Dell PowerEdge 1600SC Replacement Hard Drive

We use a Dell PowerEdge 1600SC running Win Server 2003 as a domain controller for a small network.  We have three Seagate Cheetah ST318453LW hard drives in a RAID 5 config (not hot-swapable).  Last night, one of the drives failed and is making sounds that hard drives shouldn't make.

Do I have to match the exact specs on a replacement?  What options do I have?  The basic specs on the drive are Seagate 18 GB, 15K rpm, 68 pin SCSI Ultra320 68 pin, 8 MB Cache.  Looking at Newegg, there only seems to be Fujitsu replacement drives that match these specs.

This is the link to the drives currently in service.  http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&DEPA=0&Order=BESTMATCH&Description=st318453lw&x=0&y=0

Other related hardware in the server is:
Assembly, Cable, SCSI (SMALL COMPUTER SYSTEMS INTERFACE)..., 68P, 4Drop, 37inch
Card, Controller, PowerEdge Expandable Raid Controller Number 4-Single Channel, U320...
LazNBlazAsked:
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Lee W, MVPTechnology and Business Process AdvisorCommented:
The drive does not NEED to match the specs - however, getting a lesser drive will result in the RAID performance degrading to the level of the slowest drive.  The only CRITICAL requirement is to get a drive AT LEAST as big.  Keep in mind, drives of the same supposed size can vary slightly - if you get a drive that is smaller, even by a few bytes, it won't work in your array.  A larger drive will work fine.
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