Data Recovery Glossary

RAID to Resident File

Data Recovery Glossary home

List of pages

A - Access Rights to ASCII

B - Backup to BTRFS

C - CANON_DC to Cross-linked Files

D - DAS to Dynamic Disk

E - ECC to External Hard Drive

F - Failed Disk to fsck

G - Gigabyte to GUID

H - Hard Drive to Hybrid Disk

I - IDE to Internal Drive

J - JBOD to Jumper

L - LBA to LVM

M - Megabyte to Motherboard

N - NAS to Nuke & Pave

O - Operator Error to Overwritten Data

P - Parallel ATA to PSU

Q - QNAP to Quota

R - RAID to Resident File

S - SAS to Synology Hybrid RAID

T - Tailpacking to TrueCrypt

U - UDMA to USB Thumbdrive

W - WD to Write-Through Cache




RAID (Redundant Array of Inexpensive Disks) - a device to store a large amount of data. It consists of several hard drives combined into a single logical device.

RAID controller

RAID controller - a circuit board which manages a RAID array.

RAID level

RAID level - the RAID type, defining a data layout. There are arrays providing a redundancy (e.g. RAID 1, RAID 5, RAID 6) and non-redundant (RAID 0 and JBOD).

RAID parameters

RAID parameters - the set of characteristics which describes a disk array. The set includes:

  • disk order,
  • array type (RAID level),
  • block size,
  • parity position,
  • data ordering on disks.

RAID recovery

RAID recovery - array configuration recovery after some failure (can be done either manually or automatically using software).

RAID5 or RAID6 rebuild

RAID5 or RAID6 rebuild - a process of parity and data recalculations in RAID5 or RAID6 after one of the disks was replaced.


RAM (Random Access Memory) - the type of fast volatile memory used for a short-term storage. The programs and data they work with are loaded to RAM to be executed. Faulty RAM often causes damage to a filesystem structures and data on the hard drives by corrupting the content of data buffers during write.

RAW filesystem

RAW filesystem - used to refer to the invalid filesystem when talking about the drive that either got damaged to the point a filesystem cannot be recognized, or that was never formatted.


Reallocation (remapping) - the process of reassigning hard drive sectors. It is used if a bad sector is found on a storage device. The less bad sectors, the better.

Reed-Solomon code

Reed-Solomon code - cyclic non-binary code which allows correcting errors in data blocks. Reed-Solomon code is a variant of ECC.


ReFS (Resilient File System) - a new filesystem introduced in Windows 8 Server. It was designed to handle large storage and large number of files. ReFS can be used only for internal, non-removable disks. The developers planned that ReFS wouldn't fail but in practice you still can face data loss in ReFS - read more about ReFS recovery.

Resident file

Resident file - file for which the data is stored in the MFT of NTFS filesystem.

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