What is fat in the file system?July 05, 2020 by Charles Avitia
If you get the error “what is shown in bold in the file system”, this article was created to help you. NTFS is the most advanced file system. Windows uses NTFS for its system drive and, by default, for most non-removable drives. FAT32 is an old file system that is not as efficient as NTFS and does not support a wide range of functions, but provides better compatibility with other operating systems.
The FAT file system was originally used on PC operating systems such as MS-DOS and earlier versions of Microsoft Windows. However, it is often used on USB sticks or memory cards to store files. It is simple, reliable, and works well, especially in integrated applications.
FAT stands for File Allocation Table. This table contains the index of the system file and is assigned statically when formatting the disk. It contains an entry for each cluster (data storage area). FAT records contain the number of the next cluster in the file or a marker that indicates EOF (end of file), unused space, or other specially reserved areas of the disk. The root directory of the disk contains the number of the first cluster of each file in the directory. The operating system scans the FAT table and looks for the cluster number of each subsequent part of the file to the end of the file. Similarly, subdirectories are implemented as special files that contain directory entries for their respective files.
Since the first implementation, the maximum number of clusters per diske increased significantly, increasing the number of bits used to identify each cluster. Versions of the FAT format are named according to the number of bits of the table elements: FAT12, FAT16 and FAT32. Each of these options is supported by a file system component.
The volume label for volumes FAT12, FAT16, or FAT32 can contain up to 11 characters and must not contain the following characters: *? / \ | ,; : + = <>  "".
Absolute And Relative Path
The file system component comes with the library and supports long (LFN) and short (SFN or 8.3) file names. Since there is no mandatory algorithm for creating the 8.3 name from LFN, the file system component uses the convention described below.
To use the time information provided by the PSTN on the chip, the user application must implement the fs_get_time () function. The fsTime structure must be populated with the data returned by the RTC driver. If the fs_get_time () function is not implemented in the user application (this is the default setting), predefined timestamps are used.
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