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AHCI - Advanced Host Controller Interface is a standard for disk drives and controllers. Enabling AHCI in the BIOS can give a 5-15% performance increase. Not all controllers offer AHCI.For [[Solid State Computer Systems]] most SSD models support a feature called TRIM. TRIM is just a status update that triggers when the filesystem deletes a block, it also notifies the device that the block is no longer in use. The SSD firmware can then do some wear leveling functions. Without TRIM, it would not be able to tell whether that block was still in use. TRIM does not require AHCI. == Some Commands ==== Partition a SSD for FreeBSD ==Applies to [[Solid State Computer Systems]] with FreeBSD 10.X and newer.Do not enable TRIM unless the SSD supports it. Better yet, avoid SSDs that do not support TRIM.Create the partition scheme. In the GPT partition scheme make a boot partition of the size 512K. Here we will use the new 4K-alignment which is what is advised for SSD drives. More information is on [[Hard Drive Logical Block Format Migration to 4K- Alignment]]. gpart create -s gpt ada0 gpart add -t freebsd-boot -s 512k -a4k -l ssdboot ada0 gpart bootcode -b /boot/pmbr -p /boot/gptboot -i1 ada0