There are usually 2 or more buttons as well. Many users find they cause less pain than a traditional mouse. A Touchpad is often found on a laptop instead of a mouse. This pad is found under the keyboard in most laptops i.e. closer to the body than the actual keys. Moving a finger across it moves the pointer. Multiple fingers can be used to send other commands e.g. two finger prolonged press opens up a page in a new tab. These devices carry data, in the same way that a hard drive does, but are much more portable. They are the primary method of storing data outside of a computer, and the main method of transferring information between computers without the use of a network, such as the Internet. CD-ROM: mostly read only memory unless labeled "rewritable" - Capable of storing 700MB of data, CDs have been the most common method of storing data for most of the last decade or so.
The system was designed to maintain the cases of integrated circuits at no more than 54 °C (129 °F), with refrigerant circulating at 21 °C (70 °F). Final heat rejection was through a water-cooled condenser. Piping, heat exchangers, and pumps for the cooling system were arranged in an upholstered bench seat around the outside of the base of the computer. About 20 percent of the machine's weight in operation was refrigerant. In the later Cray-2, with its more densely packed modules, Seymour Cray had trouble effectively cooling the machine using the metal conduction technique with mechanical refrigeration, so he switched to 'liquid immersion' cooling. This method involved filling the chassis of the Cray-2 with a liquid called Fluorinert. Fluorinert, as its name implies, is an inert liquid that does not interfere with the operation of electronic components. As the components came to operating temperature, the heat would dissipate into the Fluorinert, which was pumped out of the machine to a chilled water heat exchanger.
DEL to reboot, it overwrites the first line of your hard disk with a copy of the virus. The mutants of the computer virus world, these viruses shape-shift in order to avoid detection, while holding onto their basic threat capabilities. After infecting your files, these viruses replicate themselves in a slightly different way - which makes them very difficult to fully detect and remove. Satanbug virus: despite its let’s face it quite badass name, this polymorphic virus doesn’t intentionally damage your files - but with its up to nine levels of encryption, virus scanners have a hard time removing it from your PC. VirLock virus: part ransomware, part polymorphic virus, the Win32/VirLock virus encrypts your files and asks you for ransom - but it also changes shape every time it spreads. Some viruses are written in macro language, with the intention of embedding them within software that allows macro mini-programs such as Microsoft Word.
That means your PC can be infected by Word Document viruses. Melissa: distributed through email attachments, once this virus infects your PC it makes its way to your Microsoft Outlook mail client and mails itself to the first 50 contacts in your address book, potentially slowing down or even completely disabling servers in a chain reaction of suck. How do I protect myself against viruses? By now we have established you definitely don’t want any of these viruses anywhere near your files, your hard drive or your network. Now, let’s look at how you can avoid computer viruses in the first place. You have to, have to, have to have some form of antivirus software installed in your PC and your smartphone. An antivirus is your first line of defense against viruses and a whole bunch of other malware that you seriously don’t want to have to deal with. If you think viruses are bad (and they are), there’s stuff out there that’s even worse.
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