Question Why doesn't my 2.5 HDD spin when plugged directly to 5V, whereas if plugged with adapter it works fine?

Sep 2, 2022
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i have a cheap laptop that i have been working on, testing different things, and i came across this problem.

It has integrated storage (emmc) and a sata port (unused). i found which cables were 5v, groud, a+,a-,b+,b-, and soldered them to a female sata and power conector. When i boot the laptop, it does not detect the hard drive and it does not start spinning. i also tried with an ssd and neither of them worked. sorry for my bad english, i’m from argentina.
 

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