Hello Expert(s):

Can you clarify the below statement(s) as why removable disks can't be converted into a GPT disk, but nowdays we see many of the external disks are 6TB, 8TB or even 10TB. So what the exact format we should used for those? MBR or GPT format?

•      MBR disks supports up to 2TB per single partition.
•      GPT disks supports up to 256TB per single partition in Windows.
•      Removable disks cannot be converted into a GPT disk.

Thank you,
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Seth SimmonsSr. Systems AdministratorCommented:
MBR disks supports up to 2TB per single partition.

MBR supports 2TB per physical disk
it can be a 2TB partition but the disk itself can't go beyond 2TB else the remaining space is not usable; thus requiring GPT for disk sizes greater than that

GPT disks supports up to 256TB per single partition in Windows.

correct...256TB limit for GPT in Windows

Removable disks cannot be converted into a GPT disk.

a flash drive, for example, can be made as GPT

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Removable disks can't not be converted to GPT. In fact, if you buy a disk as an external disk (within a USB enclosure for example), and if it is larger than 2TB, it will almost certainly be a GPT disk. If it isn't you would only be able to use 2TB of it's capacity.

The only problem is that older OS's might not have GPT support, so if you were connecting a GPT disk to such an old OS, it may not be able to use it. But as far as I know there is no OS left that isn't EOL that wouldn't support GPT disks.

On the other hand, if your disk is 2TB or smaller, then there is no point in making it GPT.
Lonelygirl_2012Author Commented:
Hello Expert(s),

So what you were saying is that the External Disk(s) by default is GPT and if I mistake format it as MBR then I won't able to convert it to GPT anymore?

Thank you,
If it is larger than 2 TB, it should come as a GPT disk. You can "Format" it by mistake to an MBR disk, you can only format Partitions on it. If you by mistake convert it to an MBR disk, or initialize it as an MBR disk, then you can only create partitions on it that together have a max of 2 TB. If you have an MBR disk, you can of course convert it to a GPT disk, but the process will make all data that was previously on the disk unavailable. Some 3rd party tools can do the conversion without data loss.
noxchoGlobal Support CoordinatorCommented:
The large removable disks have their own driver which makes it GPT compatible and thus the 2+TB drives are seen normally like internal drives with full capacity available.
If they come preformatted then they are using their own software for it.
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