Today's Message Index:
----------------------
1. 11:14 AM - Re: Re: Laptop supply for your car/airplane (Scott R. Shook)
2. 12:03 PM - Re: Re: Laptop supply for your car/airplane (Robert L. Nuckolls, III)
3. 12:17 PM - Re: Re: Laptop supply for your car/airplane (Tim Olson)
4. 12:41 PM - Re: Re: Laptop supply for your car/airplane ()
Message 1
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Subject: | Re: Laptop supply for your car/airplane |
Actually hard drives are sealed units (air-tight). They are built in clean
rooms to exacting standards. The only thing that altitude will do is change
the air pressure outside causing strain on casing of the hard drive.
I have completely recovered data off of hard drives that were completely
immersed in floodwaters. Once a roof collapsed and flooded a data center -
the hard drives were removed from the servers, dried out, placed in fresh
servers, and spun right up.
Scott R. Shook
RV-7A (Building)
N696JS (Reserved)
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Eric M.
Jones
Sent: Sunday, October 17, 2010 06:18
Subject: AeroElectric-List: Re: Laptop supply for your car/airplane
<emjones@charter.net>
Remember that anything using a hard drive depends on a little cushion of air
between the read-write head and the disk. Using a HD above 10,000 feet cabin
pressure is risky.
Apple, Maxtor and Seagate state 10,000 feet as the maximum operating
altitude. Don't forget those IPods.
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones@charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=316027#316027
Message 2
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Subject: | Re: Laptop supply for your car/airplane |
At 01:10 PM 10/19/2010, you wrote:
Actually hard drives are sealed units (air-tight). They are built in clean
rooms to exacting standards. The only thing that altitude will do is change
the air pressure outside causing strain on casing of the hard drive.
I have completely recovered data off of hard drives that were completely
immersed in floodwaters. Once a roof collapsed and flooded a data center -
the hard drives were removed from the servers, dried out, placed in fresh
servers, and spun right up.
Hmmmm . . . I can see that a drive might be liquid tight
for low pressure heads but they're not well 'sealed'
Emacs!
Looking at the spacing between cover screws that hold
a thin sheet metal cover down against a gasket does not
suggest any ability to keep the drive interior from
exhausting at altitude. I've had one experience with
a data gathering task where I put my laptop in
the tail of a Beechjet. The intent was to stay below
10K feet. I had other equipment in the passenger
cabin too. During the flight, it was determined
that we needed to go up in altitude. Putting a
new hard drive in my laptop was a whole lot cheaper
than the cost of fuel and $time$ to land and
recover the un-protected computer.
After the flight, the hard drive was trashed
and could not be recovered. I seem to recall
foam-plugged vent holes in hard drives that
I've taken apart . . . but examination of
the WD and Maxtors laying around right now
failed to find one without tearing it apart.
This teardown article speaks to an on-purpose
hard drive vent.
http://www.pcdoctor-guide.com/wordpress/?p=595
Bob . . .
Message 3
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Subject: | Re: Laptop supply for your car/airplane |
Definitely not true. They aren't sealed 100%, they have vents,
and over 10K' definitely does kill them. I had a couple
that wouldn't operate at 13K' one day. Switched to
SSD's because that's what you need over 10K. Yes,
sometimes it'll be fine, but sometimes it won't. And it
CAN damage the drive because the heads need to float on a
cushion of air, and even if it works, the cushion will
be less at altitude.
Air permeates the vents, even if water stays out
reasonably well.
Tim
On 10/19/2010 1:10 PM, Scott R. Shook wrote:
> --> AeroElectric-List message posted by: "Scott R. Shook"<scott@n696js.com>
>
> Actually hard drives are sealed units (air-tight). They are built in clean
> rooms to exacting standards. The only thing that altitude will do is change
> the air pressure outside causing strain on casing of the hard drive.
>
> I have completely recovered data off of hard drives that were completely
> immersed in floodwaters. Once a roof collapsed and flooded a data center -
> the hard drives were removed from the servers, dried out, placed in fresh
> servers, and spun right up.
>
>
> Scott R. Shook
> RV-7A (Building)
> N696JS (Reserved)
>
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
> [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Eric M.
> Jones
> Sent: Sunday, October 17, 2010 06:18
> To: aeroelectric-list@matronics.com
> Subject: AeroElectric-List: Re: Laptop supply for your car/airplane
>
> --> AeroElectric-List message posted by: "Eric M. Jones"
> <emjones@charter.net>
>
> Remember that anything using a hard drive depends on a little cushion of air
> between the read-write head and the disk. Using a HD above 10,000 feet cabin
> pressure is risky.
>
> Apple, Maxtor and Seagate state 10,000 feet as the maximum operating
> altitude. Don't forget those IPods.
>
> --------
> Eric M. Jones
> www.PerihelionDesign.com
> 113 Brentwood Drive
> Southbridge, MA 01550
> (508) 764-2072
> emjones@charter.net
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=316027#316027
>
>
Message 4
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Subject: | Re: Laptop supply for your car/airplane |
I understand solid state drives do not suffer the same demise. Where I
live on the east coast 10k in light airplanes is a bit like going to the
moon, so not really a factor over here. Take a good backup before you
leave.
Do not archive
Glenn E. Long
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Tim
Olson
Sent: Tuesday, October 19, 2010 3:13 PM
Subject: Re: AeroElectric-List: Re: Laptop supply for your car/airplane
Definitely not true. They aren't sealed 100%, they have vents,
and over 10K' definitely does kill them. I had a couple
that wouldn't operate at 13K' one day. Switched to
SSD's because that's what you need over 10K. Yes,
sometimes it'll be fine, but sometimes it won't. And it
CAN damage the drive because the heads need to float on a
cushion of air, and even if it works, the cushion will
be less at altitude.
Air permeates the vents, even if water stays out
reasonably well.
Tim
On 10/19/2010 1:10 PM, Scott R. Shook wrote:
> --> AeroElectric-List message posted by: "Scott R.
Shook"<scott@n696js.com>
>
> Actually hard drives are sealed units (air-tight). They are built in
clean
> rooms to exacting standards. The only thing that altitude will do is
change
> the air pressure outside causing strain on casing of the hard drive.
>
> I have completely recovered data off of hard drives that were
completely
> immersed in floodwaters. Once a roof collapsed and flooded a data
center -
> the hard drives were removed from the servers, dried out, placed in
fresh
> servers, and spun right up.
>
>
> Scott R. Shook
> RV-7A (Building)
> N696JS (Reserved)
>
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
> [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Eric M.
> Jones
> Sent: Sunday, October 17, 2010 06:18
> To: aeroelectric-list@matronics.com
> Subject: AeroElectric-List: Re: Laptop supply for your car/airplane
>
> --> AeroElectric-List message posted by: "Eric M. Jones"
> <emjones@charter.net>
>
> Remember that anything using a hard drive depends on a little cushion
of air
> between the read-write head and the disk. Using a HD above 10,000 feet
cabin
> pressure is risky.
>
> Apple, Maxtor and Seagate state 10,000 feet as the maximum operating
> altitude. Don't forget those IPods.
>
> --------
> Eric M. Jones
> www.PerihelionDesign.com
> 113 Brentwood Drive
> Southbridge, MA 01550
> (508) 764-2072
> emjones@charter.net
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=316027#316027
>
>
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