Question Why my HDD has slow read/write speeds?

Sep 16, 2020
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My laptop's HDD has been slow for a while, I had it since 2016.
I ran many tests with CrsytalDiskMark and it shows around 30 - 60 MB/s for reading and writing speeds, even after defrag it.
I've checked many times with many methods and basically HDD is at full health. No physical damages either.

So I've replaced this drive for an SSD and tested it and its ok, it shows around the 500 MB/s speeds it supposed to have. So no issues from laptop.

Then I turned the HDD as an external drive and formatted it, basically no files and I ran the test again and still shows me 30MB/s reading speed.

Does anybody know why my HDD made slow?
 

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