Using the Right Storage Device at the Right Time Essay Example for Free

Using the Right Storage Device at the Right Time Essay The advent of technology enabled us to have an easier and more comfortable life. Computers have been assisting us in almost all of our daily tasks, from typing to storing our files. Due to the ever developing computers and programs, files have evolved into different forms and sizes. This eventually led to the different forms of storage devices that are applicable to certain storage requirements. There are different classifications of storage devices depending on their access, memory retention and mode of data storage. The first classification is based mode of access by the central processing unit; and these are the primary and secondary storage. Primary storage, also called main storage or memory, is the part in a computer where data is kept for quick access by the CPU. In personal computers and laptops, it is most commonly called as the random access memory or RAM. Meanwhile, secondary storage, also known as auxiliary storage, is the data storage device not used as the primary storage. It is also known as external storage. Examples of this are hard disks, floppy disk, CD’s, DVS’s, magnetic tapes and flash drives (Search Storage, 2005). Another classification is based on memory retention. Volatile storage devices are those that do not retain data when the computer is shut down and an example of this is the common RAM. On the other hand, non-volatile storage devices are those that retain data even in the absence of a power supply and examples of these are hard disks and CD’s (MSD, 2006). The last type of classification is based on the mode of data storage and these are the magnetic and optical storage. Magnetic storage devices use magnetic disks that contain iron particles which can be polarized into a direction by a magnetic charge. The organization of the particles creates the data that is stored on that disk. Meanwhile, optical devices are high-capacity storage devices that uses reflected light in reading data. To store data, the metallic surface of the disc is covered with small dent (or pits) and flat (or land) spots. When the light is directed into a pit, the light is not reflected back thus there is a bit value of zero (or off) and when the light is directed to a land, the light is reflected, thus having a bit value of one (or on). The arrangement of these lands and pit determines the data stored (CM Lab). Due to the many forms of these storage devices, it is appropriate to know what situations are deemed fit of unfit for a specific type of storage device. In choosing a storage device for a certain job, it is important to take note of some items to ensure the use of the proper storage device. These include knowing how much data is needed to be stored, how fast data should be recovered, what storage devices are available, how automated the data storing process is and how fats the data could be stored (HP). These should be kept in mind in order to optimize your time and your back-up system. Random access memories or RAM’s are the primary memory of the computer. It is the memory used by the operating system of the computer when booting. After the boot, the other areas of the RAM unoccupied by the system become the conventional memory which the computer uses in running programs (MSD, 2006). The advantage of RAM is that if it is increased in a computer, it speeds up the processing of the computer enabling the user to use multiple applications. However, its disadvantage is that it is unusable once the computer is shot down. This means that RAM’s are applicable only in speeding up the processing of the computer and not in data storage. Hard disks are secondary storage devices that are used as the primary data storage of most computers. It is usually consisted of a number of inflexible platters that stores data electronically. The advantages of hard disks over other data storage devices include huge storage capacity and fast access time, cheaper on per megabyte basis and are more reliable since they are better protected and are made to be more durable. However, they still have disadvantages, such as non-portability (for installed drives), less security of data due to vulnerability to virus attacks and head crash due to contaminants and extreme shocks (Wong). This means that hard disks are efficient only on storing of huge data for relatively short periods of time. Floppy disks are flexible plastic disks that are coated with magnetic material use to store data magnetically. It is most commonly known as the diskette. They are very popular in the 1990’s, however, they not anymore considered standard today due to its more efficient alternatives (MSD, 2006). The advantages of diskettes include portability and cheapness, random access of data, write-protection feature and ease in transferring data from one computer to another. However, it also has its disadvantages, and these are its non-durability, slow access time and very limited storage capacity (Wong). This means that diskettes are appropriate only for small and temporary data storage. Compact disks are optical devices that stores data. They use microscopic pits and lands in storing data. Their advantages include portability, relatively large storage capacity, a relatively fast access time, and permanent data storage. Meanwhile, its disadvantages include its non-reusability and relatively slow writing time (Wong). This means that CD’s are more applicable in storing permanent data that requires no editing such as software installers and audio files for longer periods of time. Magnetic tapes are strips of plastic coated with magnetic material and are capable of storing huge amounts data. Their advantages include huge capacity, cheapness, reliability and universality; and its disadvantages include sequential accessing and frequent cleaning (MSD, 2006). This means that tapes are more appropriate for backing-up huge amounts of data for relatively long period of time. Flash drives are storage devices that used flash memories or chips to store electronic data. They are the new form of data storage devices. Its advantages include compactness, portability, fast data writing and access and consists no mobile parts. Its disadvantages include expensiveness and limited data storage (MSD, 2006). This means that flash drives are more appropriate in storing medium size data that needs to be transported or transferred to other computers.

Voluntary Testing for Pregnant Women Essay -- Pregnancy Birth Papers

Voluntary Testing for Pregnant Women During the past decade, the human immunodeficiency virus (HIV) has become a leading cause of mortality among women. This population is now accounting for the most rapid increase in cases of acquired immunodeficiency syndrome (AIDS) in recent years. As the numbers of cases of HIV infection have increased among women, particularly of childbearing age, increasing numbers of children have become infected as well. "Various studies conducted to date indicate that between 1/4 and 1/3 of infants born worldwide to women infected with HIV have become infected with the virus themselves" (HIV InSite, 1997). This is due to the route of transmission known as vertical transmission, from mother to infant. Thus, HIV infection has now also become a leading cause of mortality among young children, and virtually all of these infections can be attributed to vertical transmission. More than 4 million American women get pregnant each year, an estimated 8,000 of them HIV infected. (USA Today, 1999) HIV can be transmitted from an infected woman to her unborn fetus or newborn during pregnancy, during labor and delivery, and even during the postpartum period via breastfeeding. "Reports show vertical transmission rates ranging from 13% to 40%" (HIV InSite, 1995b). This translates into approximately 1,000-2,000 HIV-infected infants being born each year in the United States. Although transmission of HIV to a fetus can occur as early as the second month of development, research suggests that at least one half of vertically transmitted infections from non-breastfeeding women occur shortly after or during the birth process (HIV InSite, 1995a). Due to the seriousness of vertical transmission, there have been ... ...d the Physician-Patient Relationship." AIDS & Ethics. Ed. Reamer, Frederic G. New York: Columbia UP, 1991: 188-214. "PHS Guidelines for HIV Counseling and Voluntary Testing for Pregnant Women." Factsheet Public Health Service. CDC. July 1995. (Article, HIV InSite, HIVInSite.ucsf.edu/topics/women/). "Public Health Service Task Force Recommendations for the Use of Antiretroviral Drugs in Pregnant Women Infected with HIV-1 for Maternal Health and for Reducing Perinatal HIV-1 Transmission in the United States." MMWR Reports, Vol. 47, January 30, 1998: No. RR-2. (Article, HIV InSite, hivinsite.ucsf.edu/medical). "US Public Health Recommendations for Human Immunodeficiency Virus Counseling and Voluntary Testing for Pregnant Women." US Department of Health & Human Services—Public Health Service. July 7, 1995. (Article, HIV InSite, hivinsite.ucsf.edu/medical/).

Greenwich

Greenwich Mean Time (GMT) is a time system originally referring to mean solar time at the Royal Observatory in Greenwich, London, which later became adopted as a global time standard. It is arguably the same as Coordinated Universal Time (UTC) and when this is viewed as a time zone the name Greenwich Mean Time is especially used by bodies connected with the United Kingdom, such as the BBC World Service,[1] the Royal Navy, the Met Office and others particularly in Arab countries, such as the Middle East Broadcasting Center and OSN.It is the term in common use in the United Kingdom and countries of the Commonwealth, including Australia, South Africa, Nigeria, India and Malaysia, as well as many other countries in the Old World. Before the introduction of UTC on 1 January 1972 Greenwich Mean Time (also known as Zulu time) was the same as Universal Time (UT) which is a standard astronomical concept used in many technical fields. Astronomers no longer use the term â€Å"Greenwich Mean Ti me†.In the United Kingdom, GMT is the official time only during winter; during summer British Summer Time is used. GMT is the same as Western European Time. [2] Noon Greenwich Mean Time is rarely the exact moment when the sun crosses the Greenwich meridian (and reaches its highest point in the sky at Greenwich) because of Earth's uneven speed in its elliptic orbit and its axial tilt. This event may be up to 16 minutes away from noon GMT (a discrepancy calculated by the equation of time).The fictitious mean sun is the annual average of this nonuniform motion of the true Sun, necessitating the inclusion of mean in Greenwich Mean Time. Historically the term GMT has been used with two different conventions, sometimes numbering hours starting at midnight and sometimes starting at noon. The more specific terms UT and UTC do not share this ambiguity, always referring to midnight as zero hours. Astronomers preferred the latter GMT convention in order to simplify their observational da ta so that each entire night was logged under a single calendar date

Exploring the Role of Women in Mexico in Like Water For...

Like Water For Chocolate by Laura Esquivel explains women’s roles in northern Mexico during the turn of the nineteenth century. The novel takes place in northern Mexico on a family ranch where many family traditions are carried out. Also, the novel describes some of the typical foods that were prepared and fiestas that were celebrated in the Mexican culture around this time. However, the novel mainly focuses on the roles of females in Mexican society at that time. The novel goes beyond explaining women’s roles and also explains what took place in the Mexican family. Throughout the novel, readers learn the role of mothers, the conflict between personal desires and tradition, and typical foods, celebrations, and family traditions that were†¦show more content†¦I thought what a wonderful way to tell a story† (Mujica 38). The reader is often present in the kitchen with Esquivel when she writes about her past experiences in the kitchen. At the time Like Water for Chocolate takes place, the Mexican Revolution rages on. The book takes place during the turn of the nineteenth century, which leads to many other events in the story. The Mexican Revolution took place from 1910 to 1920, and brought many changes to the Mexican culture. In the novel, the reader can see that Gertrudis was one of the many women who participated in the Mexican Revolution, and worked her way up to being a general in the movement. Women that participated in the Mexican Revolution were sometimes found fighting beside the men, which was not something that many women did during that time. Also, during the time of the Mexican Revolution, the soldiers treated many women and young females poorly. Esquivel tells how many women were mistreated, â€Å"A group of bandits attacked the ranch. They raped Chencha. Mama Elena, trying to defend her honor, suffered a strong blow to her spine and was left a paraplegic, paralyzed from the waist down† (Esquive l 129). These events are described vividly from her first-person perspective to better understand the situations that took place during the time that the Revolution was raging on. Along with the duties at home,Show MoreRelatedAn Allegorical Reflection on the Mexican Revolution4344 Words   |  18 PagesIdentity in Like Water for Chocolate Leah A. Cheyne, barwench99@hotmail.com April 30, 2003 Alfonso Arau’s Like Water for Chocolate (1993) can be read as an allegorical examination of the Mexican Revolution, tracing the effects of the conflicting ideologies underlying the revolution through the displacement onto the family structure. At once removed and central to understanding the narrative, this portrayal of the Mexican Revolution valorizes and romanticizes the contributions of women. 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