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buying a computer for dummies 2005 edition phần 4

bạn có thể cần một cái gì đó tương tự như ở nhà. Nếu bạn mua một máy tính cho trẻ em trong trường học, yêu cầu giáo viên của họ những gì các loại máy tính tốt nhất chạy các phần mềm trường học sử dụng. Mua một cái gì đó tương tự như cho gia đình. | 78 Part II Hardware and Software Overview The only figure you really need to pay attention to is for hard drive storage. Hard drives don t come in standard sizes. Instead you find hard drives that store anywhere from 20GB of information up to a whopping 100GB and higher. You pay more for more storage or less for less. You want to ensure that you get more storage than you need so that you don t run out. Remember that a megabyte is 1 million bytes and a gigabyte GB is 1 billion bytes or 1 000MB . How much storage capacity do you need That depends on your software and how you use the computer. This book shows you how to calculate the exact amount and then add a bit more so that you don t run out of disk storage. If you re not satisfied with the preceding information tidbit consider that I would have at least a 40GB hard drive in a new computer. Disk storage is relatively cheap. Buy more than you need if you can afford it. Even if you do run out of disk storage most computers have room to add a second hard drive internally which gives you even more storage. Hard drive speed The faster the disk drive the faster you can read information from that disk drive. Faster is definitely better. And naturally the faster it is the more expensive the disk is. Speed doth have its price. Disk drive speed is measured in RPM or rotations per minute like old stereo records. Remember the 45 rpm and the 33 rpm How about the old 78 rpm Well with disk drives rpm is measured in the thousands. If you can afford it try to get a hard drive that spins at 7200 rpm. That type of drive performs better than one running at 5400 rpm. Other technical values are associated with disk drives. Try not to get mired in the access time or transfer rate or anything else. Those values are trivial with respect to day-to-day operations the differences among them are laughable unless you re an engineer of course and you laugh only at ionization jokes . CD-ROM drive speed Unlike with hard drives the speed of a .