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linux:liunxbasics:computerfundamentals:partition [2016/06/08 07:56] – haregylinux:liunxbasics:computerfundamentals:partition [2021/11/11 08:07] – codinghare
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 ====Partition in Liunx==== ====Partition in Liunx====
-===== =====+----
 ===Hardrive format in Linux=== ===Hardrive format in Linux===
 For SATA, USB, SAS, these type of devices are showing in Linux like: For SATA, USB, SAS, these type of devices are showing in Linux like:
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 ==LBA2-33== ==LBA2-33==
 This area is used for recording partitions informations. Each LBA has 4 records, total equal to 4 by 32 = 128. Every LBA has 64Bytes space to store number of start / end sectors, Thus, GPT could provide 264 512Bytes = 263 1KBytes = 233TB = 8 ZB space. This area is used for recording partitions informations. Each LBA has 4 records, total equal to 4 by 32 = 128. Every LBA has 64Bytes space to store number of start / end sectors, Thus, GPT could provide 264 512Bytes = 263 1KBytes = 233TB = 8 ZB space.
-===Advantages in using GPT===+===Advantages of GPT===
  
   * Unordered List ItemUses GUIDs (UUIDs) to identify partition types - No collisions.   * Unordered List ItemUses GUIDs (UUIDs) to identify partition types - No collisions.
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   * Stores a backup header and partition table at the end of the disk that aids in recovery in case the primary ones are damaged.   * Stores a backup header and partition table at the end of the disk that aids in recovery in case the primary ones are damaged.
   * CRC32 checksums to detect errors and corruption of the header and partition table.   * CRC32 checksums to detect errors and corruption of the header and partition table.
-\\ 
-\\ 
 \\ \\
 {{ :linux:liunxbasics:computerfundamentals:gpt.png |}} {{ :linux:liunxbasics:computerfundamentals:gpt.png |}}
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 Warning: For Windows, there is no support for booting from a BIOS/GPT partitioning scheme. If you have already installed Windows with a BIOS/MBR partitioning scheme do not convert the drive to GPT! Windows will fail to boot if this is done - irrespective of the bootloader used to chainload Windows. One can either install Windows in UEFI mode and use an UEFI bootloader (which uses GPT), or possibly restore/install Windows on a BIOS/GPT hybrid MBR. Warning: For Windows, there is no support for booting from a BIOS/GPT partitioning scheme. If you have already installed Windows with a BIOS/MBR partitioning scheme do not convert the drive to GPT! Windows will fail to boot if this is done - irrespective of the bootloader used to chainload Windows. One can either install Windows in UEFI mode and use an UEFI bootloader (which uses GPT), or possibly restore/install Windows on a BIOS/GPT hybrid MBR.
 </WRAP> </WRAP>
 +===BIOS / UEFI===
 +BIOS(basic input/output system) is the program a personal computer's microprocessor uses to get the computer system started after you turn it on. It also manages data flow between the computer's operating system and attached devices such as the hard disk, video adapter, keyboard, mouse and printer.\\
 +UEFI (Unified Extensible Firmware Interface) is a standard firmware interface for PCs, designed to replace BIOS (basic input/output system).\\
 +The interface defined by the EFI specification includes data tables that contain platform information, and boot and runtime services that are available to the OS loader and OS. UEFI firmware provides several technical advantages over a traditional BIOS system:
 +  * Ability to boot from large disks (over 2 TB) with a GUID Partition Table (GPT)
 +  * CPU-independent architecture
 +  * CPU-independent drivers
 +  * Flexible pre-OS environment, including network capability
 +  * Modular design
  
 +==BIOS + MBR / GPT == 
 +{{ :linux:liunxbasics:computerfundamentals:mbr-boot-sequence-1024x385.png?700 |}}\\ 
 +Because GPT also have boot loader in LBA0(MBR compatible), BIOS is also able to boot from GPT.(it requires boot loader support GPT).\\ 
 +==UEFI Booting== 
 +UEFI is designed to support GPT boot and replace BIOS. It developed by C language, so it can be easily supported by 3rd party software. Moreover, it has better user interface compare with BIOS, and could load driver before starting OS. 
 +{{ :linux:liunxbasics:computerfundamentals:uefi-pic1.png |}} 
 +<WRAP center round info 100%> 
 +Seurty boot in UEFI will cause unbootable. Try to turn this function of if you can not boot normally. 
 +</WRAP>