Data Recovery Glossary

Operator Error to Overwritten Data

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




OpenZFS is an open-source project developing a storage platfrom based on the ZFS filesystem.

Operator error

Operator error - class of errors caused by incorrect actions on behalf of user, as opposed to a system malfunction. Formatting of a wrong partition resulting in data loss is a typical example of an operator error.


OS (Operating System) - a set of programs allowing user to interact with a computer. OS provides user with a convenient interface hiding details of different organization levels of computer components (hard drives, CPU commands and so on). Most widely known operating systems are:

  • Windows,
  • Mac OS,
  • Linux


Overclocking - the increase of a computer speed above a vendor-certified standard by changing the system settings. The typical side effect of the overclocking is the system instability.


Overhead (in disk space) - disk space which is not used to store user data, but either provides redundancy in a storage system (e.g. in RAID1 or RAID5), or is used for filesystem control structures.


Overheating - a phenomenon when a system doesn't work properly because some components (e.g. CPU, GPU, or memory) got too hot. There are certain temperature limits after which the modern semiconductors cease to function. As a rule, for a chip anything below 600C is fine, anything higher than 950C is bad, and between there is a gray "mostly OK" area. For a hard drive, everything below 550C is fine, above that you should think about improving ventilation.

Overwritten data

Overwritten data - data which has been deleted from a storage device and then new data was written onto the same storage space. It is impossible to recover overwritten data.

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