AHCI is configured through BIOS under the options for SATA/IDE etc.
Whereas TRIM is native to the Solid State Drive based on the technology used or the firmware present controlling the device. TRIM is an automated process, and the majority of production SSDs now natively support the technology, as well as garbage collection establishment.
So when you see less capacity shown in contrast to the drive’s size, this simply means it is “reserved” area for proper functionality.
The majority of RAID configurations eliminate both features, as they are operating under different instruction via the stripe.
Simply put, your only concern will be configuring the SATA operation as AHCI via BIOS. All this really means is the allowance for higher level drive control through commands. This proves useful in troubleshooting at an advanced level…if so desired.
Also, perhaps the guide you were referring to was the one I had published using command prompt issued commands, and Windows optimizations? You can locate it at the link below, you may find some useful procedures for the future.
Link to my SSD thread:
http://www.trubritar...orage-tutorial/
-Hooks