Search results
Results From The WOW.Com Content Network
In computer file systems, a cluster (sometimes also called allocation unit or block) is a unit of disk space allocation for files and directories.To reduce the overhead of managing on-disk data structures, the filesystem does not allocate individual disk sectors by default, but contiguous groups of sectors, called clusters.
Linux, BSD, [1] [2] ReactOS, [3] Windows (through an IFS), macOS (through FUSE), HelenOS, [4] RIOT, [5] Zephyr [6] ext2 , or second extended file system , is a file system for the Linux kernel . It was initially designed by French software developer Rémy Card as a replacement for the extended file system (ext).
ext4 (fourth extended filesystem) is a journaling file system for Linux, developed as the successor to ext3.. ext4 was initially a series of backward-compatible extensions to ext3, many of them originally developed by Cluster File Systems for the Lustre file system between 2003 and 2006, meant to extend storage limits and add other performance improvements. [4]
The compression algorithm is designed to support cluster sizes of up to 4 KB; when the cluster size is greater than 4 KB on an NTFS volume, NTFS compression is not available. [69] Data is compressed in 16-cluster chunks (up to 64 KB in size); if the compression reduces 64 KB of data to 60 KB or less, NTFS treats the unneeded 4 KB pages like ...
Valid data length (VDL): through the use of two distinct lengths fields – one for "allocated space" and the other for "valid data" – exFAT can preallocate a file without leaking data that was previously on-disk. Cluster size up to 32 MB. [15] Metadata integrity with checksums. [clarification needed] Template-based metadata structures.
IBM OS/360 and successors allocate files in multiples of disk tracks or cylinders. Files could originally have up to 16 extents, but this restriction has since been lifted. The initial allocation size, and the size of additional extents to be allocated if required, are specified by the user via Job Control Language. The system attempts to ...
Linux, BSD, ReactOS, [2] Windows (through an IFS) ext3 , or third extended filesystem , is a journaled file system that is commonly used with the Linux kernel . It used to be the default file system for many popular Linux distributions but generally has been supplanted by its successor version ext4 . [ 3 ]
File Allocation Table (FAT) is a file system developed for personal computers and was the default file system for the MS-DOS and Windows 9x operating systems. [citation needed] Originally developed in 1977 for use on floppy disks, it was adapted for use on hard disks and other devices.