The four basic methods of organizing files on a disk are: File Allocation Table (FAT): This method uses a table to keep track of the locations of files on the disk, allowing for efficient access and management. Indexed Allocation: This approach creates an index block that contains pointers to the actual disk locations of file data, facilitating quick access and management of fragmented files. Contiguous Allocation: In this method, files are stored in contiguous blocks, which enhances performance due to reduced seek time, but can lead to fragmentation over time. Linked Allocation: This technique links blocks of a file using pointers, allowing for dynamic file growth, but may result in slower access times due to non-contiguous storage.
sequence file system index file system main file system sequence index file system
Continuous File Allocation - uses continuous range of blocks in logical block space Chained File Allocation - each block pointer to the next on disk
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Contiguous Allocation Linked Allocation Indexed Allocation
another name for a file allocation unit is a cluster.
index file is organized with the help of any key as index number at rondomly but index sequencial file organized with the help of any index sequentialy rajesh patel
The index of files on a disk, commonly referred to as the file allocation table (FAT) or the master file table (MFT) in NTFS systems, is typically stored in a reserved area of the disk. This index keeps track of the locations and attributes of files, allowing the operating system to efficiently manage data retrieval and storage. It is crucial for organizing the file system and ensuring quick access to files. This index is often located at specific sectors on the disk, depending on the file system being used.
DOS allocates files using a File Allocation Table (FAT), which keeps track of which clusters on the disk are occupied and which are free. When a file is created, DOS finds free clusters, marks them as used in the FAT, and links them together to form a chain that represents the file's location on the disk. This method allows for efficient space management and retrieval of files, but can lead to fragmentation over time as files are created and deleted. The allocation process is primarily sequential, favoring contiguous space when possible.
file allocation table
File allocation table
FAT is a file system used by MS-DOS and other Windows-based operating systems to organize and manage files. The file allocation table (FAT) is a data structure that Windows creates when you format a volume by using the FAT or FAT32 file systems. Windows stores information about each file in the FAT so that it can retrieve the file later.