While trying to install CentOS 6.4 IN DUAL BOOT with win 7 there was this error "sda must have gpt label". I don't know how to fix it and I also don't want to repartition my hard drive.


Disable UEFI in BIOS (manual) or create a GPT partiition table (gparted or gdisk).

Example of creating one from Arch wiki:

# gdisk /dev/sdX o # create new empty GUID partition table n # partition 1 [enter], from beginning [enter], to 100GiB [+100GiB], linux fs type [enter] n # partition 2 [enter], from beginning [enter], to 108GiB [+8GiB], linux swap [8200] w # write table to disk and exit

Another option is to use parted utility during installation. Inject "CTRL+ALT+F2" during your installation process to go on command line with 'parted' utility.

(parted) print /dev/sda
(parted) select /dev/sda
(parted) mklabel gpt
(parted) yes
(parted) print /dev/sda
(parted) quit

then return to installation process with CTRL+ALT+F1.

| improve this answer | |
  • My pc is 3 years old.there is no options for UEFI in BIOS setup. – sandy Jan 3 '15 at 20:38
  • You'll have to reinstall system and add a gpt label to partition. This will remove all data on partition. I added steps to do during installation to answer. – kirill-a Jan 3 '15 at 21:35

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