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Full Discussion: Disk Paritioning Scheme--GPT or MBR
Operating Systems Linux Fedora Disk Paritioning Scheme--GPT or MBR Post 302704087 by Lem on Friday 21st of September 2012 03:13:43 AM
Old 09-21-2012
Quote:
Originally Posted by fpmurphy
MBR partitions can be greater than 2Gb. GPT is required when your disk is greater than approx 2Tb and using 512 sector sizes.
Of course, it was a typo: I meant 2TB. Smilie

In MBR every partition is defined by its starting sector and its size in sectors. Both values are limited to 32 bits. So a partition max size, as well as its farthest possible starting point, is:
(2^32-1) x 512 = 2,199,023,255,040 bytes.

This means that you can use a MBR for two 1.5TB partitions in a 3TB disk, for instance. On the same disk you can't use MBR for a single 3TB partition, nor for four 750GB partitions, nor for two partitions of 0.5TB and 2.5TB ...

Today even disks having 4kB sectors show to the system virtual sectors of 512B. So the disk sector real size doesn't affect the 2TB limit.
--
Bye
 

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LEARN ABOUT CENTOS

systemd-gpt-auto-generator

SYSTEMD-GPT-AUTO-GENERATOR(8)				    systemd-gpt-auto-generator				     SYSTEMD-GPT-AUTO-GENERATOR(8)

NAME

       systemd-gpt-auto-generator - Generator for automatically discovering and mounting /home as well as discovering and enabling swap
       partitions, based on GPT partition type GUIDs.

SYNOPSIS

       /usr/lib/systemd/system-generators/systemd-gpt-auto-generator

DESCRIPTION

       systemd-gpt-auto-generator is a generator that automatically discovers /home and swap partitions and creates mount and swap units for them,
       based on the the partition type GUIDs of GUID partition tables (GPT). Note that this generator will execute no operation on non-GPT
       systems, on systems where the units are explicitly configured (for example, listed in fstab(5)) or where the mount point is non-empty.

       This generator will only look for partitions on the same physical disk the root file system is stored on. This generator has no effect on
       systems where the root file system is distributed on multiple disks, for example via btrfs RAID.

       This generator is useful for centralizing file system configuration in the partition table and making manual configuration in /etc/fstab or
       suchlike unnecessary.

       This generator looks for swap partitions using GPT type 0657fd6d-a4ab-43c4-84e50933c84b4f4f. It looks for /home partitions using GPT type
       933ac7e1-2eb4-4f13-b8440e14e2aef915.

       systemd-gpt-auto-generator implements the generator specification[1].

SEE ALSO

       systemd(1), systemd.mount(5), systemd.swap(5), systemd-efi-boot-generator(8), fstab(5)

NOTES

	1. generator specification
	   http://www.freedesktop.org/wiki/Software/systemd/Generators

systemd 208													     SYSTEMD-GPT-AUTO-GENERATOR(8)
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