Windows2000 of the secret Weapon (i)

1. Expand the structure of the partition and logical volume background knowledge

A physical hard disk can have more than one partition, a simpler and more commonly used scenario is to first partition part of the space into primary partitions, and the remaining space as an extended partition. Early hard drives were small in size, and there was a scenario where the entire hard disk was used as a primary partition. In either case, one must be clear: 0 Cylinder 0 Heads (disk surface), that is, all 0 tracks on which disk surface of the 0 head (regardless of how many sectors the track is divided into) are not part of any partition, that is to say, this is an area reserved by the system, and this part of the area is hidden, In this reserved area, there is only one master boot record. The general primary partition is then hidden to create the area. Then the primary partition is then established, which is the extended partition.

Strictly speaking, no matter which type of partition, can not be directly used by the operating system, you need to establish at least one or more "logical volumes" in the partition----This is certainly the foreigner salutation method, we generally call it "logical drive". After dividing the logical drive, you can format it, regardless of whether the primary partition or extended partition should do so! This is the only way. To install the operating system or to be used by the system.

Furthermore, partitioned tables, whether primary partitions or extended partitions, and logical drives, are divided and represented using partitioned tables. Thus there is a partitioned table of its own, all partitioned tables are represented by a "backward connection", that is, in addition to storing the current partition information in the partition table of the current partition or logical drive, you must also store a partitioned table with adjacent next partition (or logical drive). That is, any partition or logical drive must "know" the exact location of the next partition adjacent to it. If the partition itself is the last partition, only information that represents its own partition is stored. For example, attached to the end of this article is a diagram of partitioned table structure that divides an extended partition into 3 logical drives: As you can see from the diagram, each logical drive has four locations reserved for the partitioned table, but the first two is actually used in the extended partition, the second is the current partition, and the next is the partition. This is also true for the second logical drive. To the last one, only the first partition table is used.

Each logical drive has its own boot sector, which, in the DOS era, is simply called a DOS boot sector. Note that this sector is not a duplicate of the primary boot sector that the physical hard disk retains, but is controlled by the operating system. At the end of this boot sector, 0X55AA is also used as a flag to guide success.

2. How to show the basics of all partitions

A. In Windows2000, you can also display all partitions without using the Support tool tool, and you can turn on Computer Management from the control Panel, which has disk management, and the mouse clicks to display the partitions of all the disks.

I opened it on my own machine as shown in the figure above. However, this approach is open with little information and cannot be edited.

B. Display and edit extended partition information with the DiskProbe tool. How to open the DiskProbe tool, the first two parts have described the process of operation in detail. Here's just a new problem: When you open diskprobe, you want to show the extended partition, you must select a logical volume (drive). You can click on the "Drive-> logical Volume (drive)" menu and display a selection dialog box to allow you to choose the logical drive.

On the left side of the scroll bar of the dialog box, list the logical drives that you can select, by double-clicking one of them with the mouse, and then clicking the OK button.

To select the starting sector and number of sectors to read, on the Sectors menu, click Read to appear in the dialog box that allows you to select the number of sectors and sectors to start;

Generally use the default values shown, and click the Read button without making changes.

The next screen shown is shown in Figure 4;

The information, along with the boot sector, is displayed in bytes. This is not intuitive, especially for those with less experience, who are likely to not understand it at all. Need to change the display mode, you can click on the View menu partition table, the display of the picture you have seen before, here will not repeat the illustrations. If you want to modify the extended partition information, you can simply enter the appropriate number in the edit box.