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If your SSD was previously accelerated and you installed new operating system without disabling acceleration, it may be a possibility that some metadata is still stored on the SSD.
In order to enable acceleration again, you will need the disk set as unallocated.
Hi, thank you for your reply. I haven't installed a new operating system, that's the original provided with the laptop. But I found a software preinstalled called "ExpressCache": is it possible that this software manages my SSD instead of Intel Rapid Storage?
I recommend contacting your computer manufacturer as they are familiar with the bundled software available for your computer model.