voici un tuto presque complet ayant trait à la question :
http://www.dmesg.fr/gestion-hardware/144-optimiser-un-disque-dur-ssd-sous-debian-linux-mint-ubuntu-et-derives
https://wiki.debian.org/SSDOptimization
/* devices that don't properly handle queued TRIM commands */
{ "Samsung SSD 8*", NULL, ATA_HORKAGE_NO_NCQ_TRIM |
ATA_HORKAGE_ZERO_AFTER_TRIM, },