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
X - X-RAID2
Z - ZFS
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OpenZFS
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
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:
Overclocking
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
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
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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