HARD DISK DRIVES •Performance •Storage capacity •Software support •Reliability Why we call it as……. • Hard disk • Fixed disk • Winchester disk Hard Disk Drive Components • • • • • • • • Disk platter Read/Write head Head arm/Head slider Head actuator mechanism Spindle motor Logic board Air filter Cables & Connectors • Disk platter • The data’s are stored in this media • Form factor 9 5.5” - actual size is 5.12” 9 3.5” - actual size is 3.74” 9 9 9 9 2.5” 1 1/8” 1 1/3” 1” • The 5.25” platter
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Hard Drives Hard drives have been around longer than you think. In 1956‚ I. B. M. had invented a disk storage unit that was very large but did not store a lot of data. It was twenty-four inches in diameter and could hold only five megabytes‚ which is the equivalent to three and one half floppy disks. Originally called “fixed disks” later became known as “hard disks” opposed to floppy disks. In 1973‚ I. B. M. released a hard drive that could hold seventeen and one half megabytes. In 1980 Seagate
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The hard disk is the main storage device in your computer. It is a bit like a filing cabinet: all of your data files and applications software are stored on it. The hard disk contains a number of metal platters which have been coated with a special magnetic material. The data is stored in this magnetic material. Thus‚ the hard disk is known as a magnetic storage device. In order to access the data‚ the platters spin many thousands of times a second and a magnetic read and write head floats just
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determine how an excess amount of liquid‚ which was water‚ Gatorade and wine in this case‚ along with an excess amount of solute‚ which was the 7g NaCl pill‚ would affect the kidneys and the osmolarity of urine. Measurements of urine volume‚ specific gravity and chloride concentrations were recorded in order to investigate this. Our hypothesis stated that the volume of urine would increase for all groups other than the group drinking 80 ml of water along with taking a 7g. This portion of the hypothesis
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My Science Project Can water float on water? My Prediction I predict that water can’t float on top of water. Simply because it sounds impossible‚ but it will be interesting to find out if however it is possible. The Experiment First‚ I found two 1litre bottles and marked one with ‘+ salt’ and the other with ‘fresh’. I then went on to add red food colouring to the fresh bottle and yellow to the + salt bottle. The reason for doing so was to establish which ones were which and see if they
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What is Alkaline Water? Alkaline water‚ also commonly known as ionized water‚ is water that has a pH level greater than seven. This water is generally produced with the aid of a faucet-based water ionizer‚ or "alkalizer" and features a number of health benefits. Making Alkaline Water These are some of the possible sources of alkaline water: * Lemon (& Lime) Water * pH Drops * Alkalising Powder * Mainstream Water Filters * Water Distillers * Reverse Osmosis * Alkaline
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Why some water samples can be harder than others (1)Hard water is any water containing an appreciable quantity of dissolved minerals. (2) Some of the minerals come from chalk‚ limestone or marble‚ which the water may have flowed over or through. (4) Hard water contains calcium or magnesium ions. Limestone‚ marble or chalks are insoluble in pure water however they will dissolve slowly in acidic rain. If your water has emerged through limestone or chalk (calcium carbonate) it will be hard. (1) Soft
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Group find with the Hard Rock’s three main internal information systems (restaurant operations‚ merchandising‚ and financial)? Why was this a problem? [table – indented white bullets answer why] Restaurant Operations | Merchandising | Financial | * Different owners/franchisers implemented own restaurant management systems * No standards = hard for corporate to analyze sales * Processes broken & communication worse * Different experiences at different Hard Rock Cafés‚ any bad
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Management Information Systems Hardrock Café Case: 1. What problems did the Rank Group find with the Hard Rock’s three main internal information systems (restaurant operations‚ merchandising‚ and financial)? Why was this a problem? Problems the Rank Group found with the Hard Rock’s three main internal information systems -Restaurant operations -Merchandising -Financial The Hard Rock Cafe had many problems with their operating‚ merchandising and financial systems. First‚ there was no
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OF TITLE: REMOVAL OF HARDNESS OF WATER USING PRECIPITATION AND COMPLEXATION METHODS. NAME: KWARTENG YAW PRINCE COURSE: BSC. ENVIRONMENTAL SCIENCE YEAR: FIRST YEAR EXPERIMENT NO. : A.1.1.3. T.A.: BRIGHT KOFI LEONARD DATE: 7TH NOVEMBER‚ 2007. Aims and Objectives: 1. To describe water hardness. 2. To soften hard water in terms of the species involved and
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