Hard Disk Partitions:
As you probably know you can split into several partitions on your hard disk. Question is, how do the operating system hard disk partition structure? The information had come from somewhere. This is where the MBR (master boot record), and GPT (Guid partition table) to play. Although the existing buildings on the different, and both play a similar role in the Government, provides the partition information on your hard drive.
Master Boot Record(MBR):
MBR is the old standard used to manage partitions on your hard disk and is still widely used by many people. Beginning of the MBR resides on the hard disk that contains devices of storage logical partitions in your organization. In addition, the MBR also contains the active OS partition can be scanned and loaded boot OS code code / executable.
For MBR disks, you can have only four primary partitions. To create more partitions, you can set the fourth partition as the extended partition, you will be able to create children more partitions (or logical drives). As the MBR using 32 bits to record the partition, each partition can be evaluated only to the maximum of 2 TB. This is how it seems a typical MBR disk design:
There are a few stumbling blocks with the MBR. First of all, you can only have 4 partitions on the hard disk, each partition is limited to only 2 TB in size. This is not very good with the large storage space of hard, say 100 TB. Second, the MBR is the only place that contains partitioning information. If they become corrupted (Yes, you can very easily damaged), whole disk unreadable.
GUID Partition Table (GPT):
GPT partitions on your hard disk to the latest standards in flooring. This globally unique identifier (GUID) and uses it to define the partition is part of the UEFI standard. This means that (this is required to boot Windows 8 security features) based on UEFI systems to use GPT, is a must. With GPT partition is often limited by the operating system, many of the 128 even though you can create theoretically infinite partition on the hard disk. Only 2 TB each partition in MBR, GPT partitions of different sizes are limited to 2 ^ 64 block length that can serve up to (for example, using 64-bit), 9.44 ZB (1 ZB is 1 billion terabytes) 512-byte blocks that is equivalent to. In Microsoft Windows, the size will be limited to 256 TB.
GPT in the table layout in the diagram above, the primary GPT GPT hard drive, you can see at the beginning and end of the secondary school. This makes it very useful as GPT MBR. At the end of the backup header and GPT disks partition table stored in the primary key table is corrupted. He also CRC32 errors and to detect corruption, title and partition table checksum.
In addition, you can see the cut for the first time the protective MBR hard disk. This type of hash is stored in the code field, the boot loader uses the BIOS boot from GPT Protective MBR system installation is allowed. In addition, GPT GPT disks water does not know of any damages.
OS Support:
Intel Macs by default using the GPT to MBR and you will not be able to install Mac OS x on your system (do not adjust and hackers). Although this is only where you cannot install Mac OS x works on MBR disks.
Most of the Linux kernel to support the GPT. If you compile your own kernel and you should have no problems that you do not add this functionality in versions of your favorite drive GPT. One thing to note, you wil be used as the boot loader grub 2.
For Windows only 64-bit versions of Windows since XP supports GPT disks to boot. If you get a laptop comes preloaded with 64-bit Windows 8, most likely the GPT. For Windows 7 and earlier versions, the default configuration is not GPT MBR.
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