If you plug an SCSI card into your pc, don’t hold your breath because nothing exciting is going to happen. (Unless of course you have made a very bad job of installing the card. Then you might see smoke and flames coming from your cherished/reviled PC or even, in extreme cases, find yourself moving down a tunnel towards a bright light.) However, once you have installed you SCSI card you will be able to attach any number of exciting devices to your pc.

A SCSI card is possibly one of the least sexy devices you can plug into your PC. However, it is one of your more useful options as installing it opens up a huge range of possibilities. SCSI stands for "Small Computer System Interface" and is pronounced "scuzzy" and is a system for connecting things to your pc, things like hard drives, scanners and cd writers, devices that need to be able to shift hefty amounts of data about quickly. A while back SCSI walked all over IDE in terms of performance but cost a packet. Not only were SCSI devices vastly more expensive but you also needed to buy a special and expensive SCSI controller card. The price and performance difference gap between SCSI has now fallen significantly (IDE is better SCSI is cheaper). You can now pick up a brand new SCSI card for £30 to £40 and SCSI devices are cheaper too. SCSI does still have the edge though and it is sometimes worth paying just a little bit more. The high rate of data transfer makes SCSI is attractive to those who moving large amounts of data, consequently a lot of servers and high-end workstations use SCSI. The sort of people who work with these systems don’t really need telling about SCSI, grandmother and eggs springs to mind. A good example of why an ordinary mortal might use SCSI would be anyone interested in working with digital video or large sound files or who wants to write cds quickly or scan large images quickly.

So in summary SCSI moves data faster, you can connect a lot of devices, it is more reliable but it does cost a bit more.

The bad news is that while SCSI is cable of up to 160 mb per second this card will only do 10 mb per second. If that does not mean much, to you then try to think of it in terms of floppy disk per second, the AVA 2704 can move the equivalent of just over seven full floppy disks of data in a second where as its big brothers can move the equivalent of just over 114 floppy disks worth in a second! However, this was not really an issue for me as I only trying en to attach one old SCSI cd writer. Still it would have been nice to have the option! My only other gripe would be the lack of software bundled with it. Adaptec are supposed to have some excellent software for working with SCSI, in this case it was notable by its absence. Although since a lot of the things you can fiddle with in SCSI are pre set on this card I am not sure how useful it would be anyway.

USB2 was mentioned in a comment on my article on the Plextor SCSI cd-writer (thanks bigdgaff). This is a fair point. USB2 is going to be of comparable speed to SCSI (60 mb/s as opposed to 160 MB/sec?), will allow many more devices at once to be attached to your pc and will probrably be integrated onto your motherboard and hence be effectively free. The main disasdavantage is that is is not here yet whereas SCSI is. USB 2 is only the second incarnation of USB whereas SCSI has already been through many, the latest being Ultra160 SCSI, and consequently many more devices are available. I think USB2 will not so much replace SCSI as compliment it at the lower end of the market.