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Date:	Tue, 26 Feb 2002 10:03:01 PST7
From:	"J. R. Fox" <jr_fox@pacbell.net >
Reply-To:	scoug-help@scoug.com
To:	scoug-help@scoug.com
Subject:	SCOUG-Help: Re: Drive Noise

Content Type: text/plain

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Peter wrote:

> I've heard that the 7200rpm and 10,000rpm drives make
> their noise at a high frequency so the result is an audible "whine"
> which some people find annoying. (For techies: dBA is the likely
> unit.)

Yeah, that's about right. My previous hard drives were 5400 and then 7200 r.p.m. (Quantum Atlas -- not
mentioned on the "good drive / bad drive" list -- and they were reliable for me); the ones I've been
running for the last couple years are IBM UltraStar 10,000 r.p.m. (All of these have been SCSI.) The
10K's sound are more noticeable, and at a higher pitch. How much this bothers you is an individual
thing. Personally, I like my work area to be as quiet as possible, the better to concentrate. I had part
of my case lined with Sonex foam, to reduce this noise, and it did help some. If I had it to do over, I'd
probably line the case with it everywhere possible. (It was outrageously expensive at the time, but the
price on this material has come down sharply.)

> IBM gives a shock spec. In the old days an earthquake could really zap
> your spinning drive, but IBM says their drive can absorb 55G while
> spinning or 400G while stopped. I don't think my house will take that
> much. Can any physicist out there tell me how far I would have to drop
> my house to get a 55G (or 400G) impact?

The old PLUS HardCard was probably the first hard drive (that I know of) to have a really effective shock
rating. They could and did go through some moderate earthquakes, quite unfazed. In more recent years of
h/d design, I guess this is no longer much of an issue.

Jordan

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