On Thu, Oct 24, 2013 at 9:04 AM, Chris Davies <[email protected]> wrote: > Andrew M.A. Cater <[email protected]> wrote: >> >> Debian 7.2 runs fine on UEFI, GPT partitioning works fine. You might >> want to try auto partitioning - there needs to be a 1M space at >> beginning and end of he disk and a 510M partition marked for EFIboot. > > I assume the 1MB space at the beginning is for grub_boot? I found I > needed that for my big (3TB) GPT disks. What's the space required at > the end of the disk?
Disks with msdos and gpt partition tables both have their first partition start on the 2048th sector; this has nothing to do with the bios_boot partition that's needed if you use a gpt partition with bios rather than uefi firmware (a bios_boot partition starts at the 2048th sector by default). A gpt disk needs 34 sectors at its beginning; the 0th is the mbr, the 1st is the gpt header, the 2nd-33rd are for the partition table (for 128 possible partitions at 128 bytes per partition). And it needs 33 sectors at its end; it's the same as the beginning minus the mbr. The EFI System Partition's size must depend on size of the disk to which it belongs. On my laptop with a 24GB ssd (and 1TB hd for "/home"), the ESP is 93MB (the ESP has Ubuntu and Fedora grub setups): [root@lenovo15]# gdisk -l /dev/sda ... Number Start (sector) End (sector) Size Code Name 1 2048 194559 94.0 MiB EF00 2 194560 46903295 22.3 GiB 8300 [root@lenovo15]# df -h /dev/sda1 Filesystem Size Used Avail Use% Mounted on /dev/sda1 93M 4.4M 89M 5% /boot/efi -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/CAOdo=symxeutjfcn8o-yo_v_wqj8cfbsfr8jypl5sh6+qjm...@mail.gmail.com
