Summary of Windows NT NTFS and FTDisk Data RecoveryLast reviewed: April 18, 1995Article ID: Q129038 |
The information in this article applies to:
SUMMARYFtDisk, the Windows NT fault tolerant driver, provides the mechanisms for redundant data storage, volume management, and dynamic data recovery.
MORE INFORMATIONDynamic data recovery is only available on SCSI drives. FtDisk works between the physical disk drivers and the file system drivers, and works with all the supported files systems (FAT, HPFS, and NTFS). Windows NT file system (NTFS) is the only file system with built-in data recovery mechanisms. The table below lists the data recovery options available when you have FtDisk installed on an NTFS drive.
SCSI Drive with Non-SCSI drive or Any type of spare sectors no spare sectors disk drive
Fault 1. FtDisk can 1. FtDisk can N/A Tolerant recover data recover data Volume 2. FtDisk uses 2. FtDisk sends data sector sparing and a bad-sector (replaces sector) error to the file system 3. File system is 3. NTFS performs unaware of cluster remapping the error Non-Fault 1. FtDisk cannot 1. FtDisk cannot 1. Disk driver Tolerant recover data recover data returns bad Volume sector error to file system 2. FtDisk sends 2. FtDisk sends 2. NTFS performs bad-sector error bad-sector error cluster remapping to file system to file system 3. NTFS performs 3. NTFS performs cluster remapping cluster remapping DATA IS LOST DATA IS LOST DATA IS LOST Fault tolerant volumes include mirror sets (RAID 1) and stripe sets with parity (RAID 5). Note: If FtDisk finds a bad sector on a fault tolerant volume, and the physical disk supports spare sectors, and has spare sectors available, FtDisk replaces the sector. This is true for all tree supported file systems (FAT, HPFS, and NTFS); the file system remains unaware of this mechanism. For more information on NTFS, see "Inside the Windows NT File System" by Helen Custer.
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