MBR and GPT on Window Server

When Window Server is first installed, does it default the disk to MBR ? Can I change it to GPT afterwards ?

What's the big difference between MBR and GPT ? Should OS be better installed with MBR ?

Thx
Simon LeungAsked:
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Hello ThereSystem AdministratorCommented:
When Window Server is first installed, does it default the disk to MBR ? Can I change it to GPT afterwards ?
Yes. Usually MBR is set by default. You can change it later with a little effort.

What's the big difference between MBR and GPT ? Should OS be better installed with MBR ?
MBR supports up to 2TB of disk size and up to 4 partitions...
GPT - "no" limit and up to 128 partitions
This is the biggest difference between them.

If you use UEFI go for GPT. Otherwise I would use MBR. There is no need to boot to GPT disks unless that disk is larger than 2 TB.
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Yes. Usually MBR is set by default.
No, it depends on the firmware - if the system is UEFI it will AUTOMATICALLY use GPT regardless of disk size.  The only reason it may be "usually" MBR is because you USUALLY use BIOS based systems.

You can change it later with a little effort.
If you consider reloading Windows to be "little effort", then sure.

MBR supports BIOS.  It's 25+ year old technology.  GPT is much newer.  It supports UEFI and UEFI supports secure boot, among other things.  While GPT disks CAN be used with BIOS systems, you CANNOT install Windows on them - they won't boot.  GPT in BIOS systems only works for "D:" drives (other typically "data" disks).  And even then the OS has to support it (Windows 7 or later).  2003 MIGHT support GPT data disks. Windows 7 I THINK supports Windows 7 systems.  Windows 8/Server 2008 R2 definitely support booting from UEFI systems.

Some systems allow you to switch between BIOS and UEFI - *BUT* switching will render the installed OS unbootable and you'll need to reload (or switch back).
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Windows Server 2008

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