What is RAID; it is an acronym for Redundant Array of Inexpensive (or Independent) Discs.
A RAID is a series of drives that when added together act as a single storage system. In most configurations this storage system can tolerate the loss of a disc drive without losing data and depending on how it is configured can rebuild itself once the failed drive is replaced.
These are the most common RAIDS we will come across; there are also Raid Level 3, 10 and 50.
A Raid level defines the way the data is spread across the drives.
Raid Level O (striping)
This raid level provides no redundancy across the drives. Performance is improved but failure of any disc results in complete data loss.
Raid Level O Usage: Any application which requires high speed storage, but does not require redundancy, such as Photoshop temporary files.
Raid Level 1 (Mirroring)
This Raid duplicates all data from one drive to a second drive so if either drive fails no data is lost.
Raid Level 1 Usage: Applications which require redundancy with fast random writes or systems where only two drives are available.
Raid Level 5 (Distributed Parity)
Raid level 5 distributes data across several drives and distributes parity among all drives. If one drive fails all data can be rebuilt, if more than one drive fails all data will be lost.
Raid Level 5 Usage: Provides higher performance if most input/output is random and in small chunks, a database server is a good example.
This is about as short as I could make this and have it make any sense, further information can be found on the web.
2
Standard Definition (SD) video played on HDTV
0 Comments | Posted by hmetechnicalcorner in Video
Consumers are switching from 4:3 standard TV sets to 16:9 HDTVs for the larger screen and higher resolution. Due to the switch from standard definition to high definition consumers can be confused about the differences in aspect ratios and the HDTV video settings that have a direct affect on how the video is displayed. Aspect ratio is the ratio of the width of the TV picture to the height of the picture. Standard definition is 4:3 and high definition is 16:9. When a full screen standard definition video is played back on an HDTV the edges will be black or “cropped”, assuming that your HDTV video playback settings are set to normal so that your HDTV will display video at its original aspect ratio. When a letterboxed 4:3 video (black bars at the top and bottom) is played back on an HDTV with the video playback settings set to normal the video will appear to be squeezed. Change the video playback settings on your HDTV to 16:9 widescreen so that the video will playback full screen the way it was intended to be viewed.
