A Disk label is a place where the disk geometry id stored. There are 2 types of labels VTOC and EFI.
The EFI label provides support for physical disks and virtual disk volumes. It is used to support disks which are more than 2TB size.
The UFS file system is compatible with the EFI disk label, and you can create a UFS file system greater than 2 TB.
You can use the format-e command to label a disk less than 1TB with an EFI label.
The EFI label provides support for physical disks and virtual disk volumes. It is used to support disks which are more than 2TB size.
The UFS file system is compatible with the EFI disk label, and you can create a UFS file system greater than 2 TB.
You can use the format-e command to label a disk less than 1TB with an EFI label.
EFI labeled disk cannot be used for booting.
For more information
http://docs.sun.com/app/docs/doc/817-5093/disksconcepts-14?a=view
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