Alan Freedman -- The Computer Language Company - Computer Desktop Encyclopedia
Computer Desktop Encyclopedia
Longest-Running Tech Reference on the Planet

A CDE Definition

You'll love The Computer Desktop Encyclopedia (CDE) for Tech Term of the Day (TTOD)



(1) A reasonable solution to a problem.

(2) A higher level view of an object; for example, the user's view versus the computer's view. See logical vs. physical.

logical vs. physical

High-level versus low-level. Logical implies a higher view than the physical. Users relate to data logically by data element name; however, the actual fields of data are physically located in sectors on a disk. For example, to find out which customers ordered how many of a particular product, the logical view is customer name and quantity. Its physical organization might have customer name in a customer file and quantity in an order file cross referenced by customer number. The physical sequence of the customer file could be indexed, while the sequence of the order file could be sequential.

Logically From Phoenix to Boston
A message transmitted from Phoenix to Boston logically goes from one city to the other; however, the physical telephone circuit could be Phoenix to Chicago to Philadelphia to Boston. Over the Internet, the message could traverse switching points in many other locations.

Logical Drive C: - Physical Drive 0
In a Windows PC, a single physical hard drive is drive 0; however, it may be partitioned into several logical drives, such as C:, D: and E:. See partition.

Various virtualization methods create a logical "abstraction layer" for dealing with the physical hardware. For example, virtual machines enable multiple operating systems to run in the computer, each accessing the hardware via a logic layer rather than direct physical contact. See virtualization and virtual machine. See logical vs. physical topology.

Personal Use Only

Before/After Your Search Term
logic errorlogical access
logic functionlogical access point
logic gatelogical backup
logic ICLogical Block Addressing
logic onelogical bomb
logic operationlogical data group
logic-seeking printerlogical design
logic sequencerlogical device
logic synthesislogical drive
logic zerological expression

Terms By Topic
Click any of the following categories for a list of fundamental terms.
Computer Words You Gotta KnowSystem design
Job categoriesUnix/Linux
Interesting stuffPersonal computers
InternetIndustrial Automation/Process Control
Communications & networkingAssociations/Standards organizations
HistoryDesktop publishing
ProgrammingHealthcare IT
System design