b0 error

You’ll receive this error if you have partitioned your disk using the 10.4.4 Disk Utility, using a Windows 98 Bootdisk run
fdisk /mbr
then run fdisk & make the partition you installed OS X on active & reboot, OS X should boot now without any probs 🙂

41 Replies to “b0 error”

  1. Try booting up to the install disc again. Go to the terminal under utilities and type “fdisk -u /dev/rdisk0” Should do the same thing.

  2. I’m getting b0 error also. I tried using both “fdisk /mbr”(using a windows boot disk) and “fdisk – u /dev/rdisk0” (from terminal, using install DVD) – but neither worked.

    Surprisingly, if I leave the installation DVD in the drive, I can boot to OS X, but not without. Also, if I try to use the “Startup DIsk” utility, it doesn’t even list my hard drive, it only shows the DVD drive.

    Any help would be much appreciated.

  3. start with the installation disk
    at darwin prompt, press F8, then input -v -s and stroke return
    now wait for console (the shell #)
    when the shell is ready, enter fdisk -e /dev/rdisk0
    it will load fdisk, you should see:
    fdisk 1>
    with a prompt.
    Here enter “flag 1” (without quotes) and then return
    then enter “quit” (w/o quotes) and then return
    it should says “MBR saved”
    now type “exit” (again, w/o quotes) and return

  4. I did what HAL said last, and now it load ups Darwin/x86, but now when it boots up, it gets stuck on the gray apple boot up screen with the spinning wheel, and thereafter, i see a circle with a slash through it on top of the apple logo.

    Any ideas why ? (seems as though perhaps Dell Inspiron 8200 with Intel P4 is not compatible with Darwin/x86 boot v 5.0.132)

    Any help would be appreciated. Thanks in advance!

  5. Okay, so i just had to get the appropriate patches from the customized installation when installing.. and then it boots up Mac OS X.

  6. >I did what HAL said last, and now it load ups Darwin/x86, but now when it >boots up, it gets stuck on the gray apple boot up screen with the spinning >wheel, and thereafter, i see a circle with a slash through it on top of the >apple logo.

    Thats what i see too!

    >Okay, so i just had to get the appropriate patches from the customized >installation when installing.. and then it boots up Mac OS X.

    patches? where?

  7. I need to read more carefully! Just like he said – during the install, right after you pick which partition to install on there is a customize install button in the lower left of the window. within the custom install menu you select the x86 patch.

  8. Yep, if you macos installation get stuck on load screen with apple logo, or just before the desktop loads, is because you haven’t selected the right patches for your CPU 😉

  9. HAL

    thx a million i was desperate until now =)
    again: thx a million

    grtz,

    S-olo

  10. I did what HAL said last, and now it load ups Darwin/x86, but now when it
    macosx
    boots up, it gets stuck on the gray apple boot up screen with the spinning wheel, and thereafter, i see a circle with a slash through it on top of the apple logo.

    Any ideas why ? (seems as though perhaps Dell Inspiron 8200 with Intel P4 is not compatible with Darwin/x86 boot v 5.0.132)

    Any help would be appreciated. Thanks in advance!
    ————————————————————————————-

    When it gets stuck at the grey apple logo, is mostly due to improper drive(s) designation. i.e DVD rom set to slave on secondary ide with no master present.
    Hope this helps.
    BTW had same b0 error!

  11. The -v -s worked like a charm, but now my windows XP install doesnt seem to boot from the NT Menu… It hangs at the winXP logo boot screen. Does MAC OS play around with other partitions when it installs?

  12. Hal thanks so much. The way I had to do it was -s -v. But everything else was perfect!

  13. When i get to where the shell is ready, and i type fdisk -e/dev/rdisk0 it gives me an error rather then swtiching to fdisk 1> am i doing something wrong?

  14. to Jer:

    Yeah, I made the same mistake, make sure there’s a space between the -e and /dev/rdisk0.

    That should work for you, then.

  15. Well a quick update. HAL, you do not know how much time you have saved me. I have this page bookmarked now. I have succesfully installed apple on more than one computer and I have used that command each time! So I thank you from the bottom of my heart!!!

  16. Unfortunately it’s not working for me…I have tried everything. Same error, but if i check…the partition with leopard is marked as active…so I don’t know what to do. I can only boot with the OSX86 dvd. I have used the flag method too. My diskutil list is like this….if anyone has any other ideas…please share…Thanks
    Last login: Wed Jan 2 08:25:23 on console
    alexs-mac-pro:~ AM$ sudo -s
    Password:
    bash-3.2# diskutil list
    2008-01-02 08:27:27.756 diskutil[161:10b] _CFGetHostUUIDString: unable to determine UUID for host. Error: 35
    2008-01-02 08:27:28.083 DiskManagementTool[162:10b] _CFGetHostUUIDString: unable to determine UUID for host. Error: 35
    /dev/disk0
    #: TYPE NAME SIZE IDENTIFIER
    0: FDisk_partition_scheme *465.8 Gi disk0
    1: Apple_HFS Leopard 14.3 Gi disk0s1
    2: Apple_HFS Mac-Data 14.3 Gi disk0s2
    3: Windows_NTFS DATA-2 437.1 Gi disk0s5
    /dev/disk1
    #: TYPE NAME SIZE IDENTIFIER
    0: FDisk_partition_scheme *372.6 Gi disk1
    1: Windows_NTFS SYSTEM 31.3 Gi disk1s1
    2: Windows_NTFS DATA-1 330.8 Gi disk1s5
    3: Windows_NTFS Recovery 10.5 Gi disk1s2
    /dev/disk2
    #: TYPE NAME SIZE IDENTIFIER
    0: Apple_partition_scheme *4.4 Gi disk2
    1: Apple_partition_map 31.5 Ki disk2s1
    2: Apple_HFS Leopard_Install_Osx86 4.4 Gi disk2s2

  17. After I do the whole:

    start with the installation disk
    at darwin prompt, press F8, then input -v -s and stroke return
    now wait for console (the shell #)
    when the shell is ready, enter fdisk -e /dev/rdisk0
    it will load fdisk, you should see:
    fdisk 1>
    with a prompt.
    Here enter “flag 1″ (without quotes) and then return
    then enter “quit” (w/o quotes) and then return
    it should says “MBR saved”
    now type “exit” (again, w/o quotes) and return

    It boots and loads a tonne of files in about 10 seconds then the screen goes black and it does it again in smaller print then it stops after Kernel version, then just stops.

  18. HAL,
    This method killed my boot at all. so i can’t boot even from install dvd (and without it the same problem b0 error)
    via Hiren’s BootCD I checked that Leopard partition is primary and active.
    Is there any alternative methods? What about using grub?

  19. hi. i am getting the “b0 error” aswell and i am not sure how to fix this. i already have windows vista installed on one partition and it tried to install osx on the other but it wouldn’t work. now, i want to just run vista. i can boot to a cd/dvd but nothing else for some reason. when i boot to a linux live cd i can see that windows is still installed, and i even did a system restore through the vista install disk, but it won’t let me boot to it. how can i tell my computer to boot onto my vista partition. i have 3 partitions. the first is a backup partition put on by the computer manufacturer, the second is vista, and the third is where i tried to install osx. can someone please help? My computer is currently worthless.

    thanks,
    alex

  20. I did the customize option after i had the “b0 error” and i no longer get the error but now I see the apple bootup but just stays there. the screen shows active with the animation but no HDD activity.

  21. OK, i first installed leopard with “kalyway_leo_10.5.1” it worked fine.
    so I’m in leopard, and my battery dies. no problem right? i reboot and i get this b0 error or something like that, but it works fine when i boot with the disc. when i try with out the disc it gives me that error, I’ve tried a lot of stuff already, setting the partition to active and all that bs, nothing seems to work. i going to install it 1 more time and try all the fixes out. but, can anybody help me out if you know what’s going on? thanks in advance..,

  22. Same error for me, i saw macosx only twice – right after installation completion and once starting with kalyway 10.5.1 dvd, i tried all fix, but i got this HFS+ partition error whenewer i try to run macosx…
    maybe this is because macosx partition is over 1024th hard disk sector?

  23. I tried the method with Console which HAL mentioned in Comment 12.
    But now instead of b0 error, I get HFS+ Partition error !!!

    What do I do now ???

  24. when i press quit it not says “MBR saved” just “writing current MBR to disk” and I have the console #. I still have r0 error.

  25. So frustrated tried so many installs and was about to give up when i turned my monitor back on and the rest of the installer came up, everything went great i was fully in leopard and now i have no idea how to get back in, after reboot i get the b0 error. anyone know how i managed to get in in the first place?

  26. YES YES YES! 16 odd hours after starting this whole mess i have turned a pille of steaming vista into an eligant fully functional Mac. long live the new king

    I managed to fix my problem by booting from disc and then F8 and typed in vanilla and let it boot, then patched it from the inside. good luck everyone

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