Bien que la plupart d’entre nous n’aient pas besoin de transporter nos disques durs externes partout où nous allons, certaines personnes peuvent avoir besoin de les transporter partout où ils se rendent. Dans cet esprit, des différences de température notables peuvent-elles avoir un impact négatif sur ces disques durs? L’article d’aujourd’hui du SuperUser Q & R répond aux questions d’un lecteur inquiet.
La séance de questions et réponses d’aujourd’hui nous est offerte par SuperUser, une sous-division de Stack Exchange, un groupe de sites Web de questions-réponses dirigé par la communauté.
Photo gracieuseté de Gillware Data Recovery (YouTube).
La question
SuperUser Reader Misha256 veut savoir si les disques durs externes USB sont exposés à la condensation interne:
Apparently, you can kill a USB hard-drive by moving it from a cold temperature environment to a warm one and powering it up (the killer being internal condensation).
How real is the risk? What kind of temperatures are we talking about? I do not want to waste time acclimatizing my hard-drive every day if it is not necessary. Are there technologies or solutions available to mitigate the risk?
Surprisingly, I have found nothing useful on the Internet that provides satisfactory answers to my questions.
Les disques durs USB externes sont-ils exposés à la condensation interne?
La réponse
Le contributeur SuperUser, harrymc, a la solution pour nous:
Condensation is a real danger for hard-drives. You can see in a real-life YouTube demonstration by a data-recovery specialist what a hard-drive looks like when taken out of a freezer and briefly turned on (it is full of scratches):
Such scratches could possibly damage the hard-drive to a point where even a data-recovery specialist would be unable to recover the data. A Control Data (later Seagate) factory packaging manual for hard-drives says:
If you have just received or removed this unit from a climate with temperatures at or below 50°F (10°C), do not open this container until the following conditions are met, otherwise condensation could occur and damage to the device and/or media may result. Place this package in the operating environment for the time duration according to the following temperature chart.
It seems that dangerously low temperatures start when a computer is brought in from temperatures below 50°F (10°C) into a room-temperature area and it may need several hours for acclimatization. This long time is explained by the fact that in a mechanical hard-drive, the head is supported by airflow entering through special air-intakes. These intakes are heavily filtered against dust, but not against humidity. They are also small enough that it slows down the evaporation process of internal humidity.
You could possibly minimize the acclimatization time by wrapping the disk in watertight plastic while it is acclimatizing in order to reduce the humidity that would enter via the air-intakes. You should allow for some drying-off time after unwrapping the disk (for the humidity in the air already contained inside the disk).
This is not the only danger, as explained by data-recovery specialist ReWave Recovery:
A hard-drive is at risk for sudden temperature changes including overheating and condensation.
A sudden change in temperature that causes condensation inside the hard-drive can cause the material on the platter to evaporate which causes the read/write heads to stick to the platter and stop it from rotating.
Overheating can also be an issue. Overheating can cause the platters to expand which makes the read/write heads travel farther to read the data. The expansion of platters can cause friction which can lead to a head crash.
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