Karl Voit 
michie164@publicvoit
Da spekuliere ich nur, ein Elektronischer Bauteil ist normalerweise versiegelt.
Elko, Widerstände, Akku usw. da kann ich mir schon vorstellen das es die bei unterschiedlichen, zu wenig oder zu viel Druck undicht werden.
@michie164 Ja. Allerdings dann hätte ich aber auch erwartet, dass Aufgabegepäck im Flieger auch im ausgeschalteten Zustand ein No-Go wäre, was allerdings nicht im Manual steht.
Landa 
@publicvoit Kabinendruck wird im Reiseflug normalerweise auf den üblichen Druck zwischen 2000 und 3000m Höhe nivelliert (bei mehr Druck müsste der Rumpf stabiler gebaut werden, bei weniger würden Passagiere Höhenkrankheit erleiden).
Das würde zu den Grenzwerten für die Lenovo Notebooks passen.
@michie164
Das würde zu den Grenzwerten für die Lenovo Notebooks passen.
@michie164
@publicvoit
Ja, das hast du auch recht, allerdings wird im Flieger ein Druck erzeugt. Weiß nicht, wie viel, aber möglicherweise reicht das?
Einer meiner früheren Arbeitgeber hat mal gesagt, Computer brauchen ähnliche Umgebung wie Menschen.
Ja, das hast du auch recht, allerdings wird im Flieger ein Druck erzeugt. Weiß nicht, wie viel, aber möglicherweise reicht das?
Einer meiner früheren Arbeitgeber hat mal gesagt, Computer brauchen ähnliche Umgebung wie Menschen.
DianeI'm guessing here:
I have seen a small hole marked "do not cover" that I think leads to bladder on hard disks to help equalize pressure. I could imagine this system is intended to keep the hard disk case from flexing and can only handle so much change in pressure.
It might be interesting to look up your laptops hard disk model and see if it specifies a maximum altitude.
@alienghic I guess meanwhile, there is almost no laptop which contains a hard disk. Just SSDs mostly in form of NVMe/M.2.
So this should not be any issue any more.
There's a bunch of people using older hardware around here, and i'm not sure how new that was.
I's guess there's some other sealed component not rated for low pressure.
I don't know what it is though.
My next guess was battery, and searching for lithium ion altitude did turn up sites that claim typical maximum altitudes for common batteries is 3000-4000 meters
@alienghic Yes, that's a good one as it affects all model variants in the same way.
Interesting. Didn't know that there's a max altitude for batteries.
In Austria, you can take roads up to 2500m+ using electric cars ... 🤔
I know some electric car battery packs have active heating and cooling systems and also tend to be in sealed metal boxes, either of which might help counter the problems altitude is causing for the battery chemistry.
Daniel Schildt@alienghic @publicvoit Car battery technology is also getting improved because a lot of Chinese countryside is on regions surrounded by mountains. If they want to increase the amount of people using electric cars, the amount of maximum vertical height from the sea level has to improve.
Bitslingers-R-Us@alienghic @publicvoit Yes, that hole is so there's no pressure difference between outside and inside of a hard drive.
Disk heads use the Bernoulli principle to keep the heads from touching the disks. If the air is too thin, then even small jolts might cause the heads to hit the disks, or if it's thin enough, this won't work at all.
Even with solid state disks, there are issues with electronics above certain altitudes. The lack of pressure can cause battery cells to expand, for instance. Another issue is heat dissipation. If you have an Intel laptop with a CPU that's putting out 90 watts worth of heat, thin air at high altitudes isn't going to cool that nearly as well and you're going to have much more throttling (or crashing, as some Intel CPUs are wont to do).
Disk heads use the Bernoulli principle to keep the heads from touching the disks. If the air is too thin, then even small jolts might cause the heads to hit the disks, or if it's thin enough, this won't work at all.
Even with solid state disks, there are issues with electronics above certain altitudes. The lack of pressure can cause battery cells to expand, for instance. Another issue is heat dissipation. If you have an Intel laptop with a CPU that's putting out 90 watts worth of heat, thin air at high altitudes isn't going to cool that nearly as well and you're going to have much more throttling (or crashing, as some Intel CPUs are wont to do).
Jo:rg Weingrill@publicvoit Abgesehen von Festplatten ist die Kühlleistung von Lüftern in großer Höhe vermindert.
@weingrill Good point.
Allerdings hätte ich hier erwartet, dass die Höhen-Werte für die starken CPU-Varianten tiefer sind als für die schwachen CPU-Varianten. Ist auch nicht der Fall. 🤷
Vielleicht ist's ja aus Faulheit nur für die stärkste Variante durchgerechnet?
Lett Osprey 
🍉 
@publicvoit how often do you get above these altitude for computer work? Many human can struggle at that height, so I assume it wouldn't be that common?
@lettosprey Oh, I may take my notebook with me in case I need to work during breaks while skiing. Or I may work for a company that's maintaining infrastructure in those heights (lifts, buildings, ...). I can think of many reasons to do so.
How often is not an argument if the hardware might be damaged on its first use above that height limit.
In my life time, I was at similar altitudes multiple times. And I'm not even going for hiking that often.
@publicvoit I guess "how often" is an argument for companies making regular computer equipment.
If most people rarely ever use a computer over these altitudes, I do not see the limit as rather low. Wiki mention something about 40% frequency of altitude illness over those heights, so I guess lenovo could feel the limit is ok.
Most skiing resorts in Australia are below this altitude.
For people with more "extreme" needs, there is equiment build to handle that, but why do that for everyone if it adds cost?
@lettosprey Well, it's the business series by lenovo, being proud of having a more robust nature including some certificates in that directory.
Maybe I'm just surprised to learn that it takes special equipment for that altitudes. 🤷
@publicvoit Having used a top end business series lenovo for about half a year now (work provides...), I feel mostly just happy if I am able to get it through a workday without it causing too much hassle for me.
Ernesto Rico Schmidt@publicvoit I would guess that with the increasing density of the chips and specialty the CPUs, it becomes tricky to operate and avoid crosstalk and similar things at this altitude.
With higher altitude the air pressure is lower and the “safe” distance for integrated circuits becomes bigger.
Thomas Aglassinger@publicvoit #Lenovo offers different products for different audiences at different prices. The #Thinkpad series supports MIL-STD 810G and works up to 4500m (15.000ft).
@roskakori Well, the x13 ThinkPads do have different max. altitudes. 🤷
@publicvoit I see, so the x13 is a Thinkpad. Then I suppose you have to decide on the features that are important to you beforehand, and then check before you buy. Sadly, it seems you can't just rely on the model name.