cannot launch gdisk on terminal

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Level 1

13 points

cannot launch gdisk on terminal

I have macbook pro OS X El Capitan and trying to launch gdisk on terminal but it gives me this error:

GPT fdisk (gdisk) version 1.0.1

Problem opening /dev/disk1 for reading! Error is 16.

I disabled the System Integrity Protection and checked it after booting and found it disabled. I'm using gdisk to overcome the partitioning problem "Windows detects GPT disk as MBR in EFI boot"

I also have another problem which is when I reboot my laptop after adding windows 10 by Boot Camp Assaistant I get this error unless I hit "alt" key, the error is:

"no bootable device. insert boot disk and press any key"

Any suggestions?

MacBook Pro, OS X El Capitan (10.11.5)

Posted on Jun 5, 2016 8:11 PM

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Answer 1

Best reply

Loner T

Level 9

59,471 points

Jul 11, 2017 10:52 AM in response to joesabol

You have either El Capitan or Sierra. You will need to disable SIP by booting into Local Recovery (using Command+R - not Internet Recovery) and click on Utilities -> Terminal and type

csrutil status

csrutil disable

csrutil status

Boot normally and check the output of csrutil status which should now be disabled. Now test GDisk.

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Answer 2

Loner T

Level 9

59,471 points

Oct 17, 2017 4:29 AM in response to bluephoenix71

You cannot run GDisk on a disk slice, it must be run on whole disk as

sudo gdisk /dev/disk0

Look at Start up your Mac in Windows or macOS - Apple Support . Are BC drivers installed on the Windows side? Do you have a Bootcamp icon in your System Tray.

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Answer 3

Oct 16, 2017 2:40 AM in response to Loner T

Hi,

My MBP retina is mid 2014 model, MacOS Sierra 10.12.6. Model identifier 11,3.

I can't use straight Bootcamp so I am using gdisk. This is the error I am getting and any inputs are appreciated.

blue$ sudo gdisk -l /dev/disk0s4

Password:

GPT fdisk (gdisk) version 1.0.3

Problem opening /dev/disk0s4 for reading! Error is 16.

diskutil list

$ diskutil list

/dev/disk0 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *500.3 GB
disk0

1: EFI EFI 209.7 MB
disk0s1

2: Apple_CoreStorage Untitled 380.2 GB
disk0s2

3: Apple_Boot Recovery HD 650.0 MB
disk0s3

4: Microsoft Basic Data BOOTCAMP 119.1 GB
disk0s4

/dev/disk1 (internal, virtual):

#: TYPE NAME SIZE IDENTIFIER

0: Apple_HFS Untitled +379.8 GB
disk1

Logical Volume on disk0s2

6C772FED-CFAC-4206-B520-2E353D584D20

Unencrypted

Please let me know what I need to do next?

Thanks,

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Answer 4

Oct 17, 2017 2:19 AM in response to Loner T

SIP has been already disabled before I installed gdisk. I just forgot to paste it here.

What I did is follow these steps:
-Start Bootcamp in Mac OS

-Choose to create windows bootable or start disk and point it to the windows ISO image I have on my HD. By default, the windows support is ticked and cannot be unticked.

-Have a tea and wait to finish

-Boot and press ALT and Choose EFI

-And have more tea while Windows install...

-BE PATIENT IF YOU SEE A BLANK SCREEN, IT WILL EVENTUALLY SHOW THE WINDOWS small circle icons circling as if thinking...

Windows is working now, but every time I boot it goes straight to windows and no option to boot to MAC.

Any suggestions?

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Answer 5

joesabol

Level 1

13 points

Jul 11, 2017 10:10 AM in response to Loner T

I am having the same issue. I get:

GPT fdisk (gdisk) version 1.0.1

Problem opening /dev/disk0 for reading! Error is 1.

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Answer 6

Loner T

Level 9

59,471 points

Jun 12, 2016 6:07 PM in response to fahad.

Please post the output of

diskutil list

diskutil cs list

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Answer 7

fahad. Author

Level 1

13 points

Jun 12, 2016 7:57 PM in response to Loner T

diskutil list

/dev/disk0 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *320.1 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_HFS Macintosh HD 229.9 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

4: Microsoft Basic Data BOOT CAMP 89.2 GB disk0s4

/dev/disk1 (external, physical):

#: TYPE NAME SIZE IDENTIFIER

0: FDisk_partition_scheme *8.0 GB disk1

1: DOS_FAT_32 WININSTALL 8.0 GB disk1s1

diskutil cs list

No CoreStorage logical volume groups found

Thanks for your reply, and I already solved the issue of "no bootable device. insert boot disk and press any key" but still have the first one.

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Answer 8

Loner T

Level 9

59,471 points

Jun 12, 2016 8:10 PM in response to fahad.

What is the year/model of your Mac?

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Answer 9

fahad. Author

Level 1

13 points

Jun 12, 2016 8:12 PM in response to Loner T

MacBook Pro Early 2011

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Answer 10

fahad. Author

Level 1

13 points

Jun 12, 2016 9:50 PM in response to Loner T

MacBook Pro Early 2011 OS X El Capitan 10.11.5

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Answer 11

Loner T

Level 9

59,471 points

Jun 13, 2016 1:02 PM in response to fahad.

Did Gdisk install properly? If yes, do you see any errors when trying to run the following command?

sudo gdisk -l /dev/disk0

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Answer 12

fahad. Author

Level 1

13 points

Jun 13, 2016 3:29 PM in response to Loner T

I think the Gdisk was installed properly because it did not complain when installing and it was done successfully. Also, I'm not sure if the symbol after the dash is a bar ' | ' or the letter ' l ' so I typed both and I got the following for each:

1-

-|/dev/disk0

-bash: /dev/disk0: Permission denied

2-

sudo gdisk -l/dev/disk0

GPT fdisk (gdisk) version 1.0.1

Problem opening -l/dev/disk0 for reading! Error is 2.

The specified file does not exist!

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Answer 13

Loner T

Level 9

59,471 points

Jun 13, 2016 4:06 PM in response to fahad.

You need a space between "-l" (letter L) and "/dev/disk0".

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Answer 14

fahad. Author

Level 1

13 points

Jun 13, 2016 4:15 PM in response to Loner T

I put a space and got the following output:

sudo gdisk -l /dev/disk0

GPT fdisk (gdisk) version 1.0.1

Warning: Devices opened with shared lock will not have their

partition table automatically reloaded!

Partition table scan:

MBR: hybrid

BSD: not present

APM: not present

GPT: present

Found valid GPT with hybrid MBR; using GPT.

Disk /dev/disk0: 625142448 sectors, 298.1 GiB

Logical sector size: 512 bytes

Disk identifier (GUID): 00006C5D-79C8-0000-316A-0000A9640000

Partition table holds up to 128 entries

First usable sector is 34, last usable sector is 625142414

Partitions will be aligned on 8-sector boundaries

Total free space is 262157 sectors (128.0 MiB)

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

1 40 409639 200.0 MiB EF00 EFI system partition

2 409640 449359719 214.1 GiB AF00 Macintosh HD

3 449359720 450629255 619.9 MiB AB00 Recovery HD

4 450629256 624880263 83.1 GiB 0700 Windows_NTFS_Untitl...

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Answer 15

Loner T

Level 9

59,471 points

Jun 13, 2016 6:40 PM in response to fahad.

GDisk is fine as the output shows. Before you make changes, what year/model is your Mac?

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