Hard Disc Repairs

Hard Disc Repairs, Very Important

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Hard disc repairs by Crawley Computer Centre

A hard disk is part of a unit, often called a “disk drive,” “hard drive,” or “hard disk drive,” that store’s and provides relatively quick access to large amounts of data on an electromagnetically charged surface or set of surfaces. So this baby is like the brain of the computer is stores all information into the system if that gets destroyed I am so sorry for you matter a fact am more than sorry for you.

The hard disk has one or more metal platters coated top and bottom with a magnetic material similar to the coating on a VCR magnetic tape. In the VCR the tape moves by a fixed recording and sensing device (the “head”).  In a disk, the recording head is on a movable metal support called the “arm”. Information is recorded onto bands of the disk surface that form concentric circles. The circle closest to the outside is much bigger than the circle closest to the center. Since each metal platter has a top and bottom surface, there are at least two magnetic circles for each size and location. However, a disk may have as many as five platters, producing ten of these identical circles at the same distance out from the center. There is a separate magnetic read/write head for each disk surface. With five platters there are ten heads. They are all fixed on metal “arms” that can move the head from the innermost to the outermost circular position on the disk surfaces. The arms all move together, so if there are 10 disk surfaces the read/write heads are in the same location on all 10 surfaces simultaneously. One circle on a disk surface, equivalent to one position of the read/write head on the end of the arm is called a track. All of the tracks on all of the surfaces that correspond to the same arm position used to be called a cylinder. However, since the outer circles are bigger they can hold more data, and modern disks hide the actual location of the arm so that no operating system can determine exactly where it is. So today the term “cylinder” is typically used to refer to a certain number of megabytes of disk space that can be assigned to a partition (a disk letter in Windows). To find some particular piece of data, the disk must move the arms to the position where it is located. This is called seek.

 

Hard Disc Repairs

 

Power-On Self Test (POST). The POST runs very quickly, and you will normally not even noticed that it is happening unless it finds a problem. The POST also uses extended troubleshooting codes that you can use to get much more detail on what problem a troublesome PC is having.

MEM.EXE: This simple utility, built into recent versions of DOS and also Windows 95, provides you with details about your memory configuration, as well as what is currently using your memory. It is especially useful when run with the “/C” parameter (use the “/P” parameter as well to make the output pause when it is scrolling).

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Microsoft Diagnostics or MSD.EXE, this is a small DOS utility that takes a brief inventory of the contents of your PC and shows them to you in a text-based format. This is very useful for seeing what disks are in the system, how much memory is installed, and also for checking system resource usage such as LPT ports and IRQs. MSD.EXE is included in later versions of DOS. Not normally part of Windows 95, you can find it on the Windows 95 CD however and then copy it to the C:WINDOWSCOMMAND directory to make it work.

Windows 95 Device Manager: This is the most useful tool for identifying system configuration and resource usage information under Windows 95. To access it, open the Control Panel and select the “System” icon. Then select the “Device Manager” tab. You will see a graphical “tree” structure showing you all of your PC hardware. If you select “Properties” while “Computer” (the top-level item) is selected, you will be able to see all the IRQs, DMA channels and I/O addresses in use in your PC; very useful for resolving resource conflicts. The same “Properties” button, pressed after selecting a specific hardware device, will show you driver information, resource settings for the hardware item chosen, and much more.

Norton System Information: This utility is similar to the Microsoft Diagnostics, only more detailed in its later versions. It goes well beyond what MSD gives you and is part of Symantec’s Norton Utilities.

Microsoft ScanDisk and Norton Disk Doctor: These programs are used to check for hard disk problems. This includes file system corruption and hard disk read errors and should be used when hard disk problems are suspected.

Norton Diagnostics: This utility goes beyond the system information program and actually perform tests on the hardware to identify problems. It includes tests of the processor and motherboard and system memory, and will identify some types of resource conflicts.

 

The hard disk is a very important part of the computer and very delicate, you should try to make sure nothing happens to this part of the computer or you are doomed. If something happens to your hard drive I would advise you get it checked out a professional technician, which is where we come in the fastest hard disc repairs Crawley.