The speed of my sdssdx120gg25 disk greatly decreased .
I Motherboard MSI Z77-GD65
AHCI - enable
Windows 7 x64 SP1
This computer disk works a year and worked in the previous half year .
Earlier in the test Windows 7.9 units for the drive on the old and new computer.
But now the rate has dropped substantially , slow .
What is unclear delay.
TRIM function tested - works .
The disc is full is not much , even specially cut a piece of 20 GB and leave it unformatted .
Big Air - this is the current computer on test .
In PASSMARK8 #4840(my old PC) worth the same disc - years ago.
and #4834 (my now PC whith HDD on test)
I do not understand how to restore the disk , please help me.