Here's an article on converting gpt to mbr using parted, before trying
anything like this please backup your data

look at the Converting from GPT to MBR section
http://www.rodsbooks.com/gdisk/mbr2gpt.html

-Dan

On Sat, Jul 7, 2012 at 2:44 PM, Steve Litt <[email protected]> wrote:
> So is there a way to use parted without creating a gpt instead of an
> mbr? This sounds like a parted showstopper to me.
>
> Thanks
>
> SteveT
>
> Steve Litt                *  http://www.troubleshooters.com/
>                           *  http://twitter.com/stevelitt
> Troubleshooting Training  *  Human Performance
>
>
>
> On Sat, 7 Jul 2012 01:04:26 -0400, Andrew Leslie said:
>> The only way to change it to a mbr is to wipe the entire drive. You
>> are changing the partition layout and definition.
>> On Jul 6, 2012 9:57 PM, "brett michaels" <[email protected]>
>> wrote:
>>
>> > When I tried to install Arch on /dev/sdc4, it wouldn't install
>> > because the partition labeled as "gpt" was incorrect and instructed
>> > to use "GNU Parted" to change the label to "MBR".
>> > I have been trying to do that, but the program does not seem to
>> > recognize any drive other than /dev/sda.
>> > Below is a pasted version of one of several attempts to change the
>> > disk back to "mbr".
>> > Is there any way to get the program to recognize  the other 2
>> > drives and change the label to "mbr" without losing data?
>> > I also attempted to run GNU Parted from /dev/sdc, but it only
>> > recognizes /dev/sda..
>> > This disaster was the result of a failed attempt to install Centos..
>> >
>> > root@Plato:/home/rpmcmurphy# parted
>> > GNU Parted 2.3
>> > Using /dev/sda
>> > Welcome to GNU Parted! Type 'help' to view a list of commands.
>> > (parted) DEVICE /dev/sdc
>> >   align-check TYPE N                        check partition N for
>> > TYPE(min|opt)
>> >         alignment
>> >   check NUMBER                             do a simple check on the
>> > file system
>> >   cp [FROM-DEVICE] FROM-NUMBER TO-NUMBER   copy file system to
>> > another partition
>> >   help [COMMAND]                           print general help, or
>> > help on COMMAND
>> >   mklabel,mktable LABEL-TYPE               create a new disklabel
>> > (partition
>> >         table)
>> >   mkfs NUMBER FS-TYPE                      make a FS-TYPE file
>> > system on partition NUMBER
>> >   mkpart PART-TYPE [FS-TYPE] START END     make a partition
>> >   mkpartfs PART-TYPE FS-TYPE START END     make a partition with a
>> > file system
>> >   move NUMBER START END                    move partition NUMBER
>> >   name NUMBER NAME                         name partition NUMBER as
>> > NAME print [devices|free|list,all|NUMBER]     display the partition
>> > table, available devices, free space, all found partitions, or a
>> > particular
>> >         partition
>> >   quit                                     exit program
>> >   rescue START END                         rescue a lost partition
>> > near START
>> >         and END
>> >   resize NUMBER START END                  resize partition NUMBER
>> > and its file
>> >         system
>> >   rm NUMBER                                delete partition NUMBER
>> >   select DEVICE                            choose the device to edit
>> >   set NUMBER FLAG STATE                    change the FLAG on
>> > partition NUMBER
>> >   toggle [NUMBER [FLAG]]                   toggle the state of FLAG
>> > on partition
>> >         NUMBER
>> >   unit UNIT                                set the default unit to
>> > UNIT version                                  display the version
>> > number and copyright information of GNU Parted
>> >   align-check TYPE N                        check partition N for
>> > TYPE(min|opt)
>> >         alignment
>> >   check NUMBER                             do a simple check on the
>> > file system
>> >   cp [FROM-DEVICE] FROM-NUMBER TO-NUMBER   copy file system to
>> > another partition
>> >   help [COMMAND]                           print general help, or
>> > help on COMMAND
>> >   mklabel,mktable LABEL-TYPE               create a new disklabel
>> > (partition
>> >         table)
>> >   mkfs NUMBER FS-TYPE                      make a FS-TYPE file
>> > system on partition NUMBER
>> >   mkpart PART-TYPE [FS-TYPE] START END     make a partition
>> >   mkpartfs PART-TYPE FS-TYPE START END     make a partition with a
>> > file system
>> >   move NUMBER START END                    move partition NUMBER
>> >   name NUMBER NAME                         name partition NUMBER as
>> > NAME print [devices|free|list,all|NUMBER]     display the partition
>> > table, available devices, free space, all found partitions, or a
>> > particular
>> >         partition
>> >   quit                                     exit program
>> >   rescue START END                         rescue a lost partition
>> > near START
>> >         and END
>> >   resize NUMBER START END                  resize partition NUMBER
>> > and its file
>> >         system
>> >   rm NUMBER                                delete partition NUMBER
>> >   select DEVICE                            choose the device to edit
>> >   set NUMBER FLAG STATE                    change the FLAG on
>> > partition NUMBER
>> >   toggle [NUMBER [FLAG]]                   toggle the state of FLAG
>> > on partition
>> >         NUMBER
>> >   unit UNIT                                set the default unit to
>> > UNIT version                                  display the version
>> > number and copyright information of GNU Parted
>> > (parted) print
>> > Model: ATA WDC WD20EARS-00M (scsi)
>> > Disk /dev/sda: 2000GB
>> > Sector size (logical/physical): 512B/512B
>> > Partition Table: gpt
>> >
>> > Number  Start   End     Size    File system     Name  Flags
>> >  1      17.4kB  1018kB  1000kB                        bios_grub
>> >  2      1018kB  1984GB  1984GB  ext3                  boot
>> >  3      1984GB  2000GB  16.4GB  linux-swap(v1)
>> >
>> > (parted) DEVICE /dev/sdc mklabel
>> >   align-check TYPE N                        check partition N for
>> > TYPE(min|opt)
>> >         alignment
>> >   check NUMBER                             do a simple check on the
>> > file system
>> >   cp [FROM-DEVICE] FROM-NUMBER TO-NUMBER   copy file system to
>> > another partition
>> >   help [COMMAND]                           print general help, or
>> > help on COMMAND
>> >   mklabel,mktable LABEL-TYPE               create a new disklabel
>> > (partition
>> >         table)
>> >   mkfs NUMBER FS-TYPE                      make a FS-TYPE file
>> > system on partition NUMBER
>> >   mkpart PART-TYPE [FS-TYPE] START END     make a partition
>> >   mkpartfs PART-TYPE FS-TYPE START END     make a partition with a
>> > file system
>> >   move NUMBER START END                    move partition NUMBER
>> >   name NUMBER NAME                         name partition NUMBER as
>> > NAME print [devices|free|list,all|NUMBER]     display the partition
>> > table, available devices, free space, all found partitions, or a
>> > particular
>> >         partition
>> >   quit                                     exit program
>> >   rescue START END                         rescue a lost partition
>> > near START
>> >         and END
>> >   resize NUMBER START END                  resize partition NUMBER
>> > and its file
>> >         system
>> >   rm NUMBER                                delete partition NUMBER
>> >   select DEVICE                            choose the device to edit
>> >   set NUMBER FLAG STATE                    change the FLAG on
>> > partition NUMBER
>> >   toggle [NUMBER [FLAG]]                   toggle the state of FLAG
>> > on partition
>> >         NUMBER
>> >   unit UNIT                                set the default unit to
>> > UNIT version                                  display the version
>> > number and copyright information of GNU Parted
>> >   align-check TYPE N                        check partition N for
>> > TYPE(min|opt)
>> >         alignment
>> >   check NUMBER                             do a simple check on the
>> > file system
>> >   cp [FROM-DEVICE] FROM-NUMBER TO-NUMBER   copy file system to
>> > another partition
>> >   help [COMMAND]                           print general help, or
>> > help on COMMAND
>> >   mklabel,mktable LABEL-TYPE               create a new disklabel
>> > (partition
>> >         table)
>> >   mkfs NUMBER FS-TYPE                      make a FS-TYPE file
>> > system on partition NUMBER
>> >   mkpart PART-TYPE [FS-TYPE] START END     make a partition
>> >   mkpartfs PART-TYPE FS-TYPE START END     make a partition with a
>> > file system
>> >   move NUMBER START END                    move partition NUMBER
>> >   name NUMBER NAME                         name partition NUMBER as
>> > NAME print [devices|free|list,all|NUMBER]     display the partition
>> > table, available devices, free space, all found partitions, or a
>> > particular
>> >         partition
>> >   quit                                     exit program
>> >   rescue START END                         rescue a lost partition
>> > near START
>> >         and END
>> >   resize NUMBER START END                  resize partition NUMBER
>> > and its file
>> >         system
>> >   rm NUMBER                                delete partition NUMBER
>> >   select DEVICE                            choose the device to edit
>> >   set NUMBER FLAG STATE                    change the FLAG on
>> > partition NUMBER
>> >   toggle [NUMBER [FLAG]]                   toggle the state of FLAG
>> > on partition
>> >         NUMBER
>> >   unit UNIT                                set the default unit to
>> > UNIT version                                  display the version
>> > number and copyright information of GNU Parted
>> > New disk label type? MBR
>> > parted: invalid token: MBR
>> > New disk label type? GPT
>> > Warning: Partition(s) on /dev/sda are being used.
>> > Ignore/Cancel? Cancel
>> > (parted)
>> >
>
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