Are Ultra3 SCSI Cards backwards compatible?

I am looking to buy a server with a 9gb hard drive so I need to to upgrade. Here is what the spec sheet says.

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SCSI hard-disk drives two 1-inch high slots in hard-disk drive bay support formatted capacities from 9 GB to 18 GB and higher

SCSI devices an Adaptec 29160LP Ultra3 SCSI card
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I was looking around at SCSI hard drives and I am totally confused. There are 6 or 7 different types of SCSI drives. It seems that the Ultra3 standard is the latest and greatest but they cost almost half of what the whole server is going to cast me.

So my question is, what type of SCSI drive will work with the above card. The drive bays are hot swappable, 80pin 1inch high. Will drives like the Ultra, 160 or Ultra2 work too? or does it have to be an Ultra3 drive no matter what?

 

 

 

 

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