compressed some graphics and audio formats have been reduced b permanently

Compressed some graphics and audio formats have been

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compressed, some graphics and audio formats have been reduced b permanently discarding data o Decompress the ±le to restore it to its original state System maintenance utilities o Disk cleanup: windows utility that cleans, removes unnecessary ±les from your hard drive (accumulated ±les in bin, temporary ±les, temporary internet ±le – you check o0 which type of ±les you would like to delete o Disk defragmenter regroups related pieces of ±les on the hard drive, allowing the OS to work more eFciently – Macs don’t have this option, but you can use iDefrag which is an external program o Error-checking: windows utility that checks for lost ±les and fragments as well as physical errors on your hard drive (±les are lost when you save, resave, move, delete, and copy ±les) – can recover data but usually deletes the ±les that are unnecessarily taking up space o Sometimes system gets confused leaving references on the ±le allocation table to ±les that no longer exist or have been moved o Physical errors: mechanism that reads the hard drives data can no longer determine whether the area holds a 1 or 0 (called bad sectors) o Use task manager utility if a program has stopped working to check the program or to exit it System restore and backup utilities o System restore: utility that lets you roll your system settings back to a speci±c date when everything was working properly (latest versions of windows) o System restore point: snapshot of your entire system’s setting (made every week), you can also create it manually o Every time you start your comp. or install a new application or driver, windows creates a system restore point – good idea to create before making changes to your computer o Windows backup and restore utility: create a duplicate copy of all the data on your hard drive and copy it to another
storage device – Mac OS X Snow leopard (time machine automatically backs up your ±les, time capsules) The task scheduler utility o Important to run some of these utilities on a routine basis – many ppl forget o Windows task scheduler utility: schedules task to run automatically at pre-determined times with no additional action necessary on your part Accessibility utilities: windows includes an Ease of Access center (centralized location for assistive technology and tools to adjust accessibility settings) o High contrast o Magni±er o Narrator o On-screen keyboard o Windows speech recognition Chapter 6 - understanding and assessing hardware: evaluating your system Moore’s law: the pace at which CPUs (central processing units – brain of the computer) improve. Predicts that the number of transistors inside a CPU will increase so fast that CPU capacity will double every 18 months (# of transistors helps determine how fast it can process data) Other system components also improve – ex: the capacity of the dynamic random access memory increases abt 60%/ year, hard drives by 50%/year CHOOSING EITHER A DESKTOP OR NOTEBOOK

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