31, May 2017: NTFS is a journaling file system and uses the NTFS Log ($LogFile) to record metadata changes to the volume. It is a feature that FAT does not provide and critical for NTFS to ensure that its complex internal data structures will remain consistent in case of system crashes or data moves performed by the defragmentation API, and allow easy rollback of uncommitted changes to these critical data structures when the volume is remounted. Notably affected structures are the volume allocation bitmap, modifications to MFT records such as moves of some variable-length attributes stored in MFT records and attribute lists, and indices for directories and security descriptors.
Use "unformat" to recover formatted ntfs partition externl hard drive after quick format, full format, accidentally formatted, reformatting, High-level formatting, Low-level formatting.
Use "recover partition" to recover data from deleted ntfs partition external hard drive
lost ntfs partition, changed ntfs partition, damaged ntfs partition external hard drive.And if the size or position of ntfs partition is changed by format, It can not recover with "unformat", so you can use "recover partition" mode.
Use "undelete" to recover deleted files from ntfs partition external hard drive after Virus attack, Recycle bin clear, disk cleanup, Press shift del by mistake, permanently empty recycle bin, shift delete, accidentally deleted by a mistake.
Use "Full Scan" to recover files which can not be found with "undelete" and "unformat" and "recover partition" after showing an error, display as raw file system, unformatted, unknown partition, unpartitioned, needs to be formatted.
In NTFS, all file, directory and metafile data file name, creation date, access permissions (by the use of access control lists), and size are stored as metadata in the Master File Table (MFT). This abstract approach allowed easy addition of file system features during Windows NT's development an example is the addition of fields for indexing used by the Active Directory software. This also enables fast file search software such as Everything to locate named local files and folders included in the MFT very quickly, without requiring any other index.
The MFT structure supports algorithms which minimize disk fragmentation. A directory entry consists of a filename and a "file ID", which is the record number representing the file in the Master File Table. The file ID also contains a reuse count to detect stale references. While this strongly resembles the W_FID of Files-11, other NTFS structures radically differ.
Data recovery is often performed by specialized commercial services that have developed often proprietary methods to recover data from physically damaged media. Service costs at data recovery labs are usually dependent on type of damage and type of storage medium, as well as the required security or cleanroom procedures.
File system corruption can frequently be repaired by the user or the system administrator. For example, a deleted file is typically not immediately overwritten on disk, but more often simply has its entry deleted from the file system index. In such a case, the deletion can be easily reversed.
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