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vasant910

Won't boot without USB process - can't write MBR on disk

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vasant910    0
Won't boot without USB process - can't write MBR on disk

Followed procedure documented to boot new MBR on disk drive so I can boot without USB.

https://www.tonymacx86.com/threads/os-x-wont-start-without-uni-multibeast-usb-heres-the-solution.152329/

Check what it says under 'NAME' for your uni/multibeast usb (mine is called 'Multibeast') and write:

  • cd /Volumes/Multibeast/usr/standalone/i386
  • fdisk -f boot0 -u -y /dev/rdisk0
  • dd if=boot1h of=/dev/rdisk0s1
  • After entering the last command you should get some feedback saying '2+0 records in, 2+0 records out', or something similar. Write:
  • cp boot /Volumes/EFI/
  •  

Gives an error at fidsk command : 

sh-3.2# cd /Volumes/USB1112/usr/standalone/i386/

sh-3.2# fdisk -f boot0 -u -y /dev/rdisk1

fdisk: could not open MBR file boot0: No such file or directory

sh-3.2# fdisk -e /dev/disk1

fdisk: could not open MBR file /usr/standalone/i386/boot0: No such file or directory

Enter 'help' for information

fdisk: 1> print

Disk: /dev/disk1 geometry: 30401/255/63 [488397168 sectors]

Offset: 0 Signature: 0xAA55

         Starting       Ending

 #: id  cyl  hd sec -  cyl  hd sec [     start -       size]

------------------------------------------------------------------------

 1: EE 1023 254  63 - 1023 254  63 [         1 -  488397167] <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      

fdisk: 1> exit

 

Tried to write MBR documents as :

fdisk: could not open MBR file /usr/standalone/i386/boot0: No such file or directory

Enter 'help' for information

fdisk: 1> show

Invalid command 'show'.  Try 'help'.

fdisk: 1> flag 3

Partition 3 marked active.

fdisk:*1> write

Device could not be accessed exclusively.

A reboot will be needed for changes to take effect. OK? [n] y

Writing MBR at offset 0.

fdisk: 1> exit

BUT I still get same error "

could not open MBR file boot0: No such file or directory

 

Please help,

Vasant

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