PM in response to hughfraser

Please download GPT Fdisk from http://sourceforge.net/projects/gptfdisk/. This should help in crafting a Hybrid MBR and make Windows visible.

It is good to see the NTFS header intact. This should be relatively painless with the Beta OS remaining in place. This should be tested first before Beta OS is moved anywhere.

1. Do you want to be able to read your HFS volumes from the Windows side?

2. If you plan to remove Beta OS at some point, you may need to repeat this exercise, if Windows becomes un-bootable.

3. Rather a suggestion, do not change partition sizes via Disk Utility or Windows Disk Management at all, otherwise you can cause data loss and corruption.

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Answer 4

hughfraser Author

Level 1

0 points

Oct 6, 2014 1:48 PM in response to Loner T

Hi Loner T

1 Yes I would like to be able to read & write to the HFS

2.That is OK I may cal in here and ask for some help meaning the forum.

3. Thanks, for the advise.

I had a look at GPT frisk and it looks complicated to use. Would you talk me through it?

Hugh

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Answer 5

Loner T

Level 9

59,513 points

Oct 6, 2014 2:31 PM in response to hughfraser

In the current configuration, to make Windows work, with two OSX partitions, you may be able to get read access to Beta OS, but not your original OSX, because it needs to be "hidden" in the MBR.

This should be tested before you attempt to switch to Windows. The following commands will create a new Hybrid MBR with partitions 4,5 and 6 and make 6 bootable. In the following sequence (say yes to include EFI - good for GRUB question). Partition code for 4 is AF, 5 is AB, 6 is 07 and is marked bootable.

sudo gdisk /dev/disk0

p

r

h

4 5 6

(after this point you need to follow the prompts and the codes as mentioned above).

p (one you have completed the sequence of questions).

w (to write the MBR)

y (to confirm the write).

Please post the output of sudo fdisk /dev/disk0 at this point. This will allow the MBR to be checked.

What year/model Mac is this and are you running W8.1?

If you get any error messages please stop and post back.

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Answer 6

hughfraser Author

Level 1

0 points

Oct 6, 2014 2:43 PM in response to hughfraser

Hi after I put in AF AB 07 and hit enter the prompt when dead

you can see where it went dead and not response.

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Answer 7

Loner T

Level 9

59,513 points

Oct 6, 2014 2:50 PM in response to hughfraser

AF, AB and 07 are partition codes, not GPT numbers. You need to use 4 5 6. After you enter "h", you will need to enter 4 5 6. Gdisk then will prompt you for details of each partition. the AF, AB,07 are used at that point.

It would look similar to the following. Notice the Code column.

Recovery/transformation command (? for help): p

Disk /dev/disk0: 1954210120 sectors, 931.8 GiB

Logical sector size: 512 bytes

Disk identifier (GUID): 6ED0C429-00D1-4759-B50E-04B6FB80D0E3

Partition table holds up to 128 entries

First usable sector is 34, last usable sector is 1954210086

Partitions will be aligned on 8-sector boundaries

Total free space is 1293 sectors (646.5 KiB)

Number Start (sector) End (sector) Size Code Name

1 40 409639 200.0 MiB EF00 EFI System Partition

2 409640 1452940543 692.6 GiB AF00 Customer

3 1452940544 1454210079 619.9 MiB AB00 Recovery HD

4 1454211072 1954209791 238.4 GiB 0700 BOOTCAMP

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Answer 8

hughfraser Author

Level 1

0 points

Oct 6, 2014 2:59 PM in response to hughfraser

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 - 1023 254 63 [ 1 - 245720879] <Unknown ID>

2: AF 1023 254 63 - 1023 254 63 [ 245720880 - 241502640] HFS+

3: AB 1023 254 63 - 1023 254 63 [ 487223520 - 1269536] Darwin Boot

*4: 07 1023 254 63 - 1023 254 63 [ 488493056 - 488280064] HPFS/QNX/AUX

hughs-imac:~ hughfraser$

Does this look OK? Will I reboot?

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Answer 9

Loner T

Level 9

59,513 points

Oct 6, 2014 3:04 PM in response to hughfraser

Test 1 - Can you see Bootcamp Volume in Finder?

Test 2 - Can you see files in Bootcamp volume?

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

Test 4 - If Test 1,2, and 3 are successful, select Restart after choosing Bootcamp.

If you see a hanging underline cursor in top left corner and a black screen, you may need Windows Startup Repair.

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Answer 10

hughfraser Author

Level 1

0 points

Oct 6, 2014 3:06 PM in response to Loner T

Yes to all three questions and I can still see the Beta OS there as well

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Answer 11

Loner T

Level 9

59,513 points

Oct 6, 2014 3:15 PM in response to hughfraser

Does Windows boot correctly?

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Answer 12

hughfraser Author

Level 1

0 points

Oct 6, 2014 3:16 PM in response to Loner T

Yes windows boots fine, typing for it now

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Answer 13

Loner T

Level 9

59,513 points

Oct 6, 2014 3:21 PM in response to hughfraser

Please also test switching back to OSX and test reading the Beta OS HFS+ from Windows. It should switch back to Beta OS only. If you need the other OSX installation, please power cycle and use ALT key to select the other OSX installation. This is very fragile, please make sure you have backups.

Congratulations! Very nicely done.

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Answer 14

hughfraser Author

Level 1

0 points

Oct 6, 2014 3:31 PM in response to Loner T

All three OSes are bootable from system preferences -> startup disk, BTW am using a mid 2010 21.5 iMac., things seem fine thank you very much for your help it is very much appreciated.😎

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