= 2013-11-23 =

== 4TB 硬碟開機 ==

 * <狀況> 使用 preseed 安裝 Ubuntu 12.04 到一 4TB 硬碟，分割區自動切割為 /dev/sda1 (未格式化) , /dev/sda2 (EXT4), /dev/sda3 (SWAP)
 　* 掛載 /dev/sda2 確實有 Ubuntu 12.04 安裝後的檔案，但無法開機。
   * [[Image(jazz/13-11-23:ubuntu_4TB_partition.png)]]
 * <懷疑> 找了些資料，首先，因為太大，必須改用 GPT。這一點 Ubuntu 12.04 確實已經改用 GPT 了。
   * 其次，應該就是 grub 如何正確安裝到 GPT 的硬碟上，好讓它可以正常開機。
   * 條件一：磁區必須是 BIOS Boot Partition 或 EFI System Partition - [http://ubuntuforums.org/showthread.php?t=1831899 參考來源]
{{{
Be aware that if you're booting from a GPT disk, you may need to include special partitions -- 
either a BIOS Boot Partition for BIOS-based computers or an EFI System Partition (ESP) for EFI- or UEFI-based computers. 
If the disk isn't a boot disk, you don't need these features. 
}}}
   * 驗證工具：gfdisk
{{{
parted isn't the only GPT-capable partitioning tool in Linux. Anything based on libparted (parted, GParted, 
Palimpsest Disk Utility, or others) will do, as will the GPT fdisk tools (gdisk or sgdisk). The util-linux 
tools (fdisk, sfdisk, and cfdisk) can't handle GPT. The Ubuntu installer is based on libparted and so is GPT-capable.
}}}
 * <實驗> 產生一個 4TB 的虛擬硬碟給 VirtualBox 用。
{{{
~$ sudo apt-get install qemu-utils
~$ qemu-img create -f vmdk Ubuntu_4TB.vmdk 4T
}}}