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- Path: sparky!uunet!gatech!udel!wupost!psuvax1!rutgers!uwvax!zazen!doug.cae.wisc.edu!keiths
- From: keiths@cae.wisc.edu (Keith Scidmore)
- Newsgroups: comp.sys.ibm.pc.hardware
- Subject: Re: SCSI hard drive question
- Message-ID: <1992Dec28.214705.9575@doug.cae.wisc.edu>
- Date: 29 Dec 92 03:47:05 GMT
- References: <1992Dec28.225259.116673@zeus.calpoly.edu> <1992Dec28.230052.124433@zeus.calpoly.edu>
- Distribution: usa
- Organization: College of Engineering, Univ. of Wisconsin--Madison
- Lines: 20
-
- In article <1992Dec28.230052.124433@zeus.calpoly.edu> jowalker@zeus.calpoly.edu (Jonathan Walker) writes:
- >Can anyone explain the advantages of a SCSI drive and controller over an
- >IDE drive and controller?
- >I have read that they actually perform worse than IDE drives. Is the
- >only advantage that you can link numerous SCSI devices together?
- >
- There is no reason to use SCSI on your average stand-alone system. If
- what you want is a file server or you have some special application then
- SCSI may make some sense. The fact of the matter is that even a lowly ISA
- bus has more bandwidth than evn the fastest hard drives. Unfortunately,
- many people confuse the external transfer rate of a hard drive (from its
- buffer or "cache" as some call it) with the internal transfer rate. If you
- pay $50/MB for some additional memory and run a software cache you won't
- be constrained to the bus speeds, you'll save money, and have a system
- that will blow the doors of the bus bandwidth limited SCSI controllers you
- can buy for hundreds more. Bus mastering is only useful if you have more
- than one device that wants to do work while the other is master on the
- bus. Few stand-alone systems can exploit this advantage.
-
- Keith
-