Partition - The division of a hard disk into separated sections. Each partition appears as a separate, independent hard drive. Partitioning a hard drive can be especially convenient to those who run multiple operating systems. You can run Windows in one partition and UNIX in another.

PC - Acronym for Personal Computer. Normally refers to computers running Windows with a Pentium processor. The term "PC" is often mistakenly used to refer only to a computer running Microsoft Windows operating system. Macintosh computer running Mac OS and an IBM PC compatible running Linux are both personal computers as well.

PCB - Acronym for a printed insulated board where interconnected circuits and

Personal Digital Assistant (PDA) - A handheld portable computer that is used as a digital organizer. PDAs can store information such as daily appointments and phone numbers and offer various features such as a calculator, calendar, computer games, alarm clock, and more. Over the years PDAs have become more and more sophisticated and handy as they have been used to access the Internet and video record.

PDF - Portable Document Format. A file format presented by Adobe Acrobat which allows documents to be accessed by different operating systems.

Physical Recovery - The work performed directly on the damaged unit. The idea is to transfer as much data as possible to a functional storage unit.

Port - Specific place for being physically connected to some other device

Program - A specific set of commands written in a computer language that tells the computer what tasks to perform and how to do it. Programs are also known as “software” or “applications.”

RAID - Acronym for Redundant Array of Inexpensive/Independent Drives (or disks). The idea behind RAID is to spread data across multiple hard drives that act as one. There are different levels of RAID (RAID-0,1,2,3,4,and 5) and two different techniques by which they share data:
Disk Striping: storing a little bit of data across a number of hard disks.
Disk Mirroring: storing a copy of information on another disc so in an event of a hard disk crash, the data remains accessible.

RAID 0 - Speed (Widely Used)
RAID level 0 strips data across multiple disks. RAID 0 is very risky in case of a failure. If one of the hard drives crashes, the whole data is at risk.

RAID 1 - Fault Tolerance (Widely Used)
Uses disk mirroring, which duplicates the entire data. RAID 1 is extremely reliable in terms of data protections and, therefore, commonly used for business purposes.

RAID 2 - Speed
Instead of single bytes or groups of bytes (blocks), bits are striped across many disks. This type of RAID is rarely used since 39 disks are required.

RAID 3 - Speed and Fault Tolerance
Data are striped across three or more hard disk drives. All hard drives operate in parallel and therefore it is a very reliable type of RAID.

RAID 4 - Speed and Fault Tolerance
Similar to RAID 3, however, uses block level striping. Not commonly used.

RAID 5 - Speed and Fault Tolerance (Widely Used)
Data are striped at the byte level across three or more hard disk drives for performance as well as fault tolerance. RAID 5 is commonly used in servers.

RAM - Random Access Memory. One of two basic types of information storage used by computers. The operating system, various segment of programs, and data in current use are stored in the RAM so they can be quickly accessed by the computer’s processor. Nevertheless, the data in RAM is kept there only as long as the computer is running. When the computer is turned off, the RAM loses its data.

Right-Click - Using the right mouse button to display drop-down menus.

ROM - (Read Only Memory) One of two basic types of information storage used by computers. The data stored in ROM is permanent and cannot be changed.