A logical disk is a concept from computing. Logical disks provide a certain amount of space to store data. Unlike real (called "physical") hard disks that can be touched, logical disks can take this storage space from different locations.
Common locations where this can be taken from:
The disk is described as "logical" because it does not actually exist as a single physical entity in its own right.
When IBM first released the magnetic disk drive in the 1956 (IBM 305) a single drive would be directly attached to the using system, with each disk managed as a single entity. As the development of drives continued, it became apparent that reliability was a problem and systems using RAID technology evolved. This means that more than one physical disks are "RAID-ed" together to produce a single logical disk.
In a modern home PC environment, disk drives now provide hundreds of gigabytes of storage capacity which can be impractical to use as a single entity. Therefore most systems have their drives partitioned into multiple "logical drives".
In most modern business IT environments, some form of a Storage area network will exist. Here, many storage devices are connected to many host server devices in a network. A single RAID array may provide some capacity to one server, and some capacity to another. Therefore logical disks are used to partition the available capacity and provide the amount of storage needed by each host from a common pool of logical disks.
British Rail Class 414
The British Rail Class 414 (or 2Hap) electric multiple units were built between 1956 and 1963.
British Rail Class 415
British Rail Class 415 (or 4EPB) was a suburban 750V DC third rail electric multiple unit commissioned by the Southern Region of British Railways. Built between 1951 and 1957, it became the most numerous class on the region after the withdrawal of the 4Subs. The final trains were withdrawn in the 1990s, replaced by Class 455, 456, 465 and 466
British Rail Class 416
The British Rail Class 416 (or 2EPB) electric multiple units were built between 1953 and 1956. They were intended for inner suburban passenger services on London's Southern Electric network.
British Rail Class 418
British Rail Class 418 (or 2Sap) was a class of electrical multiple unit commissioned by British Railways Southern Region. in England. The units were formed in the 1970s by simply declassifying the first class accommodation in selected 2Hap units. They were employed on inner suburban routes such as the Hounslow Loop.
Robert Green
Robert Green (born 18 January 1980) is an English football goalkeeper. He plays for Chelsea F.C.
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British Rail Class 419
The British Rail Class 419 Motor Luggage Vans (or MLV) were built from 1951-61 by BR at Eastleigh Works.
British Rail Class 421
The British Rail Class 421 (or 4Cig) electrical multiple units were built at BR York Works from 1964-1972. Units were built in two batches, and were initially introduced on services on the Brighton Main Line. Later units were introduced on services to Portsmouth. These units replaced older Southern Railway-designed units, such as the 5Bel "Brighton Belle" units, and 4Cor units. These trains were known commonly as "slam-doors".
British Rail Class 423
The British Rail Class 423 (or 4Vep) electrical multiple units were built by BR at York Works from 1967 to 1974, although the MBSOs and TSOs of the first 20, 7701-7720, were constructed at Derby Works. They feature manually opening doors next to every seating row. They were mostly found working outer suburban services in South London, and rural services in Kent and Sussex, up to 2005 when they were finally replaced by Electrostar and Desiro units.
British Rail Class 424
The British Rail Class 424 "Networker Classic" electric multiple unit (EMU) was built in 1997 by ADtranz at Derby. It was a prototype vehicle rebuilt from a Class 421 driving trailer vehicle.
Always (Sum 41 song)
"Always" is a single by Sum 41, released on their first complicity album "". It is the only new song on the record, recorded especially for this release, and was released as a radio single on December 9, 2008.<br>
Although the album was released on November 26, 2008, the song was released to the public for free listening on the Universal Japan website on November 11, 2008.
"Always" is not a typical Sum 41 song. It switches tempos back and forth during the whole song, from an acoustic slow intro to an up-tempo verse and chorus, up until a quiet piano break, again into an up-tempo chorus, and back to a totally stripped acoustic slow break from the whole tempo of the song. The song features a prominent use of piano and acoustic guitar, and has a much heavier sound than the one present on the band's last album "Underclass Hero".
Like the band's last effort, "Underclass Hero", the song was totally produced, mixed and engineered by lead singer Deryck Whibley himself.
British Rail Class 432
The British Rail 4-REP electric multiple units were built by BR at York Works from 1966-1967 and 1974. The units were built to power the 4-TC trailer units on services on the South Western Main Line. Fifteen four-car units were built. The motor coaches were new build, but the trailers were converted from Mk1 hauled stock. They were initially classified as Class 441 and numbered 3001-3015. This was later changed to Class 430, under which they spent the majority of their working lives. Shortly before withdrawal they were reclassified Class 432 and the units were renumbered to 2001-2015.
British Rail Class 438
The British Rail 4-TC multiple units were unpowered fixed formation 4 carriage set (fitted with driving cabs at each end) converted by BR at York Works from locomotive-hauled Mark 1 carriages in 1966-1967 and 1974. The units built on experience gained from the prototype 6TC unit. They were initially classified as Class 442 and numbered in the 300 and 400 series. This was later changed to Class 491, under which they spent the majority of their working lives. Shortly before withdrawal they were reclassified Class 438 and the units were renumbered to 8001-8034.
British Rail Class 442
The British Rail Class 442 "Wessex Electric" (or 5WES) electrical multiple units, were introduced in 1988 on the South Western Main Line from London Waterloo to Southampton Central, Bournemouth, Poole and Weymouth. Twenty-four of these 5-car units were built between 1988-89 by BREL at their Derby works. Their introduction coincided with the completion of electrification from Bournemouth to Weymouth. The entire fleet was operated by South West Trains up until February 2007, when the Class 442 services were replaced.
British Rail Class 444
The British Rail Class 444 (or 5Des) "Desiro" electrical multiple units were built by Siemens AG from 2003-04. Forty-five of these units were built for express services for South West Trains. The "Desiro" family also includes units of Classes 350, 360 and 450.
British Rail Classes 445 and 446
The PEP Stock were prototype electric multiple units used on British Rail's Southern Region during the early 1970s. They were forerunners of the BR "Second Generation" electric multiple unit fleet. Three units were built, one two-car unit (2001), and two four-car units (4001/4002). Under TOPS, they were allocated Classes 445 (4PEP) and 446 (2PEP).
Ukrainians
Ukrainians are a group of East Slavic people from Ukraine. Ukrainians speak the Ukrainian language. Also widespread is the Russian language (mostly in the south and east).