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A file is a unit of data in the file system that a user can access and manage. A file must have a unique name in its directory. It consists of one or more streams of bytes that hold a set of related data, plus a set of attributes (also called properties) that describe the file or the data within the file. The creation time of a file is an example of a file attribute.
When a file is created, one unnamed default stream is created to store all data written to the file while it is open. You can also create additional streams within the file. These additional streams are referred to as alternate streams. The following figure depicts a file with the default stream and two alternate streams.
File attributes are not stored in the data streams with the file data, but are stored elsewhere and managed by the operating system.
All file system data, including the system bootstrap code and directories, are stored by the NTFS file system in files. Other file systems store this information in disk regions external to the file system. An advantage of storing this information in files is that Windows can locate, access, and maintain the information easily. Other advantages are that each of these files may be protected by a security descriptor and, in the case of partial disk corruption, they may be quickly relocated to a safer part of the disk.
The fundamental storage unit of all supported file systems is a cluster, which is a group of sectors. This allows the file system to optimize the administration of disk data independently of the disk sector size set by the hardware disk controller. If the disk to be administered is large and large amounts of data are moved and organized in a single operation, the administrator can adjust the cluster size to accommodate this.