TAILIEUCHUNG - The PC Doctor's Fix-it-Yourself Guide- P6

The PC Doctor's Fix-it-Yourself Guide- P6: A technical director for a UK-based computer company who teaches such courses as Caring for Your PC has developed prescriptions for treating sick PCs. Arguing the benefits of fixing it yourself rather than relying on experts, his mission is to empower users with trouble- shooting and safe repair skills. | CHAPTER 1 what s what the Anatomy of a PC 19 such as the hard disk floppy disk or CD-ROM. Data stored in RAM isn t permanent though and it is cleared as soon as the PC is shut down. When you turn your computer on again your operating system and other programs are again loaded into RAM usually from the hard disk. A RAM module is shown in Figure 1-4. NOTE RAM is called random access because any storage location can be accessed directly. It does not need to be written to or read sequentially. Generally the more RAM you have installed in a PC the better and faster it will run and the more applications you can have open at once. Reliability and stability also increase. You do however have to stay within the maximums as laid down by the operating system and the motherboard you have. There are many different types of RAM in use today. The two most common types are Single data rate SDR SDRAM is the older type of memory commonly used in computers before 2002. Double data rate DDR SDRAM hit the mainstream computer market around 2002 and can be found in most new computers. As the name suggests the biggest difference between DDR SDRAM and SDR SDRAM is that DDR can transfer data twice as fast as SDR SDRAM. Generally speaking motherboards are designed to support one type of memory. That means you cannot mix and match memory types on the same motherboard in any system. They will not function and will not even fit in the same sockets. The only correct type of memory for your computer is the one that it was built to take FIGURE 1-4 RAM module 20 The PC Doctor s Fix-It-Yourself Guide NOTE If in any doubt as to the type of memory your system takes consult the system manual or visit the website of a memory vendor listed in Appendix B . They normally have online tools to help you identify the correct memory for a particular system. Adding more RAM to a system is probably the single quickest and best upgrade that can be carried out on a system. RAM is cheap and adding more especially if

• Phần cứng
• sửa chữa máy tính
• sổ tay phần cứng
• MainBoard
• thiết bị máy tính
• thiết bị mạng
• lắp ráp máy tính
• Phần cứng máy tính
• lỗi máy tính
• hệ thống mạch máy tính
• điện máy tính
• Tài liệu máy tính