for? RAID (Redundant Array of Independent Disks) is a storage technology that combines multiple disk drive components into a logical unit. Data is distributed across the drives in one of several ways called "RAID levels"‚ depending on what level of redundancy and performance (via parallel communication) is required. Marketers representing industry RAID manufacturers later attempted to reinvent the term to describe a redundant array of independent disks as a means of dissociating a low-cost expectation
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independent disks. Below are some RAID configurations with a brief description. RAID 0 Is the fastest of all the RAID levels‚ it uses a technique called data striping (see below) and requires at least two hard disks. RAID 1 This level uses a pair of hard disks at a time to provide fault tolerance (there is no performance benefit) and requires at least 2 hard disks. Using a technique called disk-mirroring (see below) the same data is written to both disks at a time‚ so if one hard disk crashes
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Chap3 Exercises 1. Why is RAID 1 not a substitute for a backup? 2. Why is RAID 0 not an option for data protection and high availability? RAID 0 is data striping. This means that data will appear to a user as one logical disk but all the data is distributed among two physical disks. If one disk fails operation cannot continue and data is lost because it is only stored in one place. RAID 1 uses two disks that are mirrored copies of each other. If one disk fails‚ operation can continue
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Disk scheduling is one of the main responsibilities of Operating System. OS manages hard disk to provide best access time. All major Disk scheduling algorithms incorporate seek time as the only factor for disk scheduling. The second factor rotational delay is ignored by the existing algorithms. This research paper considers both factors‚ Seek Time and Rotational Delay to schedule the disk. Files are the most obvious objects in the operating systems manipulate. Everything is typically stored in files:
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Nicholas Young (14950761) Mr. Huynn NT1230 10 January 2013 Unit 2. Assignment 1. Disk Redundancy 1. Redundant Arrays of Inexpensive Disks (What is RAID?) 2. The basic idea of RAID was to combine multiple small‚ inexpensive disk drives into an array of disk drives which yields performance exceeding that of a Single Large Expensive Drive (What is RAID?). 3. a. RAID Level 0 is not redundant‚ hence does not truly fit the "RAID" acronym. In level 0‚ data is split across drives
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the Device The selected oscilloscope for this project is the GW-Instek (Model GDS-3152) Digital Storage Oscilloscope with a sampling rate of 150 MHz‚ as shown in Figure 38. Figure 38. GW-Instek oscilloscope The oscilloscope has a function to save the screenshots of the plots‚ as well as the 48 sampling data in the form of Excel file‚ which can be used for further analysis. The oscilloscope can also be linked directly to the computer for ease of data retrieval. This is a digital storage oscilloscope
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process it into useful information (output) and stored it away (in a secondary storage device) for safekeeping or later reuse. The processing input to output is directly by the software but performed by the hardware. To function‚ a computer system requires four main aspect of data handling: Input Processing Output Storage Secondary Storage Input Processing
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Disk Drive Technology (Hard Disk Drive Technology) Group 3: Instructor: Tyrone James Dumandan Mr. Allen Paul Aclan Chrysolite Nocon Renz Niño Mercado Marwin Opon Section BSCpE 102 – B Disk Drive or Hard Disk Drive A disk drive is a randomly addressable and rewritable storage device. The term can be broadly interpreted to include optical drives
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Storage Space Outline -Bits and Bytes -storage devices Hard drives (internal‚ external‚ network) Flash drives Cloud Storage -Technologies currently in development -Summary The purpose of this paper is to shed some light on computer storage devices. In order to understand how computer storage devices work‚ I will have to discuss bits and bytes. According to About.com’s contributing author
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Blu-ray Disc Blu-ray Disc (BD) is an optical disc storage medium designed to supersede the DVD format. The plastic disc is 120 mm in diameter and 1.2 mm thick‚ the same size as DVDs and CDs. Blu-ray Discs contain 25 GB per layer‚ with dual layer discs (50 GB) being the norm for feature-length video discs. Triple layer discs (100 GB) and quadruple layers (128 GB) are available for BD-XL re-writer drives.[2] The major application of Blu-ray Discs is as a medium for video material such as feature
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