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| linux:liunxbasics:computerfundamentals:partition [2016/06/08 07:25] – haregy | linux:liunxbasics:computerfundamentals:partition [2023/03/30 02:30] (当前版本) – 移除 codinghare | ||
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| - | ====Partition in Liunx==== | ||
| - | ===== ===== | ||
| - | ===Hardrive format in Linux=== | ||
| - | For SATA, USB, SAS, these type of devices are showing in Linux like: | ||
| - | < | ||
| - | the //a// after// sd// indicates the currently number of harddisk. The order of these number is only associate with the computer checking sequence for harddrives. First is a , then b... | ||
| - | For older IDE, the old version of Linux call them: | ||
| - | < | ||
| - | Since IDE harddrives is no longer used in new generation computers, some new version Linux just put them into **sd** aslo. | ||
| - | ===Other devices format === | ||
| - | ^ Devices | ||
| - | |SCSI / SAS / USB / SATA | / | ||
| - | |IDE| / | ||
| - | |Virtual I/ | ||
| - | |Floppy Disk | / | ||
| - | |Printer | / | ||
| - | |Mouse | / | ||
| - | |CD/DVD ROM | / | ||
| - | \\ | ||
| - | For more devices name: [[https:// | ||
| - | |||
| - | |||
| - | ===MBR=== | ||
| - | MBR: Master boot record\\ | ||
| - | A master boot record (MBR) is a special type of boot sector at the very beginning of partitioned computer mass storage devices like fixed disks or removable drives intended for use with IBM PC-compatible systems and beyond. The concept of MBRs was publicly introduced in 1983 with PC DOS 2.0.\\ | ||
| - | MBR infos are usually stored at the first sector of hardrive. It take space of one sector(usually 512Bytes). In this space, there are two mainly data are stored in it: | ||
| - | * MBR (446Bytes in classic MBR) | ||
| - | * Partition Table(64 Bytes, Divided into 4 parts) | ||
| - | So partition in Liunx usually is shown like:< | ||
| - | |||
| - | ==Primary Partition== | ||
| - | A primary partition contains one file system. In DOS and all early versions of Microsoft Windows systems, Microsoft required what it called the system partition to be the first partition. | ||
| - | ==Extended Partition== | ||
| - | Partition is used for keeping data safe by separating sectors into different range. Because Partition table only supports 4 partitions, for getting more partitions, people use a record called** extended boot record (EBR)** to create a new partition that we called Extended partition.In Extended Partition, the space could be divided into 4 or more pieces. Each pieces is called **Logical partition**. Extended partition response for recording partition table for each logical partition. | ||
| - | \\ | ||
| - | {{ : | ||
| - | |||
| - | ==Devices Numbers== | ||
| - | In MBR, the frist 4 numbers are reserved by primary partition and extended partition. Thus, the devices for partition should be like this: | ||
| - | < | ||
| - | / | ||
| - | <WRAP center round info 100%> | ||
| - | sda[1-4] are fully reserved by primary partition and extended partition even they don't exist. Thus the number of logical partition has to start from number 5. Only **one** extended partition could exist at the same time. | ||
| - | </ | ||
| - | <WRAP center round important 100%> | ||
| - | Never combine Primary partition and Logical partition into a new partition, because it will damage partition record in extended partition. Extended partition usually store partition info at the beginning of each logical partition. | ||
| - | </ | ||
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