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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