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09-20-2012
Registered User
182,
38
MBR is okay.
GPT is needed:
a) when you want a partition to be bigger than 2GB, or when at least one of your partitions has to begin beyond the first 2GB of its disk;
b) when you want the fastest (they say) possible boot using the UEFI firmware bootmanager and UEFI boot partition(s) with UEFI OS loader(s).
However every UEFI based motherboard can boot very well a disk with MBR, too.
So: if it ain't broken, don't fix it.
Stay with your MBR.
--
Bye
EDIT: I apologize for my typo: of course I meant 2TB, not 2GB. Thanks to fpmurphy for pointing it out.
GPT is needed:
a) when you want a partition to be bigger than 2GB, or when at least one of your partitions has to begin beyond the first 2GB of its disk;
b) when you want the fastest (they say) possible boot using the UEFI firmware bootmanager and UEFI boot partition(s) with UEFI OS loader(s).
However every UEFI based motherboard can boot very well a disk with MBR, too.
So: if it ain't broken, don't fix it.
Stay with your MBR.
--
Bye
EDIT: I apologize for my typo: of course I meant 2TB, not 2GB. Thanks to fpmurphy for pointing it out.
Last edited by Lem; 09-21-2012 at 04:14 AM..
09-21-2012
Registered User
182,
38
Quote:
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