[技術討論] 關於在Windows建立GPT磁碟時產生的隱藏partition

本帖最後由 wai1110 於 2013-5-27 18:09 編輯

用Windows內建disk management工具去建立GPT磁碟, 會自動產生一個128MB的reserved partition
而建立/分割partition時, 又會自動產生約1MB的unallocate space

但用其他工具(即非windows內建的), 似乎就不會有以上情況出現
問題: 呢堆reserved partition/unallocate space有乜用?
Delete左佢地會唔會有問題?(當系統碟用時 或 當資料碟用時)



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有無圖可以睇睇?

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有無圖可以睇睇?
bdrom 發表於 2013-5-27 17:35



    已補圖

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http://manpages.ubuntu.com/manpages/lucid/man8/gdisk.8.html
可能 OS 會整 128MB 出黎,方便維護
If  Windows  is  to  boot  from  a GPT disk, a partition of type
Microsoft Reserved (gdisk internal code 0x0C01) is  recommended.
This  partition  should  be about 128 MiB in size.

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本帖最後由 bdrom 於 2013-5-28 00:04 編輯

Windows and GPT FAQ
http://msdn.microsoft.com/en-us/windows/hardware/gg463525.aspx

Microsoft Reserved Partition
Q.        What is a Microsoft Reserved Partition (MSR)?
         
A.       
The Microsoft Reserved Partition (MSR) reserves space on each disk drive for subsequent use by operating system software. GPT disks do not allow hidden sectors. Software components that formerly used hidden sectors now allocate portions of the MSR for component-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 Partition GUID:
DEFINE_GUID (PARTITION_MSFT_RESERVED_GUID, 0xE3C9E316L, 0x0B5C,
0x4DB8, 0x81, 0x7D, 0xF9, 0x2D, 0xF0, 0x02, 0x15, 0xAE)

Q.        What disks require an MSR?
         
A.        Every GPT disk must contain an MSR. The order of partitions on the disk should be ESP (if any), OEM (if any) and MSR followed by primary data partition(s). It is particularly important that the MSR be created before other primary data partitions.

Q.        Who creates the MSR?
         
A.        The MSR must be created when disk-partitioning information is first written to the drive. If the manufacturer partitions the disk, the manufacturer must create the MSR at the same time. If Windows partitions the disk during setup, Windows creates the MSR.

Q.        Why must the MSR be created when the disk is first partitioned?
         
A.        After the disk is partitioned, there will be no free space left to create an MSR.

Q.        How big is the MSR?
         
A.       
When initially created, the size of the MSR depends on the size of the disk drive:
On drives less than 16GB in size, the MSR is 32MB
On drives greater than or equal two 16GB, the MSR is 128 MB.
As the MSR is divided into other partitions, it becomes smaller.

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Thanks
照咁睇Microsoft係預你一定會用黎裝OS先咁講
似乎唔裝OS只當data碟用既話, 就算唔要個reserved partition都應該冇問題掛

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本帖最後由 bdrom 於 2013-5-28 17:47 編輯
Thanks
照咁睇Microsoft係預你一定會用黎裝OS先咁講
似乎唔裝OS只當data碟用既話, 就算唔要個reserve ...
wai1110 發表於 2013-5-28 15:17

Every GPT disk must contain an MSR.

你唔明呢句係咩意思?

Q.        What partitions are required by Windows?
         
A.       
For UEFI systems, the boot drive must contain an ESP, an MSR, and at least one basic data partition that contains the operating system. Only one ESP should exist on a system even if multiple operating systems are installed on that system. In a mirrored boot configuration there may actually be two drives with an ESP but they are considered to be a redundant copy of the same ESP. Each data drive must contain at least an MSR and one basic data partition.

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Every GPT disk must contain an MSR.

你唔明呢句係咩意思?

Q.        What partitions are required by Window ...
bdrom 發表於 2013-5-28 17:45



    我明

即係咁, 我已經手痕remove左個MSR, 而家正常使用中
如果日後出現咩問題, 我再上黎報告

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