The standard HDD controllers that are built onto most motherboards suffice for most server and data-processing needs. Small business systems configured with IDE or EIDE cards work well with onboard controllers (that is, on the motherboard) or your vanilla controller that sells for less than $50.
SCSI drives need SCSI controllers. These can range from your standard SCSI controllers to faster cards and cards that support mirroring, disk duplexing, disk arrays, and so on. One of the best-known names is Adaptec. Most branded computers that are configured for SCSI usually make their own SCSI controllers or use Adaptec.
A good SCSI controller is of paramount importance, because it makes no sense to install a fast SCSI drive or drive array and then go cheap on controller cards.
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Read how to maintain and repair any desktop and laptop computer. This Ebook has articles with photos and videos that show detailed step by step pc repair and maintenance procedures. There are many links to online videos that explain how you can build, maintain, speed up, clean, and repair your computer yourself. Put the money that you were going to pay the PC Tech in your own pocket.