Data Recovery Glossary

UDMA to USB Thumbdrive

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




UDMA (Ultra DMA) - the improvement of DMA technology, reducing CPU usage during read/write operations with a hard drive.


UFS (UNIX File System) - the filesystem used in UNIX, Linux and older MacOS versions.

Unallocated space

Unallocated space - a hard drive space which doesn't belong to any filesystem or partition.

Undelete (unerase)

Undelete (unerase) - a recovery of files after an accidental deletion.


Unformat - data recovery after a storage device has been formatted.


Unicode - the standard of symbol encoding which allows representing characters of almost all languages. In Unicode, 16 bits are used to represent the symbol.


USB (Universal Serial Bus) - the standard on the connector and on the method of data transfer. There are three versions in use: USB 1.1, USB 2.0 and USB 3.0. USB is used to connect various slow and medium-speed devices. Only USB 2.0 and USB 3.0 with bandwidth from 40 to 400 Mb/sec should be used for data recovery.

USB enclosure

USB enclosure (also called USB box) - a device to connect hard drive to a computer via a USB port.

USB thumbdrive

See Thumbdrive.

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