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Managing Disks and File Systems
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GPT can support larger partition sizes . In theory, a GPT disk can be up to 18 exabytes in size (about 18,000,000 terabytes) . GPT uses primary and backup partition tables for redundancy and CRC32 fields for improved partition data structure integrity . MBR does not have redundant partition tables .
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all GpT disks start with a protective MBR partition to prevent previously released
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MBR disk tools, such as Microsoft MS-DOS FDISK or Microsoft Windows NT Disk administrator, from damaging the GpT partition because they don t recognize the partition type. If you mount an MBR disk in a 32-bit version of Windows Xp, it will see only the protective MBR partition.
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To boot from a GPT disk, the computer must support the Extensible Firmware Interface (EFI) . Basic input/output system (BIOS) based systems must boot from an MBR disk, although they can use a second GPT disk as a data disk . All removable media must use MBR .
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For more information about GpT, read the Windows and GpT FaQ at
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http://www.microsoft.com/whdc/device/storage/GPT_FAQ.mspx.
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Converting from MBR to GpT Disks
You can convert disks only from MBR to GPT, or vice versa, if the disk does not contain partitions or volumes . You can convert a disk in two ways:
In the Disk Management snap-in, right-click the MBR drive you want to convert to GPT and then click Convert To GPT Disk . If the drive is not empty or contains partitions, this option is unavailable . In the DiskPart command-line tool, select the drive you want to convert and run the command convert gpt . Similarly, to convert from GPT to MBR, run the command convert mbr .
When a dynamic disk is converted between MBR and GpT types, it must first be
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converted to a basic disk, then converted to MBR or GpT as appropriate, and then converted back to a dynamic disk. When you use the Disk Management snap-in, the conversion to a basic disk and then back to a dynamic disk happens automatically in the background. If you re using the command-line Diskpart tool, you must explicitly make the conversions.
Overview of Partitioning Disks CHapTER 16
GpT partitions
For EFI computers that boot from a GPT disk, the boot disk must contain at least the following partitions:
EFI System Partition On EFI computers, the EFI System Partition (ESP) is about 100 megabytes (MB) and contains the Windows Boot Manager files . For more information about startup files, read 29, Configuring Startup and Troubleshooting Startup Issues . The ESP has the following partition globally unique identifier (GUID):
DEFINE_GUID (PARTITION_SYSTEM_GUID, 0xC12A7328L, 0xF81F, 0x11D2, 0xBA, 0x4B, 0x00, 0xA0, 0xC9, 0x3E, 0xC9, 0x3B)
Microsoft Reserved Partition The Microsoft Reserved Partition (MSR) reserves space on each disk drive for subsequent use by operating system software . On drives smaller than 16 gigabytes (GB), the MSR is 32 MB . On drives 16 GB or larger, the MSR is 128 MB . GPT disks do not allow hidden sectors . Software features that formerly used hidden sectors now allocate portions of the MSR for feature-specific partitions . For example, converting a basic disk to a dynamic disk causes the MSR on that disk to be reduced in size, and a newly created partition holds the dynamic disk database . The MSR has the following partition GUID:
DEFINE_GUID (PARTITION_MSFT_RESERVED_GUID, 0xE3C9E316L, 0x0B5C, 0x4DB8, 0x81, 0x7D, 0xF9, 0x2D, 0xF0, 0x02, 0x15, 0xAE)
Data partition This partition stores Windows 7 system files and user files . The data partition has the following partition GUID:
DEFINE_GUID (PARTITION_BASIC_DATA_GUID, 0xEBD0A0A2L, 0xB9E5, 0x4433, 0x87, 0xC0, 0x68, 0xB6, 0xB7, 0x26, 0x99, 0xC7);
Additionally, dynamic disks can use two different GPT partitions:
A data container partition corresponding to the MBR partition 0x42, with the following GUID:
DEFINE_GUID (PARTITION_LDM_DATA_GUID, 0xAF9B60A0L, 0x1431, 0x4F62, 0xBC, 0x68, 0x33, 0x11, 0x71, 0x4A, 0x69, 0xAD);
A partition to contain the dynamic configuration database with the following GUID:
DEFINE_GUID(PARTITION_LDM_METADATA_GUID, 0x5808C8AAL, 0x7E8F, 0x42E0, 0x85, 0xD2, 0xE1, 0xE9, 0x04, 0x34, 0xCF, 0xB3);
Data disks (non-boot disks) must have an MSR and a data partition . Standard users will typically see only the data partitions; however, the other partitions will be visible to administrators using the Disk Management snap-in or the DiskPart tool .
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