Data Recovery Glossary

JBOD to Jumper

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




JBOD (Just a Bunch Of Disks) - see spanned volume.


JFS (Journaled File System) - 64-bit journaling filesystem designed by IBM.

Journal replay

Journal replay - the process of re-doing operations marked as unfinished in a filesystem log file to restore a filesystem consistency. Journal replay is performed every time the filesystem is mounted in journaling filesystems, such as NTFS or ext.

Journaling filesystem

Journaling filesystem - the filesystem which uses a journal (also called log file or intention log) to track a list of scheduled and completed operations. Journaling allows maintaining filesystem integrity without time-consuming integrity checks.


Jumper - a small clip used to specify a mode of device operation by shorting or breaking some specific circuit. Jumpers are often grouped into blocks to allow selecting one of the operating modes. Jumpers are typically used to:

  1. reset the BIOS settings,
  2. force hard drives to report smaller than the actual capacity to the host system for compatibility reasons (so called capacity clipping),
  3. switch hard drives using SATA II to SATA I to provide compatibility with SATA I controllers,
  4. select Master/Slave mode on the Parallel ATA (IDE) disks.

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