Data Recovery Glossary


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




LBA (Logical Block Addressing) - the method of addressing a sector on a hard drive. The original implementation of LBA used 28 bits for the address, allowing a maximum hard drive size of 128GB with 512-byte sectors.


LBA48 - the variation of LBA which uses 48 bits for a sector address. It allows using disks larger than 128GB (137 decimal gigabytes) without increasing the sector size.


LDM (Local Disk Manager) - Windows component which works with dynamic disks and software RAIDs.

Log file

Log file - see Journaling filesystem.

Logical damage

Logical damage - failures not related to mechanical damage of the system components. It can be either a filesystem failure or a failure of RAID controlling software.

Logical drive

A part of the Extended Partition in MBR (basic) disks.

Lost clusters

Lost clusters - a filesystem error when a cluster is marked as occupied but it doesn't belong to any file.

Low level format

Low level format, also known as "complete format" - a type of the format process when data is deleted irreversibly (it is impossible to recover overwritten data).


LUN (Logical Unit Number) - a part of device address in the SCSI standard.


LVM (Logical Volume Manager) - a partitioning technology used in Linux. LVM allows one to change partition sizes easily.

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