Shulou(Shulou.com)06/02 Report--

Hard disk

First of all, the hard disk is a physical storage medium, whether it is the previous mechanical hard disk (stored through magnetic materials) or the current solid-state hard disk (storing data through a transistor), it stores binary bit strings; the data stored on the hard disk is processed by the operating system and then presented in our eyes, what we see are partitions (C disk, D disk, / root, / opt, / lib, etc.) and directories in the partition. These partitions are logical structures, and there are no partitions on the hard disk. Partition maintenance is realized through partition tables. The data recorded in the partition table is similar to: 0x00000129-0x00010000 C disk. The files are first stored on the physical disk. Secondly, the physical location of the file storage and the file information (file name, size, modification time, etc.) are stored in a table structure similar to the partition table. Is the logical data that the operating system reads the partition table and then presents it. The file we see is displayed by the operating system by reading the corresponding file control block under the partition.

CHKDSK

Chkdsk is developed by Microsoft to check the logical integrity of files under the partition; in addition, it can also solve the problem that the partition cannot be opened due to the damage of the file control block in the partition. This article focuses on how to solve the problem that the partition cannot be opened, and why.

Applicable scenario 1. When opening the partition, the prompt: "the file or directory is corrupted, unable to open D: disk"; 2. Some files can not be opened; repair method chkdsk [partition] / f principle chkdsk by checking the corresponding file control block information in the partition table to find the file (reading the physical disk), delete the error file control block, and then correct the data in the partition table, thus solving the problem that the partition can not be opened. Note 1. When running chkdsk / f, do not interrupt the process; this is because chkdsk will rebuild data such as partition tables, and if you interrupt the process, it may lead to errors in partition tables and file control blocks, resulting in the loss of hard disk files (invisible, but still stored on the hard disk). 2. For partitions detected by chkdsk, make sure that no files are manipulated in the partition, because when chkdsk is running, the file controls the data in the physical location of the block and clears the reference count of the file, resulting in file exceptions. 3. Chkdsk is related to the format of the partition

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