RAID
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
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
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
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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