When talking about computer terms, you would definitely hear the word external hard drive very often. But for people who are not into the computer world, they would definitely ask what that thing is. An external hard drive is the same type of hard drive that is located inside the CPU of a computer or the laptop except that the hard drive is mounted in a separate casing and is found outside the CPU. It also functions the same as the computer does like storing information permanently or temporarily. The only difference is that it is connected to the computer via a USB or Fire wire cable and most operating systems will automatically recognize the hard drive allowing the users to use it freely to their hearts content.
But there are several types of external hard drive in India and when one is buying, they prefer to have the best external hard drive there is so the tendency is they look at the brand and the price of the hard drive without even looking at the features. Though most computers can recognize the hard drive but not every hard drive contains the same features as there will always be a difference in everything that is why the hard drives where divided into two types, the portable external hard drive and the desktop external hard drive. Regardless of the type, all the external hard drives are just having the same.
Two Types of External Hard Drive
Portable External Hard Drive
These hard drives are usually 2.5” hard drive in a slim line enclosure that is why they are easily carried thus the name portable. Though this hard drives are portable, it is also breakable and sensitive so extra care is needed when handling them. The portable external hard drive for mac is commonly USB Powered, which means you can just plug it to the USB port of the computer and you can use it. The only problem with this is that when all the ports in the computer or laptop are used then you have to remove one of the connected USB port so that you can plug the hard drive to your computer or laptop in order for you to use it.
Desktop External Hard Drive
Desktop external hard drives are normally 3.5” hard drives mounted into a larger casing than that of the portable hard drive. The device may also have fans integrated to assist in keeping it cool during use which extends the life of the disk drive. This external drives are designed mostly for the use of storing without being portable. It has a memory capacity that can reach up to 500 GB but now there are devices designed to have a 1 terabyte storage capacity. These are connected through the use of USB as well and it can be carried by other people also but the power supply should always be carried as well in order for it to be used in other computer devices.
Understanding External Hard Drives
If this drive isn’t spinning up, putting it in the freezer for about an hour will usually get the drive spinning again so you can copy needed files before the drive warms up again. A hard disk is a set of rigid magnetic disks aligned ona spindle, which is rotated by a motor. Remove the drive from the Laptop/Notebook and attach it to the IDE-cable of a Desktop computer. In our simple disk, the disk doesn’t have to do much. The first thing you want to do is run a disk utility like Norton disk doctor or wddiag (if it’s a western digital drive) to verify whether the drive is working mechanically or not.
A rotary structure moves a stack of heads relative to concentric tracks on the surface of the disks. You’ll need to find out how to remove the drive from your computer, normally with modern Notebooks/Laptops the drives are removable and it’s just a screw or two to get them out. In particular, it must just wait for the desired sector to rotate under the disk head. If it is a master boot record problem, sometimes running disk/mbr will correct the problem. The entire apparatus is contained in a tightly sealed case. Don’t forget – always power down your computer before you remove hardware. This wait happens often enough in modern drives, and is an important enough component of I/O service time, that it has a special name:rotational delay(sometimes rotation delay, though that sounds weird).
It could also be a virus, and a program like F-prot will look at the drive as a physical unit. A micro-controller takes care of steering the motors and translating the higher-level protocol that a computer uses to communicate with the disk to and from a bit stream, which is processed by specialized hardware (a DSP or FPGA) and fed to the heads. As soon as you’ve managed to remove the drive you’ll need a Notebook-to-IDE-adaptor which you can get at any computer store for under $15. Jumper your drive asa slave and connect it via this adaptor to any Windows computer.
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