Hard drive speed low only when booting from it

joediesel

Commendable
Sep 11, 2017
4
1
1,515
Dear All,

Since I felt that my windows 10 system wasn´t performing at its max, I decided to check the speed of the 3 drives in my machine with HD Tune. What I found out was that the system drive´s speed is around 2-5 mb/s. which of course is unacceptable.
So I decided to clone that system on to another drive, and booted from that instead.
Result with the new drive: Same - very slow!
Result with the old drive: Now the readings look good, 140-150 mb/s.
Booting from the old drive afterwards made it again show as very slow, whereas the new drive would show normal reading speed (>100 mb/s).
I´m not changing any cables and not changing the SATA port they´re connected to, just changing the drive/partition being booted from in a menu created using EasyBCD.

What on earth can be causing this, and what can be done to resolve it?

Thanks!

PS: Given the nature of the problem, I´m assuming there´s no need to post a bunch of details about hard drive models etc. Correct me if I´m wrong.
 
Never was dissatisfied with HDD speed; this problem is about that something during bootup seems to bottleneck the system drive, but only when its the system drive. May even be that the same thing would happen with an SSD.