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Helpful answers
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Jul 21, 2015 7:21 AM in response to littledragon294by Loner T,BCA failed to create an MBR for your Mac. Please download GPT Fdisk http://sourceforge.net/projects/gptfdisk/ and I will give you the steps to create the appropriate MBR.
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Jul 21, 2015 7:26 AM in response to Loner Tby littledragon294,Done. How to create the appropriate MBR? I hope Macbook can boot form USB (without error :"No Bootable Disc,..) to continue the installation.
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Jul 21, 2015 7:41 AM in response to littledragon294by Loner T,These steps are different than others. We need to use all defaults supplied by Gdisk.
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 the sample 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.
- Sudo gdisk /dev/rdisk0
- P (Print list of parts)
- R (Recover)
- O (print current Hybrid MBR)
- H (chooses Hybrid)
- Partitions numbers to be hybridized: 2 3 4
- Please see the sample Q&A.
- O (print current Hybrid MBR)
- W (Write the new MBR)
- Y (Yes! write the new MBR)
- 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): Press Enter/Return
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): Press Enter/Return
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): Press Enter/Return
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Jul 21, 2015 8:04 AM in response to Loner Tby littledragon294,Done, Loner T. But patition 4 is not like the sample. Now can I continue the installation?
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Jul 21, 2015 8:13 AM in response to Loner Tby littledragon294,When I use sudo command, some differences here:
Type from one to three GPT partition numbers, separated by spaces, to be
added to the hybrid MBR, in sequence: 2 3 4
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):
Set the bootable flag? (Y/N):
Your option? (Y/N): Y
Creating entry for GPT partition #3 (MBR partition #3)
Enter an MBR hex code (default AB):
Set the bootable flag? (Y/N):
Your option? (Y/N): Y
GPT partition #4 does not exist or is too big; skipping.
Unused partition space(s) found. Use one to protect more partitions? (Y/N):
Your option? (Y/N): Y
Note: Default is 0xEE, but this may confuse Mac OS X.
After reboot, BCA:
Please help something wrong?
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Jul 21, 2015 8:24 AM in response to littledragon294by Loner T,Please post the output of
sudo gpt -vv -r show /dev/disk0
sudo fdisk /dev/disk0
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Jul 21, 2015 8:30 AM in response to Loner Tby littledragon294,sudo gpt -vv -r show /dev/disk0:
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 975093952 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC
975503592 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
976773128 7
976773135 32 Sec GPT table
976773167 1 Sec GPT header
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 0 0 2 - 25 127 14 [ 1 - 409639] <Unknown ID>
*2: AF 25 127 15 - 1023 254 63 [ 409640 - 975093952] HFS+
*3: AB 1023 254 63 - 1023 254 63 [ 975503592 - 1269536] Darwin Boot
4: EE 1023 254 63 - 1023 254 63 [ 976773128 - 40] <Unknown ID>
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Jul 21, 2015 8:50 AM in response to littledragon294by Loner T,You do not have a BC/Windows partition yet, hence you do not have a valid MBR.
1. Please boot in Safe Mode - Try safe mode if your Mac doesn't finish starting up - Apple Support and then boot normally and test BCA partition creation.
2. If that does not work, please try Using Disk Utility to verify or repair disks - Apple Support and try BCA.
3. If that does not work, please try Resolve startup issues and perform disk maintenance with Disk Utility and fsck - Apple Support and try BCA partitioning.
4. This is the last option -
a. Back up OSX using Time Machine - Mac Basics: Time Machine backs up your Mac - Apple Support.
b. Boot into Internet Recovery - OS X: About OS X Recovery - Apple Support.
c. Erase your internal drive and restore from the TM backup in Step 1 - OS X Yosemite: Recover your entire system.
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Jul 21, 2015 9:22 AM in response to Loner Tby littledragon294,Thank you for your help. But my Macbook still has problems. I can not fix it.
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Jul 21, 2015 9:25 AM in response to littledragon294by Loner T,Which step are you currently having problems with?
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Jul 21, 2015 9:39 AM in response to littledragon294by Loner T,Please create a new PMBR using the following steps.
sudo gdisk /dev/disk0
r
o
x
n
o
w
y
Reboot.
Here is an example. In the example I 'q'uit, instead of 'w', 'y'.
sudo gdisk /dev/rdisk0
Password:
GPT fdisk (gdisk) version 1.0.0
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.
Command (? for help): ?
b back up GPT data to a file
c change a partition's name
d delete a partition
i show detailed information on a partition
l list known partition types
n add a new partition
o create a new empty GUID partition table (GPT)
p print the partition table
q quit without saving changes
r recovery and transformation options (experts only)
s sort partitions
t change a partition's type code
v verify disk
w write table to disk and exit
x extra functionality (experts only)
? print this menu
Command (? for help): x
Expert command (? for help): ?
a set attributes
c change partition GUID
d display the sector alignment value
e relocate backup data structures to the end of the disk
g change disk GUID
h recompute CHS values in protective/hybrid MBR
i show detailed information on a partition
l set the sector alignment value
m return to main menu
n create a new protective MBR
o print protective MBR data
p print the partition table
q quit without saving changes
r recovery and transformation options (experts only)
s resize partition table
t transpose two partition table entries
u replicate partition table on new device
v verify disk
w write table to disk and exit
z zap (destroy) GPT data structures and exit
? print this menu
Expert command (? for help): r
Recovery/transformation command (? for help): o
Disk size is 1954210120 sectors (931.8 GiB)
MBR disk identifier: 0x028A47A7
MBR partitions:
Number Boot Start Sector End Sector Status Code
1 1 409639 primary 0xEE
2 409640 1449034287 primary 0xAF
3 1449034288 1450303823 primary 0xAB
4 * 1450305536 1954209791 primary 0x07
Recovery/transformation command (? for help): x
Expert command (? for help): n
Expert command (? for help): o
Disk size is 1954210120 sectors (931.8 GiB)
MBR disk identifier: 0x00000000
MBR partitions:
Number Boot Start Sector End Sector Status Code
1 1 1954210119 primary 0xEE
Expert command (? for help): q
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