Phillip Susi wrote: > On 12/28/2011 05:50 PM, Håkon Løvdal wrote: >> Since the first partition starts at 1MB there is space available in front >> of this, so I want to create this BIOS Boot Partition so that it starts >> right after the GPT and spans up til the start of the /boot partition. > > FYI, you shouldn't need a dedicated /boot partition.
True, but it can be useful. >> So my question then is, how do I find the exact size of the GPT? >> Should I leave some free space between the GPT and the BIOS >> Boot Partition, and if so how much? > > The GPT is usually in the first 64kb so you can create a bios_grub > partition between sector 129 and 2048. 64kb is not large enough on a disk with 4KB sectors. Technically, the primary GPT header occupies sectors 1..33 of your disk. The 0'th sector is the so-called protective MBR. That means you can start the BIOS boot partition at sector 34, aka "34s". With parted, that "34s" notation works regardless of whether you're using a drive with 512-byte sectors (most common) or a newer one with 4k-byte sectors. If you'd prefer to make your BIOS boot partition start on a more even boundary, you can leave a gap so that you start it on say, sector 128, or 256, etc. However, that does leave a gap that shows up as being free. Shouldn't matter, but you never know...
