In order to facilitate access to the hard disk partition parameter operating system during start up the related data storage partitions the main boot sector in a known (MBR) special storage space, which is stored in the hard disk of the 0 sector 1 of cylinder head 0. Master boot sector partition data retention for 64 bytes of storage space, storage space for each partition occupies 16 bytes of data. Hard disk partition data because of the influence of accept or guide only storage sector 4 partition data, it uses a partition data mixed structure preservation, and partition data structure of this hybrid consists of the following 3 parts:
1. Primary partitions data stored in the master boot sector, and is usually the first data in the partition table. Considering the wide application, the primary partitions are usually active partition.
2. According to the user need, can create an extended partition. Extended data partition is also stored in the master boot sector. An extended partition is actually a pointer, which points to the system under a partition, is also the position of the next logical disk
3. According to whether have established an extended partition, system to allow the establishment of 2 ~ 3 Non -DOS partition, for the establishment of other operating system storage and management area.
According to the partition of the structure, we know that in the MBR partition table stored in the above 3 types of partition parameters, these parameters including partition starting head, cylinder, head, sector and partition the end of cylindrical, sector parameters, as well as the type of partition and whether the active partition to partition the crucial data. For the main partition and non - DOS partition speaking, these parameters is to partition the actual. But for the extended partition, the partition initial physical address is actually another partition table data storage physical address. According to the number of extended logic disk set partitioning in the corresponding partition data, will produce the same number of. For example, assume that a physical disk partition is established in 3 logical disk partitions, the starting address is stored in the master boot sector of the partition table can be found in the first logical disks; while in the initial physical address will be stored in the first logical disk two partition data, one is to partition the data current logic disk, another is to point to the start address of the next logical disk partitions. That is every logical disk.
In fact, there is a partition boot sector, the physical address of the partition boot sector, stores the current partition and a partition boot sector. If the partition boot sector of the physical address containing only the current partition, not the physical address of a partition, said the current partition is the last logical disk. So, we call list partitioning address pointer list for a partition structure of this item by item gives the next.
Include the partition data storage structure of 4 logical disks as shown in fig.
According to the relationship between partitions and logical disk structure described above, it is not difficult to draw the conclusion: the logical disk is actually a separate partition, partition of the parameter is not only stored in the master boot sector, but stored first sector in each partition. By storing the extended partition parameters in the main boot sector, according to one-way linked list can individually access to logical disk partition parameter.
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1. Primary partitions data stored in the master boot sector, and is usually the first data in the partition table. Considering the wide application, the primary partitions are usually active partition.
2. According to the user need, can create an extended partition. Extended data partition is also stored in the master boot sector. An extended partition is actually a pointer, which points to the system under a partition, is also the position of the next logical disk
3. According to whether have established an extended partition, system to allow the establishment of 2 ~ 3 Non -DOS partition, for the establishment of other operating system storage and management area.
According to the partition of the structure, we know that in the MBR partition table stored in the above 3 types of partition parameters, these parameters including partition starting head, cylinder, head, sector and partition the end of cylindrical, sector parameters, as well as the type of partition and whether the active partition to partition the crucial data. For the main partition and non - DOS partition speaking, these parameters is to partition the actual. But for the extended partition, the partition initial physical address is actually another partition table data storage physical address. According to the number of extended logic disk set partitioning in the corresponding partition data, will produce the same number of. For example, assume that a physical disk partition is established in 3 logical disk partitions, the starting address is stored in the master boot sector of the partition table can be found in the first logical disks; while in the initial physical address will be stored in the first logical disk two partition data, one is to partition the data current logic disk, another is to point to the start address of the next logical disk partitions. That is every logical disk.
In fact, there is a partition boot sector, the physical address of the partition boot sector, stores the current partition and a partition boot sector. If the partition boot sector of the physical address containing only the current partition, not the physical address of a partition, said the current partition is the last logical disk. So, we call list partitioning address pointer list for a partition structure of this item by item gives the next.
Include the partition data storage structure of 4 logical disks as shown in fig.
According to the relationship between partitions and logical disk structure described above, it is not difficult to draw the conclusion: the logical disk is actually a separate partition, partition of the parameter is not only stored in the master boot sector, but stored first sector in each partition. By storing the extended partition parameters in the main boot sector, according to one-way linked list can individually access to logical disk partition parameter.
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