Re: Screeching fan in Ultra 31310 ext HD enclosure; IBM DTLA 307030 HD info; preferred enclosures.
- From: Nicholas Bodley <n_bod_ley@xxxxxxxxxxxxx>
- Date: Tue, 21 Jul 2009 05:11:29 -0500
On Mon, 20 Jul 2009 12:43:48 -0400, Wild_Bill wrote:
[...] I think I saw some info stating that Hitachi was manufacturing
the IBM drives even when they were labeled as IBM products.
That seems to agree with what I barely remember.
There is a specific term used for that worn condition in bearings, when
they start making a low frequency growling noise, but I don't remember
the term. I think the chatter or rattle may be a result of the shaft
trying to ride around the inner cirumference of the bearing, instead of
just rotating on it's axis.
That's what I was trying to describe. The shaft doesn't slip inside the
bearing totally, as it normally does; at least partially, it wobbles
violently because it doesn't slip. My kitchen exhaust fan also screeches
on startup.
I don't recall seeing any of the small motors (approx 2" or less) that
don't fail within a short time,
I s.t.r. some good small CPU cooling fans that did last a while, but am
not sure.
Let's face it, those small fans don't move much air anyway, certainly
not enough to provide an adequate amount of air over and around a HDD
for sufficient cooling.
In my Ultra enclosure, not a lot of air moves, but simply replacing the
warm air inside the box is better than none. If the drive needs
relatively-fast-moving air, indeed, these enclosures are not promising.
The Venus is much better, though.
About the overly bright LEDs.. I dislike the distraction of a bright
light source just to let me know that something is powered on. I'm
usually fully aware of what equipment I have turned on, particularly
when I'm using that equipment.
One could add a higher value resistor in series with the LED, but I
usually jut put some black tape with a tiny hole in it, or paper label
with black ink over the LED.
I realized that I don't have anything remotely close to surface-mount
soldering equipment right now, and of course the series resistors are s.m.
I think you were referring to a Venus external drive case with a decent
cooling fan.
True, but one for a single drive.
It worked smoothly as an external storage device.
Not at all surprising.
I really hope they survive the downturn.
Btw, the fan in the single-drive case is quite thin -- think "pancake",
yet it's axial-flow.
Regards,
--
Nicabod =+= Waltham, Mass.
.
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