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- Subject: Re: HELP: Testing a Quantum SCSI harddisk.
- Date: 2 Apr 1996 01:57:30 GMT
- Organization: IBM Almaden Research Center
- Distribution: World
- Message-ID: <4jq1ia$nuu@fox.almaden.ibm.com>
- References: <50077815@wbmt41.wbmt.tudelft.nl> <4jnrts$qum@gazette.engr.sgi.com>
- Reply-To: triblet@almaden.ibm.com
- NNTP-Posting-Host: triblet2.almaden.ibm.com
- X-Newsreader: IBM NewsReader/2 v1.2.5
-
- In <4jnrts$qum@gazette.engr.sgi.com>, olson@anchor.engr.sgi.com (Dave Olson) writes:
- >Don't pay them for it. A surface test won't tell you anything about
- >firmware or hardware timing problems that might show up on a different
- >type of system. I'd say that they aren't very aware of scsi issues,
- >if you described the problems to them this way, and they performed
- >a surface test.
-
- I agree that a surface test was the wrong thing to do. This sounds like a SCSI bus
- problem, not a surface problem. Furthermore, if they didn't find any defects,
- they didn't run the test right. Modern drives ALL have defects found at the
- factory, but new defects after that are rare. The microcode hides all the old
- defects from the PC, and will try real hard to hide new defects (if the microcode
- has trouble reading from a given sector, but can eventually read sucessfully,
- it can spare out the sector, and the PC will never know. The PC only finds about
- it about if:
-
- - The data cannot be sucessfully read after the microcode trys lots of tricks
-
- - or the PC pgm is smart enough to read the defect tables.
-
-
- Chuck Tribolet
- San Jose, CA
-
- Silicon Valley - best day job in the world
-