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- Path: odo.PEAK.ORG!not-for-mail
- From: ridgwad@PEAK.ORG (Dean Ridgway)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: SCSI vs. EIDE
- Date: 19 Jan 1996 13:26:18 -0800
- Organization: CS Outreach Services, Oregon State University, Corvallis, OR, USA
- Message-ID: <4dp29q$i01@PEAK.ORG>
- References: <321.6587T200T2624@Th0r.foo.bar> <1026.6590T1022T1189@in.net>
- NNTP-Posting-Host: peak.org
-
- In article <1026.6590T1022T1189@in.net>,
- John J. Maver, Jr. <mave@in.net> wrote:
-
- > The advantage that SCSI still has is its ability to handle multiple
- >devices. IDE is limited to, I think, two. Whereas scsi can handle lots.
-
- EIDE can (supposedly) handle up to 4 devices. I've never seen it done
- successfully though.
-
- The big difference between the two is smarts. Say you have a hard drive
- that has 1000 physical tracks. Say you are developing a program and as a
- consequence of a bug it accidentally orders the hard drive controller to
- seek to track 10000. A SCSI drive will tell the controller "I can't do
- that", set and error code and exit. The IDE drive will say "ok" and
- (attempt to) send the head out to track 10000, possibly damaging the drive.
-
- Many of the local computer stores around here *WILL NOT* sell you an IDE
- drive unless *THEY* can install it and set it up. I asked them about
- this and they told me that they were getting too many returns of blown
- drives from clueless users that told the system they had bigger drives
- then they actually did (or otherwise bungled the drive geometry).
-
- IDE is really a stickler for drive geometry, it *HAS* to know how the
- drive is physically laid out. OTOH SCSI converts every read/write
- request to logical blocks and could care less about how many physical
- heads, surfaces, blocks per track etc. the drive has.
-
- /\-/\ Dean Ridgway | Two roads diverged in a wood, and I-
- ( - - ) InterNet ridgwad@peak.org | I took the one less traveled by,
- =\_v_/= FidoNet 1:357/1.103 | And that has made all the difference.
- CIS 73225,512 | "The Road Not Taken" - Robert Frost.
- http://www.peak.org/~ridgwad/
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