1. Hardware. Samsung SSD UM410 Series. ATA. BIOS: AHCI not enabled (doesn't exist) because mb is ATA and AHCI is an SATA interface. This is a 5 year old 8 GB ssd, one of the earliest ones, never been TRIM'd. When I do:
sudo hdparm -I /dev/sda
I see no mention made of TRIM under capabilities/features. I do see Mandatory FLUSH_CACHE. Could this be an automated TRIM-like function?
2. Samsung website states that TRIM is supported in all ssd's.
3. ext4 file system and latest kernal (14.04)
sudo gedit /etc/fstab
my edit looks like:
UUID=35921f6f-4508-4678-87ae-16bf1c993244 / ext4 noatime,nodiratime,discard,errors=remount-ro 0 1
Somebody said that the "discard" flag should be "allow-discards" The result of this edit was kernel panic and I had to re-edit fstab with nano from recovery.
5. After I run:
FITRIM ioctl failed: Operation not supported.
I'm stuck. Suggestions?