Rieder Michael <mr <at> student.ethz.ch> writes: > hdparm -I says the drive supports TRIM and does "Deterministic read after TRIM" which I interpret to mean > that if the data was really discarded, the drive should return zeros (or something else) but not the > previous data. > OK I found out what's wrong. There's a difference between "Deterministic read data after TRIM" (word 69 bit 14) and "Deterministic read ZEROs after TRIM" (bit 5). My drive (OCZ Agility 3) uses only deterministic read, but that only means a trimmed block always returns the same result until the next write command. So the testing procedure described on many Linux resources on the web is not valid for all SSD drives actually... -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
