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- From: kinsell@hpfcso.FC.HP.COM (Dave Kinsell)
- Date: Fri, 1 Jan 1993 22:23:51 GMT
- Subject: Re: How does 'mediainit -G' (guru mode :-) work?
- Message-ID: <7371510@hpfcso.FC.HP.COM>
- Organization: Hewlett-Packard, Fort Collins, CO, USA
- Path: sparky!uunet!usc!sdd.hp.com!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!hplextra!hpfcso!kinsell
- Newsgroups: comp.sys.hp
- References: <sean.724574678@coombs>
- Lines: 64
-
-
- from Sean Batt:
-
- >Then there's a bug. In the disc firmware? In the HP controler? In
- >HPUX? If the disc works on Suns, IBMs, Macs, etc, won't HP be
- >interested in the problem?
-
- We'd be interested in cases where the someone did a credible job of
- troubleshooting the problem and actually determined the root cause, and
- then were able to document a violation on the part of the HP supplied
- equipment. Unfortunately, what we tend to hear about are people who
- are having problems with peripherals they've added, and just absolutely
- *know* it couldn't _possibly_ be caused by their peripheral. They're
- able to determine more with gut feeling and instinct than what other
- people can determine in weeks sweating over a logic analyzer.
-
-
-
- >>A good starting point is to carefully read the disk's documentation.
-
- >A starting point for WHAT? I just want to re-low-level-format a disc.
-
- There's no standardization among drives in what sector sizes they support.
- It really would be a good idea to have the documentation available.
- Most modern drives don't allow anything but the 512 byte sectors supplied
- as default. Let's see, last time I said that, some really knowledgeable
- person posted a list filled with 660 meg 5.25" drives to "prove" that I
- was wrong.
-
-
- >Really, the drive's manufacturer has done enough.
-
- Huh? Sold you a bare drive with no documentation, no utilities, no nothing?
-
-
-
- from Hellmuth Michaelis:
- >Isn't it true, that a larger physical sector size gives you
- >
- > - better i/o throughput (if the driver supports it)
-
- It won't be anything significant, unless you have really crummy algorithms
- in the disk controller.
-
-
-
- from Mike Peterson:
- >I don't have the figures in front of me, but as I recall, a Fujistsu
- >2 GB disk will format to give about 1.6 MB with 512 byte sectors,
- >and 1.75 MB with 1024 byte sectors. After 2048 byte sectors, the
- >disk size is pretty constant, then starts to decline again above
- >8096 byte sectors. I don't have any idea why people still use 512
- >byte sectors unless their vendor forces them to -
-
- How about if you have applications that stop working due to raw disk
- access that needs to do have smaller sectors? Or, how about if you're
- nervous that non-default sector sizes aren't QA'ed very thoroughly by
- disk vendors? Or, how about people who want to use drives from different
- vendors interchangeably, and changing the sector sizes makes the drives
- somewhat different? Or, how about people who understand that the
- uncorrectable error rate gets worse as more bits are spanned in a sector?
-
- -Dave Kinsell
- kinsell@hpfcmb.fc.hp.com
-