It applies to any hard drive.
They all operate the same way and are subject to the same laws of physics. The only difference is size.
Okay the other day I screwed my carpc case down not thinking at the time. After the fact I realized that the carpc was slopped in a 45 degree angle. I've read a few things about hard drives having to be either completely flat or completely vertical. I'm using a laptop hard drive though and was wondering if the same applies for a laptop hd?
The old (I mean first generation drives) needed to be formatted in the orientation they would be used in. They had very large physical platters back then.... Modern drives are much, much smaller.
Drives have not had that limitation for many years. I would not hesitate to put a HD in a car in any orientation.
Edit: DP is right, same physics regardless of size. But a platter the size of a serving plate can flex more than a the 3.5 inch HD from a desk top. Additionally the materials science has improved as well.
D201GLY2, DC-DC power, 3.5 inch SATA
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