Retrieve Really hard Disk Lost Data Raiders Tutorial 2 Raiders, Tutorials, Hard Disks, Data Retrieve

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Difficult disk partition structure

So that you can facilitate the operating technique to access the partition parameters of your challenging disk during the startup approach, the relevant data of your partition is stored inside a unique storage space named the master boot sector (MBR), which can be stored within the hard disk 0 head 0 cylinder 1 fan Region. The principle boot sector reserves 64 bytes of storage space for the partition information, and the data of each and every partition occupies 16 bytes of storage space. The really hard disk partition information is affected by the truth that only four partition information can be stored inside the main boot sector, so a mixed partition data storage structure is adopted. This mixed partition data structure consists of your following three components:

1. The partition data of the major partition is stored in the primary boot sector and is generally the very first item within the partition table data. Contemplating the wide range of applications, the primary partition is generally an active partition.

2. According to user needs, an extended partition is often established. The data related for the extended partition can also be stored in the most important boot sector. The extended partition is really a pointer towards the subsequent partition on the technique, which is, the location with the next logical disk.

three. Depending on whether an extended partition has been established, the technique allows two to 3 non-DOS partitions to be established for storage and management locations of other operating systems.

Based on the structure on the partition, we know that the parameters from the above three varieties of partitions are stored within the partition table of your most important boot sector. These parameters consist of the head on the partition, cylinder, sector, as well as the head, cylinder, and fan of the finish of the partition Zone parameters, also as the kind of the partition and regardless of whether it truly is an active partition, are information that happen to be important towards the partition. For the primary partition and non-DOS partition, these parameters will be the actual parameters with the partition. For the extended partition, the beginning physical address in the extended partition is really the storage physical address with the information of one more partition table. Based on how to recover deleted folder from external hard drive of logical disks developed inside the extended partition, the exact same volume of partition data might be generated accordingly. For example, assuming that 3 logical disks are produced within the extended partition of a physical disk, the starting partition address in the very first logical disk could be located within the partition table stored within the primary boot sector; Two partition data will probably be stored in the starting physical address, one would be the partition information on the present logical disk, plus the other is the starting partition address pointing for the next logical disk. In other words, every single logical disk really features a partition boot sector, as well as the partition boot sector shops the physical addresses of your boot sectors of your present partition along with the next partition. If only the physical address with the present partition is stored within the boot sector from the partition, and there's no physical address on the next partition, it means that the existing partition is definitely the last logical disk. Thus, we get in touch with this a linked list of pointers that provides the subsequent partition address item by item as a linked list of partition structures.

The partition information storage structure like four logical disks is shown in the figure.

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2010-7-319: 40 In accordance with the connection involving the partition and logical disk structure explained inside the above figure, it can be not tough to draw such a conclusion: the logical disk is really an independent partition, but the parameters in the partition will not be stored in the principal boot sector As an alternative, it truly is stored within the initial sector of every partition. By means of the extended partition parameters stored within the main boot sector, the partition parameters of the logical disk might be accessed one by one in the kind of a one-way linked list.

Use actual partition data to know the storage structure of disk parameters

Below we use a set of actual information to demonstrate the above partition structure theory. The relevant information is shown within the figure.

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2010-7-319: 40 In accordance with the data supplied inside the figure, the partition table information stored in the main boot sector (0 head 0 cylinder 1 sector) indicates that the physical hard disk is divided into two regions, of which the initial partition would be the main partition ( The partition type flag is 06H) and it is actually an active partition. The second partition is an extended partition (partition type flag is 05H), and also the storage address from the next partition table information is 0 head F4H cylinder (ie 244 cylinder) 1 sector. Use assembly language system to read the information of 0 head F4H cylinder 1 sector, and located that the data structure of its partition table is exactly the identical as the key boot sector, but there is no partition boot program portion, except for the partition table information, the rest of your data are 0 . The partition table data stored within the boot sector of your second partition indicates that the partition starts from sector 1 around the head F4H cylinder, which is the place of your logical sector 0 of your partition, plus the partition flag (06H) indicates that the corresponding partition will be the major partition, the subsequent partition starts from the 0 head 1ABH (ie 427) cylinder (the cylinder parameters are ten bits in total, where the 9th and 10th bits are supplied by the highest two bits from the previous byte) 1 sector, which can be the extended partition . By analogy, it is possible to obtain the data of each and every partition or logical disk in order by the data from the initially extended partition. The partition table data stored in sector 1 of cylinder 0 head 262H (ie 610) indicates that this partition will be the last partition.

In accordance with the partition information truly stored on the difficult disk offered inside the above figure, it is not difficult to draw the conclusion that the tough disk has two partitions, of which the primary partition constitutes the logical C disk, plus the extended partition constitutes the D, E, and F logical disks.

So far, we have understood the principles of really hard disk partitions and logical disks, and have mastered the information storage structure of partitions. By grasping the information storage structure in the partition, it assists us have an understanding of the significance of information recovery.