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Great, we ve created a text field, a button, and a text node The next step is to install all those items into the <div> element we ve created, newDiv, and we ll use the dynamic HTML insertBefore method You use this method to insert new elements into a web page, passing it the new element object to insert and the current element object you want to insert the new object before In this case, we ll insert the new objects into the <div> element we created and since there s no existing object in the <div> element to place our new objects before, we ll pass a value of null for that argument Here s how we insert the new button, text field, and text node into the <div> element we created:

Drive Action When the computer is switched off, the hard-drive mechanism locks the heads in a position away from the platters This prevents damage to the heads and platters if the computer is moved When the computer is powered up, the platters spin at several thousand revolutions per minute (rpm) The heads hover a few millionths of a centimeter above and below the platter surfaces When you type a command or click on an icon telling the computer to read or write data, the hard-drive mechanism goes through a series of rapid, complex, and precise movements The head positions itself over the particular spot on the platter where the data is located or is to be written; then the head detects the magnetic fields and translates them into tiny electric currents All this takes place in a small fraction of a second Data Arrangement and Capacity The data on a hard drive is arranged in concentric, circular tracks There are hundreds or even thousands of tracks per radial centimeter of the platter surface Each circular track is broken into a number of arcs called sectors A cylinder is the set of equal-radius tracks on all the platters in the drive Tracks and sectors are set up on the hard drive during the initial formatting process There are also data units called clusters These are units consisting of one to several sectors, depending on the arrangement of data on the platters Figure 33-2B is a face-on view of a single hard-disk platter, showing a track and one of its constituent sectors

<script language="JavaScript"> function createNewElements() { var newDiv, newTextfield, newText, newButton; newDiv = documentcreateElement("div"); newDivid = "NewDIV"; newTextfield = documentcreateElement("input"); newTextfieldtype = "text"; newTextfieldvalue = "Hello!";

When you buy a computer, whether it is a desktop, notebook (also called laptop), or portable (also called handheld) unit, it will have a hard drive built in The drive comes installed and formatted Most new computers are sold with several commonly used programs installed on the hard drive Some computer users prefer to buy new computers with only the operating system, by means of which the programs run, installed; this frees up hard-drive space and gives the user control over which programs to install (or not to install)

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level have less and less involvement in the scientific or technical area that they have chosen and enjoy Or do they remain scientists and technicians and leave the management to someone else Higher salaries, the desire to have an impact on the larger organizational issues, and a sense of advancement often attract people to management positions At some point in an individual s career, a choice must be made Ideally, a programmer or analyst will have this choice Some highly skilled programmers and analysts find themselves at a dead end because they are too hard to replace if moved into management If management is their ambition, then they are forced to issue an ultimatum or to change companies Once promoted or committed to management, managers at any level should broaden their knowledge of networks, computer security, databases, telecommunications, and other areas to ensure their value to the company at higher levels Because of the pressure to learn more about business, programmers and analysts sometimes enter executive masters of business administration (EMBA) programs These programs are designed for midcareer professionals who want a better business background but do not want to interrupt their careers to get it Admission to such programs usually requires about ten years of work experience and some managerial responsibility These programs stress on-the-job applications with a business orientation More educational opportunities for managers are being offered over the Internet The work and pressures are great, but then this, too, is excellent preparation for promotion to top-level management