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RADSL

Reading: Earl a D s l, [razuru]
Full spelling: Rate adaptive Asymmetric Digital Subscriber Line
Field:
Communication service > broadband > xDSL > RADSL

The ADSL technology which can change transmission speed dynamically according to the circumstance of the circuit. In the speed setting system which is used with RADSL, such as the method of choosing from midst of method and several stipulated speeds which are set to the maximum path velocity which responds to the circumstance of the circuit and deciding lowest speed, possible limit high speed the method of setting to speed, several there are methods at speed above that.

RAID

Reading: [reido]
Full spelling: Redundant Arrays of Inexpensive Disks
Field:
Storage > hard disk > RAID

It was lectured by 3 people David A.Patterson, Garth Gibson and Randy Katz of 1987 University of California [bakuri] school.

Dispersing the data, in order to record, acceleration and improvement of safety are measured. There is a method of using the private hardware and a method of actualizing with the software. Depending upon the level of high-speed characteristic and safety, there is six level from RAID-0 to RAID-5

RAID 0

Reading: [reidozero]
Full spelling: Redundant Arrays of Inexpensive Disks 0
Field:
Storage > hard disk > RAID 0

One of the level of RAID. Also [sutoraipingu] is called. The data is distributed to the plural disks equally, it is simultaneous in parallel and by the fact that it records, those which accelerate the reading and writing of the data. When the disk breaks even at 1, the whole data is impaired, with it records to 1 disks, as for reliability in order on the other hand to decrease, as for [sutoraipingu] is also a standpoint where we assume that it is not RAID, in comparison.

RAID 1

Reading: [reidowan]
Full spelling: Redundant Arrays of Inexpensive Disks 1
Field:
Storage > hard disk > RAID 1

Also mirroring is called. The system which completely writes the same data to 2 disks simultaneously. One side breaking, because already it can read out the data from one side, as for the system there is no problem and it is possible to continue to work. Because it means to write the same data to both, the capacity which can really be used becomes half of original disk capacity.

RAID 2

Reading: [reidotsu]
Full spelling: Redundant Arrays of Inexpensive Disks 2
Field:
Storage > hard disk > RAID 2

One of the level of RAID. The system where it forms the error correcting code which is called the hamming cord/code, with the data disperses and records. From the fact that processing at the time of recovery is complicated, it is not utilized.