March 26, 2008

What is RAID(Just the Basic)

Often times we encounter the term RAID, but some dont really know or have little knowledge about RAID, so I try discuss some of the basics about RAID.

This post will give an overview about the RAID system and introduce the basic background and glossary which you need to know before using RAID.

1. RAID-means Redundant Array of Independent Disk Drives, it use several hard drives to increase data transfer rates and data security. It depends on the number of drives present and RAID function you select to fulfill the security or performance purposes or both.

2. RAID 0- Also known as "Stripping". All of the data are distributed evenly to all of the existing drives. You gain benefits on performance because the data transfer rate is multiplied by the number of drives.However, RAID 0 has high risks of data security. All of the stored data will be lost if even any one drive in the RAID set crashes.

3. RAID 1- Also known as "Mirroring".Two hard drives are required. The goal of RAID 0is to ensure data security. Data is written to two or more drives synchronously. That is, 100% duplication of data from one drive to another.

4. JBOD(Just a bunch of drives)-Also known as "Spanning".Two or more hard drives are required.Several hard disk types configured as a single hard disk.The hard drives are simply hooked up in series.This expands the capacity of your drive and results in a useable total capacity.However, JBOD will not increase any performance or data security.

March 10, 2008

Just a short note on another PS problem

I encounter a problem just recently that point to a problematic PS supply.The situation is that the unit turns on normally,but while inside Windows it resets intermittently. At first, I suspect of a problematic memory chip or a problematic OS but as I further isolate the problem, it point to a defective PS supply unit.

If ever you encounter similar problem such as this one, try replacing the PS unit first before thinking of reformatting your hard drive.

My Review on Memory Deal

There are thousands of a computer memory dealer all around the globe, be it for a MAC,PC or a SUN system.In spite of this, there are only a few of them that are selling superior quality memory and Memory Deal is one of them.

Memory Deal sells memory coming from reputable memory chips maker such as Samsung, Hynix, Qimonda, Micron, Elpida and Nanya, the very same brand that are installed in branded PC, MAC and SUN systems.

The company sells a wide range of quality memory products design for servers,desktops and notebooks equipment,making a particular system to perform efficiently on its day to day operation.

Whether its RAMBUS,SDRAM,DDR I or DDR II, all their products are quality tested to ensure costumer satisfaction, enabling the company consistently successful in any computer memory deal they enters.Although, memory from Memory Deal cost a little expensive compare with other memory supplier,but the quality of its products and customer support will balance the price difference its competitors offers.

Memory chips plays an important role in one's system and in my experience there are more problems encountered on low quality (generic) memory compared with branded one's, and if you can shell out a few bucks on a class A memory chips, you better do so for it will contribute years of trouble free computing.

If your planning to get a deal on memory with superior quality,considers Memory Deal

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March 6, 2008

My way of dealing computer viruses!

As computer hardware advances so was the viruses that infect our PC and sometimes its very difficult to remove such viruses, in spite of the advancement of different anti-virus programs,and still end-user and even technicians end-up in reformatting one's hard drive just to get rid of particular virus(es).

It will be hard to disinfect a computer virus when it loads up at start up(and even if you start in safe mode). Trojan are the most common type of virus that infects everyone's PC worldwide(Window base OS), it(the virus) sometimes disable the functionality of some key Windows utilities(regedit,msconfig,task manager, folder options...etc) to avoid from being deleted or disabled from loading.

As PC repair technician I have deal almost all kinds of computer virus on a PC that is Window base, and often times it is a lot tedious spending time cleaning a PC infected with viruses than just reformat the whole thing and re-load the drivers and needed software.

But, their are situations that a PC has a special programs installed that the owner don't have the installer and need to be preserved, In situation such this one you have no choice but to try everything to clean the virus and have his current installation be preserved by all means.

The best way to clean an infected HDD is to pull-out the hard drive from its CPU and have it scanned by a known clean and well protected PC, normally I suggest installing at least two effective anti virus programs to have a good chance of eradicating the infection(s)of a particular hard drive, and make sure that the virus database of all your anti virus or spyware programs are up to date before inserting a hard drive that is infected with virus.

After being certain that the infection has been removed, install back the hard disk to its CPU and check if its working fine, check also if restrictions on some of the utilities mentioned above has been restored, if some of it are missing or still disabled I suggest that you download a restrictions removal tool(RRT) to solve the problem(search the net).Also don't forget to update virus pattern(s) of your anti virus and make a full scan to check if there was no more infections left.

If in any case after 2 or 3 days the same virus re-appear and mess up your PC's configuration all over again, you have no choice but to re-format the hard drive and loads a fresh copy of your OS and application softwares.

Viruses can be avoided if the user itself is cautions in dealing files coming from the net, FDD, Flash Drives, CD...etc. Plus make sure that its anti-virus pattern(virus datatbase) is always up to date and perform a regular scan at least once every week.In my experience, a lot of end-users dont care if there anti virus database is up-to-date, what most users believed that as long that they have an anti-virus program installed on their PC they are already safe.

A well informed PC user will have lower risk of a virus infection in their PC, compare to PC users that don't have proper know how in dealing computer viruses.